Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

69 files changed, 25640 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/win/Makefile.kup b/src/VBox/Runtime/r3/win/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/Makefile.kup
diff --git a/src/VBox/Runtime/r3/win/RTCrStoreCreateSnapshotById-win.cpp b/src/VBox/Runtime/r3/win/RTCrStoreCreateSnapshotById-win.cpp
new file mode 100644
index 00000000..cfae19ec
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTCrStoreCreateSnapshotById-win.cpp
@@ -0,0 +1,169 @@
+/* $Id: RTCrStoreCreateSnapshotById-win.cpp $ */
+/** @file
+ * IPRT - RTCrStoreCreateSnapshotById, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/crypto/store.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/once.h>
+#include <iprt/ldr.h>
+
+#include <iprt/win/windows.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef HCERTSTORE (WINAPI *PFNCERTOPENSTORE)(PCSTR pszStoreProvider, DWORD dwEncodingType, HCRYPTPROV_LEGACY hCryptProv,
+                                              DWORD dwFlags, const void *pvParam);
+typedef BOOL (WINAPI *PFNCERTCLOSESTORE)(HCERTSTORE hCertStore, DWORD dwFlags);
+typedef PCCERT_CONTEXT (WINAPI *PFNCERTENUMCERTIFICATESINSTORE)(HCERTSTORE hCertStore, PCCERT_CONTEXT pPrevCertContext);
+
+
+
+static int rtCrStoreAddCertsFromNative(RTCRSTORE hStore, DWORD fStore, PCRTUTF16 pwszStoreName,
+                                       PFNCERTOPENSTORE pfnOpenStore, PFNCERTCLOSESTORE pfnCloseStore,
+                                       PFNCERTENUMCERTIFICATESINSTORE pfnEnumCerts, int rc, PRTERRINFO pErrInfo)
+{
+    DWORD fOpenStore = CERT_STORE_OPEN_EXISTING_FLAG | CERT_STORE_READONLY_FLAG;
+    HCERTSTORE hNativeStore = pfnOpenStore(CERT_STORE_PROV_SYSTEM_W, PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
+                                           NULL /* hCryptProv = default */, fStore | fOpenStore, pwszStoreName);
+    if (hStore)
+    {
+        PCCERT_CONTEXT pCurCtx = NULL;
+        while ((pCurCtx = pfnEnumCerts(hNativeStore, pCurCtx)) != NULL)
+        {
+            if (pCurCtx->dwCertEncodingType & X509_ASN_ENCODING)
+            {
+                RTERRINFOSTATIC StaticErrInfo;
+                RTASN1CURSORPRIMARY PrimaryCursor;
+                RTAsn1CursorInitPrimary(&PrimaryCursor, pCurCtx->pbCertEncoded, pCurCtx->cbCertEncoded,
+                                        RTErrInfoInitStatic(&StaticErrInfo),
+                                        &g_RTAsn1DefaultAllocator, RTASN1CURSOR_FLAGS_DER, "CurCtx");
+                RTCRX509CERTIFICATE MyCert;
+                int rc2 = RTCrX509Certificate_DecodeAsn1(&PrimaryCursor.Cursor, 0, &MyCert, "Cert");
+                if (RT_SUCCESS(rc2))
+                {
+                    rc2 = RTCrStoreCertAddEncoded(hStore, RTCRCERTCTX_F_ENC_X509_DER | RTCRCERTCTX_F_ADD_IF_NOT_FOUND,
+                                                  pCurCtx->pbCertEncoded, pCurCtx->cbCertEncoded,
+                                                  RTErrInfoInitStatic(&StaticErrInfo));
+                    RTCrX509Certificate_Delete(&MyCert);
+                }
+                if (RT_FAILURE(rc2))
+                {
+                    if (RTErrInfoIsSet(&StaticErrInfo.Core))
+                        RTErrInfoAddF(pErrInfo, -rc2, "  %s", StaticErrInfo.Core.pszMsg);
+                    else
+                        RTErrInfoAddF(pErrInfo, -rc2, "  %Rrc adding cert", rc2);
+                    rc = -rc2;
+                }
+            }
+        }
+        pfnCloseStore(hNativeStore, CERT_CLOSE_STORE_CHECK_FLAG);
+    }
+    else
+    {
+        DWORD uLastErr = GetLastError();
+        if (uLastErr != ERROR_FILE_NOT_FOUND)
+            rc = RTErrInfoAddF(pErrInfo, -RTErrConvertFromWin32(uLastErr),
+                               " CertOpenStore(%#x,'%ls') failed: %u", fStore, pwszStoreName);
+    }
+    return rc;
+}
+
+
+
+RTDECL(int) RTCrStoreCreateSnapshotById(PRTCRSTORE phStore, RTCRSTOREID enmStoreId, PRTERRINFO pErrInfo)
+{
+    AssertReturn(enmStoreId > RTCRSTOREID_INVALID && enmStoreId < RTCRSTOREID_END, VERR_INVALID_PARAMETER);
+
+    /*
+     * Create an empty in-memory store.
+     */
+    RTCRSTORE hStore;
+    int rc = RTCrStoreCreateInMem(&hStore, 128);
+    if (RT_SUCCESS(rc))
+    {
+        *phStore = hStore;
+
+        /*
+         * Resolve the APIs we need to do this job.
+         */
+        RTLDRMOD hLdrMod;
+        int rc2 = RTLdrLoadSystem("crypt32.dll", false /*NoUnload*/, &hLdrMod);
+        if (RT_SUCCESS(rc2))
+        {
+            PFNCERTOPENSTORE                pfnOpenStore  = NULL;
+            rc2 = RTLdrGetSymbol(hLdrMod, "CertOpenStore", (void **)&pfnOpenStore);
+
+            PFNCERTCLOSESTORE               pfnCloseStore = NULL;
+            if (RT_SUCCESS(rc2))
+                rc2 = RTLdrGetSymbol(hLdrMod, "CertCloseStore", (void **)&pfnCloseStore);
+
+            PFNCERTENUMCERTIFICATESINSTORE  pfnEnumCerts  = NULL;
+            if (RT_SUCCESS(rc2))
+                rc2 = RTLdrGetSymbol(hLdrMod, "CertEnumCertificatesInStore", (void **)&pfnEnumCerts);
+            if (RT_SUCCESS(rc2))
+            {
+                /*
+                 * Do the work.
+                 */
+                switch (enmStoreId)
+                {
+                    case RTCRSTOREID_USER_TRUSTED_CAS_AND_CERTIFICATES:
+                    case RTCRSTOREID_SYSTEM_TRUSTED_CAS_AND_CERTIFICATES:
+                    {
+                        DWORD fStore = enmStoreId == RTCRSTOREID_USER_TRUSTED_CAS_AND_CERTIFICATES
+                                     ? CERT_SYSTEM_STORE_CURRENT_USER : CERT_SYSTEM_STORE_LOCAL_MACHINE;
+                        static PCRTUTF16 const s_apwszStores[] =  { L"AuthRoot", L"CA", L"MY", L"Root" };
+                        for (uint32_t i = 0; i < RT_ELEMENTS(s_apwszStores); i++)
+                            rc = rtCrStoreAddCertsFromNative(hStore, fStore, s_apwszStores[i], pfnOpenStore, pfnCloseStore,
+                                                             pfnEnumCerts, rc, pErrInfo);
+                        break;
+                    }
+
+                    default:
+                        AssertFailed(); /* implement me */
+                }
+            }
+            else
+                rc = RTErrInfoSetF(pErrInfo, -rc2, "Error resolving crypt32.dll APIs");
+            RTLdrClose(hLdrMod);
+        }
+        else
+            rc = RTErrInfoSetF(pErrInfo, -rc2, "Error loading crypt32.dll");
+    }
+    else
+        RTErrInfoSet(pErrInfo, rc, "RTCrStoreCreateInMem failed");
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTCrStoreCreateSnapshotById);
+
diff --git a/src/VBox/Runtime/r3/win/RTHandleGetStandard-win.cpp b/src/VBox/Runtime/r3/win/RTHandleGetStandard-win.cpp
new file mode 100644
index 00000000..342e44ba
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTHandleGetStandard-win.cpp
@@ -0,0 +1,126 @@
+/* $Id: RTHandleGetStandard-win.cpp $ */
+/** @file
+ * IPRT - RTHandleGetStandard, Windows.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/iprt.h"
+#include <iprt/handle.h>
+
+#include <iprt/file.h>
+#include <iprt/pipe.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/log.h>
+
+#include <iprt/win/windows.h>
+
+#include "internal/socket.h"            /* (Needs Windows.h.) */
+
+
+RTDECL(int) RTHandleGetStandard(RTHANDLESTD enmStdHandle, PRTHANDLE ph)
+{
+    /*
+     * Validate and convert input.
+     */
+    AssertPtrReturn(ph, VERR_INVALID_POINTER);
+    DWORD dwStdHandle;
+    switch (enmStdHandle)
+    {
+        case RTHANDLESTD_INPUT:  dwStdHandle = STD_INPUT_HANDLE; break;
+        case RTHANDLESTD_OUTPUT: dwStdHandle = STD_OUTPUT_HANDLE; break;
+        case RTHANDLESTD_ERROR:  dwStdHandle = STD_ERROR_HANDLE; break;
+        default:
+            AssertFailedReturn(VERR_INVALID_PARAMETER);
+    }
+
+    /*
+     * Is the requested descriptor valid and which IPRT handle type does it
+     * best map on to?
+     */
+    HANDLE hNative = GetStdHandle(dwStdHandle);
+    if (hNative == INVALID_HANDLE_VALUE)
+        return RTErrConvertFromWin32(GetLastError());
+
+    DWORD dwInfo;
+    if (!GetHandleInformation(hNative, &dwInfo))
+        return RTErrConvertFromWin32(GetLastError());
+    bool const fInherit = RT_BOOL(dwInfo & HANDLE_FLAG_INHERIT);
+
+    RTHANDLE h;
+    DWORD    dwType = GetFileType(hNative);
+    switch (dwType & ~FILE_TYPE_REMOTE)
+    {
+        default:
+        case FILE_TYPE_UNKNOWN:
+        case FILE_TYPE_CHAR:
+        case FILE_TYPE_DISK:
+            h.enmType = RTHANDLETYPE_FILE;
+            break;
+
+        case FILE_TYPE_PIPE:
+        {
+            DWORD cMaxInstances;
+            DWORD fInfo;
+            if (!GetNamedPipeInfo(hNative, &fInfo, NULL, NULL, &cMaxInstances))
+                h.enmType = RTHANDLETYPE_SOCKET;
+            else
+                h.enmType = RTHANDLETYPE_PIPE;
+            break;
+        }
+    }
+
+    /*
+     * Create the IPRT handle.
+     */
+    int rc;
+    switch (h.enmType)
+    {
+        case RTHANDLETYPE_FILE:
+            rc = RTFileFromNative(&h.u.hFile, (RTHCUINTPTR)hNative);
+            break;
+
+        case RTHANDLETYPE_PIPE:
+            rc = RTPipeFromNative(&h.u.hPipe, (RTHCUINTPTR)hNative,
+                                    (enmStdHandle == RTHANDLESTD_INPUT ? RTPIPE_N_READ : RTPIPE_N_WRITE)
+                                  | (fInherit ? RTPIPE_N_INHERIT : 0));
+            break;
+
+        case RTHANDLETYPE_SOCKET:
+            rc = rtSocketCreateForNative(&h.u.hSocket, (RTHCUINTPTR)hNative);
+            break;
+
+        default: /* shut up gcc */
+            return VERR_INTERNAL_ERROR;
+    }
+
+    if (RT_SUCCESS(rc))
+        *ph = h;
+
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTLocaleQueryNormalizedBaseLocaleName-win.cpp b/src/VBox/Runtime/r3/win/RTLocaleQueryNormalizedBaseLocaleName-win.cpp
new file mode 100644
index 00000000..1e37ede4
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTLocaleQueryNormalizedBaseLocaleName-win.cpp
@@ -0,0 +1,106 @@
+/* $Id: RTLocaleQueryNormalizedBaseLocaleName-win.cpp $ */
+/** @file
+ * IPRT - RTLocaleQueryNormalizedBaseLocaleName, ring-3, Windows.
+ */
+
+/*
+ * Copyright (C) 2017-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/windows.h>
+
+#include <iprt/locale.h>
+#include "internal/iprt.h"
+
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+RTDECL(int) RTLocaleQueryNormalizedBaseLocaleName(char *pszName, size_t cbName)
+{
+    /*
+     * Note! This part is duplicate of r3/generic/RTLocaleQueryNormalizedBaseLocaleName-r3-generic.cpp!
+     */
+    char szLocale[_1K];
+    int rc = RTLocaleQueryLocaleName(szLocale, sizeof(szLocale));
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * May return some complicated "LC_XXX=yyy;LC.." sequence if
+         * partially set (like IPRT does).  Try get xx_YY sequence first
+         * because 'C' or 'POSIX' may be LC_xxx variants that haven't been
+         * set yet.
+         *
+         * ASSUMES complicated locale mangling is done in a certain way...
+         */
+        const char *pszLocale = strchr(szLocale, '=');
+        if (!pszLocale)
+            pszLocale = szLocale;
+        else
+            pszLocale++;
+        bool fSeenC = false;
+        bool fSeenPOSIX = false;
+        do
+        {
+            const char *pszEnd = strchr(pszLocale, ';');
+
+            if (   RTLOCALE_IS_LANGUAGE2_UNDERSCORE_COUNTRY2(pszLocale)
+                && (   pszLocale[5] == '\0'
+                    || RT_C_IS_PUNCT(pszLocale[5])) )
+                return RTStrCopyEx(pszName, cbName, pszLocale, 5);
+
+            if (   pszLocale[0] == 'C'
+                && (   pszLocale[1] == '\0'
+                    || RT_C_IS_PUNCT(pszLocale[1])) )
+                fSeenC = true;
+            else if (   strncmp(pszLocale, "POSIX", 5) == 0
+                     && (   pszLocale[5] == '\0'
+                        || RT_C_IS_PUNCT(pszLocale[5])) )
+                fSeenPOSIX = true;
+
+            /* advance */
+            pszLocale = pszEnd ? strchr(pszEnd + 1, '=') : NULL;
+        } while (pszLocale++);
+
+        if (fSeenC || fSeenPOSIX)
+            return RTStrCopy(pszName, cbName, "C"); /* C and POSIX should be identical IIRC, so keep it simple. */
+
+        rc = VERR_NOT_AVAILABLE;
+    }
+
+    /*
+     * Fallback.
+     */
+    if (   GetLocaleInfoA(GetUserDefaultLCID(), LOCALE_SISO639LANGNAME, szLocale, sizeof(szLocale)) == 3
+        && GetLocaleInfoA(GetUserDefaultLCID(), LOCALE_SISO3166CTRYNAME, &szLocale[3], sizeof(szLocale) - 4) == 3)
+    {
+        szLocale[2] = '_';
+        Assert(RTLOCALE_IS_LANGUAGE2_UNDERSCORE_COUNTRY2(szLocale));
+        return RTStrCopy(pszName, cbName, szLocale);
+    }
+
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTLocaleQueryUserCountryCode-win.cpp b/src/VBox/Runtime/r3/win/RTLocaleQueryUserCountryCode-win.cpp
new file mode 100644
index 00000000..6da565fd
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTLocaleQueryUserCountryCode-win.cpp
@@ -0,0 +1,119 @@
+/* $Id: RTLocaleQueryUserCountryCode-win.cpp $ */
+/** @file
+ * IPRT - RTLocaleQueryUserCountryCode, ring-3, Windows.
+ */
+
+/*
+ * Copyright (C) 2017-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/windows.h>
+
+#include <iprt/locale.h>
+#include "internal/iprt.h"
+
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef GEOID (WINAPI *PFNGETUSERGEOID)(GEOCLASS);
+typedef INT   (WINAPI *PFNGETGEOINFOW)(GEOID,GEOTYPE,LPWSTR,INT,LANGID);
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Pointer to GetUserGeoID. */
+static PFNGETUSERGEOID  g_pfnGetUserGeoID = NULL;
+/** Pointer to GetGeoInfoW. */
+static PFNGETGEOINFOW   g_pfnGetGeoInfoW = NULL;
+/** Set if we've tried to resolve the APIs. */
+static bool volatile    g_fResolvedApis = false;
+
+
+RTDECL(int) RTLocaleQueryUserCountryCode(char pszCountryCode[3])
+{
+    /*
+     * Get API pointers.
+     */
+    PFNGETUSERGEOID  pfnGetUserGeoID;
+    PFNGETGEOINFOW   pfnGetGeoInfoW;
+    if (g_fResolvedApis)
+    {
+        pfnGetUserGeoID = g_pfnGetUserGeoID;
+        pfnGetGeoInfoW  = g_pfnGetGeoInfoW;
+    }
+    else
+    {
+        pfnGetUserGeoID = (PFNGETUSERGEOID)GetProcAddress(g_hModKernel32, "GetUserGeoID");
+        pfnGetGeoInfoW  = (PFNGETGEOINFOW)GetProcAddress(g_hModKernel32, "GetGeoInfoW");
+        g_pfnGetUserGeoID = pfnGetUserGeoID;
+        g_pfnGetGeoInfoW  = pfnGetGeoInfoW;
+        g_fResolvedApis   = true;
+    }
+
+    int rc;
+    if (   pfnGetGeoInfoW
+        && pfnGetUserGeoID)
+    {
+        /*
+         * Call the API and retrieve the two letter ISO country code.
+         */
+        GEOID idGeo = pfnGetUserGeoID(GEOCLASS_NATION);
+        if (idGeo != GEOID_NOT_AVAILABLE)
+        {
+            RTUTF16 wszName[16];
+            RT_ZERO(wszName);
+            DWORD cwcReturned = pfnGetGeoInfoW(idGeo, GEO_ISO2, wszName, RT_ELEMENTS(wszName), LOCALE_NEUTRAL);
+            if (   cwcReturned >= 2
+                && cwcReturned <= 3
+                && wszName[2] == '\0'
+                && wszName[1] != '\0'
+                && RT_C_IS_ALPHA(wszName[1])
+                && wszName[0] != '\0'
+                && RT_C_IS_ALPHA(wszName[0]) )
+            {
+                pszCountryCode[0] = RT_C_TO_UPPER(wszName[0]);
+                pszCountryCode[1] = RT_C_TO_UPPER(wszName[1]);
+                pszCountryCode[2] = '\0';
+                return VINF_SUCCESS;
+            }
+            AssertMsgFailed(("cwcReturned=%d err=%u wszName='%.16ls'\n", cwcReturned, GetLastError(), wszName));
+        }
+        rc = VERR_NOT_AVAILABLE;
+    }
+    else
+        rc = VERR_NOT_SUPPORTED;
+    pszCountryCode[0] = 'Z';
+    pszCountryCode[1] = 'Z';
+    pszCountryCode[2] = '\0';
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTLogWriteDebugger-win.cpp b/src/VBox/Runtime/r3/win/RTLogWriteDebugger-win.cpp
new file mode 100644
index 00000000..a394251a
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTLogWriteDebugger-win.cpp
@@ -0,0 +1,44 @@
+/* $Id: RTLogWriteDebugger-win.cpp $ */
+/** @file
+ * IPRT - Log To Debugger, Win32.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/windows.h>
+
+#include <iprt/log.h>
+#include <iprt/assert.h>
+
+
+RTDECL(void) RTLogWriteDebugger(const char *pch, size_t cb)
+{
+    if (pch[cb] != '\0')
+        AssertBreakpoint();
+    OutputDebugStringA(pch);
+    return;
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTSystemFirmware-win.cpp b/src/VBox/Runtime/r3/win/RTSystemFirmware-win.cpp
new file mode 100644
index 00000000..dcd574df
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTSystemFirmware-win.cpp
@@ -0,0 +1,213 @@
+/* $Id: RTSystemFirmware-win.cpp $ */
+/** @file
+ * IPRT - System firmware information, Win32.
+ */
+
+/*
+ * Copyright (C) 2019-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/iprt.h"
+#include <iprt/system.h>
+
+#include <iprt/nt/nt-and-windows.h>
+#include <WinSDKVer.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/ldr.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+#if _WIN32_MAXVER < 0x0602 /* Windows 7 or older, supply missing GetFirmwareType bits. */
+typedef enum _FIRMWARE_TYPE
+{
+    FirmwareTypeUnknown,
+    FirmwareTypeBios,
+    FirmwareTypeUefi,
+    FirmwareTypeMax
+} FIRMWARE_TYPE;
+typedef FIRMWARE_TYPE *PFIRMWARE_TYPE;
+WINBASEAPI BOOL WINAPI GetFirmwareType(PFIRMWARE_TYPE);
+#endif
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Defines the UEFI Globals UUID. */
+#define VBOX_UEFI_UUID_GLOBALS L"{8BE4DF61-93CA-11D2-AA0D-00E098032B8C}"
+/** Defines an UEFI dummy UUID, see MSDN docs of the API. */
+#define VBOX_UEFI_UUID_DUMMY   L"{00000000-0000-0000-0000-000000000000}"
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static volatile bool                              g_fResolvedApis = false;
+static decltype(GetFirmwareType)                 *g_pfnGetFirmwareType;
+static decltype(GetFirmwareEnvironmentVariableW) *g_pfnGetFirmwareEnvironmentVariableW;
+
+
+static void rtSystemFirmwareResolveApis(void)
+{
+    FARPROC pfnTmp1 = GetProcAddress(g_hModKernel32, "GetFirmwareType");
+    FARPROC pfnTmp2 = GetProcAddress(g_hModKernel32, "GetFirmwareEnvironmentVariableW");
+    ASMCompilerBarrier(); /* paranoia^2 */
+
+    g_pfnGetFirmwareType                 = (decltype(GetFirmwareType) *)pfnTmp1;
+    g_pfnGetFirmwareEnvironmentVariableW = (decltype(GetFirmwareEnvironmentVariableW) *)pfnTmp2;
+    ASMAtomicWriteBool(&g_fResolvedApis, true);
+}
+
+
+static int rtSystemFirmwareGetPrivileges(LPCTSTR pcszPrivilege)
+{
+    HANDLE hToken;
+    BOOL fRc = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken);
+    if (!fRc)
+        return RTErrConvertFromWin32(GetLastError());
+
+    int rc = VINF_SUCCESS;
+
+    TOKEN_PRIVILEGES tokenPriv;
+    fRc = LookupPrivilegeValue(NULL, pcszPrivilege, &tokenPriv.Privileges[0].Luid);
+    if (fRc)
+    {
+        tokenPriv.PrivilegeCount = 1;
+        tokenPriv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+        fRc = AdjustTokenPrivileges(hToken, FALSE, &tokenPriv, 0, (PTOKEN_PRIVILEGES)NULL, 0);
+        if (!fRc)
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    CloseHandle(hToken);
+
+    return rc;
+}
+
+
+RTDECL(int) RTSystemQueryFirmwareType(PRTSYSFWTYPE penmFirmwareType)
+{
+    AssertPtrReturn(penmFirmwareType, VERR_INVALID_POINTER);
+
+    if (!g_fResolvedApis)
+        rtSystemFirmwareResolveApis();
+
+    *penmFirmwareType = RTSYSFWTYPE_INVALID;
+    int rc = VERR_NOT_SUPPORTED;
+
+    /* GetFirmwareType is Windows 8 and later. */
+    if (g_pfnGetFirmwareType)
+    {
+        FIRMWARE_TYPE enmWinFwType;
+        if (g_pfnGetFirmwareType(&enmWinFwType))
+        {
+            switch (enmWinFwType)
+            {
+                case FirmwareTypeBios:
+                    *penmFirmwareType = RTSYSFWTYPE_BIOS;
+                    break;
+                case FirmwareTypeUefi:
+                    *penmFirmwareType = RTSYSFWTYPE_UEFI;
+                    break;
+                default:
+                    *penmFirmwareType = RTSYSFWTYPE_UNKNOWN;
+                    AssertMsgFailed(("%d\n", enmWinFwType));
+                    break;
+            }
+            rc = VINF_SUCCESS;
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    /* GetFirmwareEnvironmentVariableW is XP and later. */
+    else if (g_pfnGetFirmwareEnvironmentVariableW)
+    {
+        rtSystemFirmwareGetPrivileges(SE_SYSTEM_ENVIRONMENT_NAME);
+
+        /* On a non-UEFI system (or such a system in legacy boot mode), we will get
+           back ERROR_INVALID_FUNCTION when querying any firmware variable.  While on a
+           UEFI system we'll typically get ERROR_ACCESS_DENIED or similar as the dummy
+           is a non-exising dummy namespace.  See the API docs. */
+        SetLastError(0);
+        uint8_t abWhatever[64];
+        DWORD cbRet = g_pfnGetFirmwareEnvironmentVariableW(L"", VBOX_UEFI_UUID_DUMMY, abWhatever, sizeof(abWhatever));
+        DWORD dwErr = GetLastError();
+        *penmFirmwareType = cbRet != 0 || dwErr != ERROR_INVALID_FUNCTION ? RTSYSFWTYPE_UEFI : RTSYSFWTYPE_BIOS;
+        rc = VINF_SUCCESS;
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTSystemQueryFirmwareBoolean(RTSYSFWBOOL enmBoolean, bool *pfValue)
+{
+    *pfValue = false;
+
+    /*
+     * Translate the enmBoolean to a name:
+     */
+    const wchar_t *pwszName = NULL;
+    switch (enmBoolean)
+    {
+        case RTSYSFWBOOL_SECURE_BOOT:
+            pwszName = L"SecureBoot";
+            break;
+
+        default:
+            AssertReturn(enmBoolean > RTSYSFWBOOL_INVALID && enmBoolean < RTSYSFWBOOL_END, VERR_INVALID_PARAMETER);
+            return VERR_SYS_UNSUPPORTED_FIRMWARE_PROPERTY;
+    }
+
+    /*
+     * Do the query.
+     * Note! This will typically fail with access denied unless we're in an elevated process.
+     */
+    if (!g_pfnGetFirmwareEnvironmentVariableW)
+        return VERR_NOT_SUPPORTED;
+    rtSystemFirmwareGetPrivileges(SE_SYSTEM_ENVIRONMENT_NAME);
+
+    uint8_t bValue = 0;
+    DWORD cbRet = g_pfnGetFirmwareEnvironmentVariableW(pwszName, VBOX_UEFI_UUID_GLOBALS, &bValue, sizeof(bValue));
+    *pfValue = cbRet != 0 && bValue != 0;
+    if (cbRet != 0)
+        return VINF_SUCCESS;
+    DWORD dwErr = GetLastError();
+    if (   dwErr == ERROR_INVALID_FUNCTION
+        || dwErr == ERROR_ENVVAR_NOT_FOUND)
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(dwErr);
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTSystemQueryDmiString-win.cpp b/src/VBox/Runtime/r3/win/RTSystemQueryDmiString-win.cpp
new file mode 100644
index 00000000..ff42586e
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTSystemQueryDmiString-win.cpp
@@ -0,0 +1,259 @@
+/* $Id: RTSystemQueryDmiString-win.cpp $ */
+/** @file
+ * IPRT - RTSystemQueryDmiString, windows ring-3.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define _WIN32_DCOM
+#include <iprt/win/windows.h>
+#include <WbemCli.h>
+
+#include <iprt/system.h>
+#include "internal/iprt.h"
+
+#include <iprt/errcore.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+
+
+/**
+ * Initialize COM.
+ *
+ * @returns COM status code.
+ */
+static HRESULT rtSystemDmiWinInitialize(void)
+{
+    HRESULT hrc = CoInitializeEx(0, COINIT_MULTITHREADED);
+    if (SUCCEEDED(hrc))
+    {
+        hrc = CoInitializeSecurity(NULL,
+                                   -1,                          /* COM authentication. */
+                                   NULL,                        /* Which authentication services. */
+                                   NULL,                        /* Reserved. */
+                                   RPC_C_AUTHN_LEVEL_DEFAULT,   /* Default authentication. */
+                                   RPC_C_IMP_LEVEL_IMPERSONATE, /* Default impersonation. */
+                                   NULL,                        /* Authentication info. */
+                                   EOAC_NONE,                   /* Additional capabilities. */
+                                   NULL);                       /* Reserved. */
+        if (hrc == RPC_E_TOO_LATE)
+            hrc = S_OK;
+        else if (FAILED(hrc))
+            CoUninitialize();
+    }
+    return hrc;
+}
+
+
+/**
+ * Undo what rtSystemDmiWinInitialize did.
+ */
+static void rtSystemDmiWinTerminate(void)
+{
+    CoUninitialize();
+}
+
+
+/**
+ * Convert a UTF-8 string to a BSTR.
+ *
+ * @returns BSTR pointer.
+ * @param   psz                 The UTF-8 string.
+ */
+static BSTR rtSystemWinBstrFromUtf8(const char *psz)
+{
+    PRTUTF16 pwsz = NULL;
+    int rc = RTStrToUtf16(psz, &pwsz);
+    if (RT_FAILURE(rc))
+        return NULL;
+    BSTR pBStr = SysAllocString((const OLECHAR *)pwsz);
+    RTUtf16Free(pwsz);
+    return pBStr;
+}
+
+
+/**
+ * Connect to the DMI server.
+ *
+ * @returns COM status code.
+ * @param   pLocator            The locator.
+ * @param   pszServer           The server name.
+ * @param   ppServices          Where to return the services interface.
+ */
+static HRESULT rtSystemDmiWinConnectToServer(IWbemLocator *pLocator, const char *pszServer, IWbemServices **ppServices)
+{
+    AssertPtr(pLocator);
+    AssertPtrNull(pszServer);
+    AssertPtr(ppServices);
+
+    BSTR pBStrServer = rtSystemWinBstrFromUtf8(pszServer);
+    if (!pBStrServer)
+        return E_OUTOFMEMORY;
+
+    HRESULT hrc = pLocator->ConnectServer(pBStrServer,
+                                          NULL,
+                                          NULL,
+                                          0,
+                                          NULL,
+                                          0,
+                                          0,
+                                          ppServices);
+    if (SUCCEEDED(hrc))
+    {
+        hrc = CoSetProxyBlanket(*ppServices,
+                                RPC_C_AUTHN_WINNT,
+                                RPC_C_AUTHZ_NONE,
+                                NULL,
+                                RPC_C_AUTHN_LEVEL_CALL,
+                                RPC_C_IMP_LEVEL_IMPERSONATE,
+                                NULL,
+                                EOAC_NONE);
+        if (FAILED(hrc))
+            (*ppServices)->Release();
+    }
+    SysFreeString(pBStrServer);
+    return hrc;
+}
+
+
+RTDECL(int) RTSystemQueryDmiString(RTSYSDMISTR enmString, char *pszBuf, size_t cbBuf)
+{
+    AssertPtrReturn(pszBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbBuf > 0, VERR_INVALID_PARAMETER);
+    *pszBuf = '\0';
+    AssertReturn(enmString > RTSYSDMISTR_INVALID && enmString < RTSYSDMISTR_END, VERR_INVALID_PARAMETER);
+
+    /*
+     * Figure the property name before we start.
+     */
+    const char *pszPropName;
+    switch (enmString)
+    {
+        case RTSYSDMISTR_PRODUCT_NAME:      pszPropName = "Name"; break;
+        case RTSYSDMISTR_PRODUCT_VERSION:   pszPropName = "Version"; break;
+        case RTSYSDMISTR_PRODUCT_UUID:      pszPropName = "UUID"; break;
+        case RTSYSDMISTR_PRODUCT_SERIAL:    pszPropName = "IdentifyingNumber"; break;
+        case RTSYSDMISTR_MANUFACTURER:      pszPropName = "Vendor"; break;
+
+        default:
+            return VERR_NOT_SUPPORTED;
+    }
+
+    /*
+     * Before we do anything with COM, we have to initialize it.
+     */
+    bool fUninit = true;
+    HRESULT hrc = rtSystemDmiWinInitialize();
+    if (hrc == RPC_E_CHANGED_MODE)
+        fUninit = false;  /* don't fail if already initialized */
+    else if (FAILED(hrc))
+        return VERR_NOT_SUPPORTED;
+
+    int rc = VERR_NOT_SUPPORTED;
+    BSTR pBstrPropName = rtSystemWinBstrFromUtf8(pszPropName);
+    if (pBstrPropName)
+    {
+        /*
+         * Instantiate the IWbemLocator, whatever that is and connect to the
+         * DMI serve.
+         */
+        IWbemLocator *pLoc;
+        hrc = CoCreateInstance(CLSID_WbemLocator,
+                               0,
+                               CLSCTX_INPROC_SERVER,
+                               IID_IWbemLocator,
+                               (LPVOID *)&pLoc);
+        if (SUCCEEDED(hrc))
+        {
+            IWbemServices *pServices;
+            hrc = rtSystemDmiWinConnectToServer(pLoc, "ROOT\\CIMV2", &pServices);
+            if (SUCCEEDED(hrc))
+            {
+                /*
+                 * Enumerate whatever it is we're looking at and try get
+                 * the desired property.
+                 */
+                BSTR pBstrFilter = rtSystemWinBstrFromUtf8("Win32_ComputerSystemProduct");
+                if (pBstrFilter)
+                {
+                    IEnumWbemClassObject *pEnum;
+                    hrc = pServices->CreateInstanceEnum(pBstrFilter, 0, NULL, &pEnum);
+                    if (SUCCEEDED(hrc))
+                    {
+                        do
+                        {
+                            IWbemClassObject *pObj;
+                            ULONG cObjRet;
+                            hrc = pEnum->Next(WBEM_INFINITE, 1, &pObj, &cObjRet);
+                            if (   SUCCEEDED(hrc)
+                                && cObjRet >= 1)
+                            {
+                                VARIANT Var;
+                                VariantInit(&Var);
+                                hrc = pObj->Get(pBstrPropName, 0, &Var, 0, 0);
+                                if (   SUCCEEDED(hrc)
+                                    && V_VT(&Var) == VT_BSTR)
+                                {
+                                    /*
+                                     * Convert the BSTR to UTF-8 and copy it
+                                     * into the return buffer.
+                                     */
+                                    char *pszValue;
+                                    rc = RTUtf16ToUtf8(Var.bstrVal, &pszValue);
+                                    if (RT_SUCCESS(rc))
+                                    {
+                                        rc = RTStrCopy(pszBuf, cbBuf, pszValue);
+                                        RTStrFree(pszValue);
+                                        hrc = WBEM_S_FALSE;
+                                    }
+                                }
+                                VariantClear(&Var);
+                                pObj->Release();
+                            }
+                        } while (hrc != WBEM_S_FALSE);
+
+                        pEnum->Release();
+                    }
+                    SysFreeString(pBstrFilter);
+                }
+                else
+                    hrc = E_OUTOFMEMORY;
+                pServices->Release();
+            }
+            pLoc->Release();
+        }
+        SysFreeString(pBstrPropName);
+    }
+    else
+        hrc = E_OUTOFMEMORY;
+    if (fUninit)
+        rtSystemDmiWinTerminate();
+    if (FAILED(hrc) && rc == VERR_NOT_SUPPORTED)
+        rc = VERR_NOT_SUPPORTED;
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTSystemQueryOSInfo-win.cpp b/src/VBox/Runtime/r3/win/RTSystemQueryOSInfo-win.cpp
new file mode 100644
index 00000000..03358471
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTSystemQueryOSInfo-win.cpp
@@ -0,0 +1,356 @@
+/* $Id: RTSystemQueryOSInfo-win.cpp $ */
+/** @file
+ * IPRT - RTSystemQueryOSInfo, generic stub.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/iprt.h"
+#include <iprt/win/windows.h>
+#include <WinUser.h>
+
+#include "internal-r3-win.h"
+#include <iprt/system.h>
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+
+/**
+ * These are the PRODUCT_* defines found in the Vista Platform SDK and returned
+ * by GetProductInfo().
+ *
+ * We define them ourselves because we don't necessarily have any Vista PSDK around.
+ */
+typedef enum RTWINPRODTYPE
+{
+    kRTWinProdType_UNDEFINED                    = 0x00000000,  ///< An unknown product
+    kRTWinProdType_BUSINESS                     = 0x00000006,  ///< Business Edition
+    kRTWinProdType_BUSINESS_N                   = 0x00000010,  ///< Business Edition
+    kRTWinProdType_CLUSTER_SERVER               = 0x00000012,  ///< Cluster Server Edition
+    kRTWinProdType_DATACENTER_SERVER            = 0x00000008,  ///< Server Datacenter Edition (full installation)
+    kRTWinProdType_DATACENTER_SERVER_CORE       = 0x0000000C,  ///< Server Datacenter Edition (core installation)
+    kRTWinProdType_ENTERPRISE                   = 0x00000004,  ///< Enterprise Edition
+    kRTWinProdType_ENTERPRISE_N                 = 0x0000001B,  ///< Enterprise Edition
+    kRTWinProdType_ENTERPRISE_SERVER            = 0x0000000A,  ///< Server Enterprise Edition (full installation)
+    kRTWinProdType_ENTERPRISE_SERVER_CORE       = 0x0000000E,  ///< Server Enterprise Edition (core installation)
+    kRTWinProdType_ENTERPRISE_SERVER_IA64       = 0x0000000F,  ///< Server Enterprise Edition for Itanium-based Systems
+    kRTWinProdType_HOME_BASIC                   = 0x00000002,  ///< Home Basic Edition
+    kRTWinProdType_HOME_BASIC_N                 = 0x00000005,  ///< Home Basic Edition
+    kRTWinProdType_HOME_PREMIUM                 = 0x00000003,  ///< Home Premium Edition
+    kRTWinProdType_HOME_PREMIUM_N               = 0x0000001A,  ///< Home Premium Edition
+    kRTWinProdType_HOME_SERVER                  = 0x00000013,  ///< Home Server Edition
+    kRTWinProdType_SERVER_FOR_SMALLBUSINESS     = 0x00000018,  ///< Server for Small Business Edition
+    kRTWinProdType_SMALLBUSINESS_SERVER         = 0x00000009,  ///< Small Business Server
+    kRTWinProdType_SMALLBUSINESS_SERVER_PREMIUM = 0x00000019,  ///< Small Business Server Premium Edition
+    kRTWinProdType_STANDARD_SERVER              = 0x00000007,  ///< Server Standard Edition (full installation)
+    kRTWinProdType_STANDARD_SERVER_CORE         = 0x0000000D,  ///< Server Standard Edition (core installation)
+    kRTWinProdType_STARTER                      = 0x0000000B,  ///< Starter Edition
+    kRTWinProdType_STORAGE_ENTERPRISE_SERVER    = 0x00000017,  ///< Storage Server Enterprise Edition
+    kRTWinProdType_STORAGE_EXPRESS_SERVER       = 0x00000014,  ///< Storage Server Express Edition
+    kRTWinProdType_STORAGE_STANDARD_SERVER      = 0x00000015,  ///< Storage Server Standard Edition
+    kRTWinProdType_STORAGE_WORKGROUP_SERVER     = 0x00000016,  ///< Storage Server Workgroup Edition
+    kRTWinProdType_ULTIMATE                     = 0x00000001,  ///< Ultimate Edition
+    kRTWinProdType_ULTIMATE_N                   = 0x0000001C,  ///< Ultimate Edition
+    kRTWinProdType_WEB_SERVER                   = 0x00000011,  ///< Web Server Edition (full)
+    kRTWinProdType_WEB_SERVER_CORE              = 0x0000001D   ///< Web Server Edition (core)
+} RTWINPRODTYPE;
+
+
+/**
+ * Wrapper around the GetProductInfo API.
+ *
+ * @returns The vista type.
+ */
+static RTWINPRODTYPE rtSystemWinGetProductInfo(DWORD dwOSMajorVersion, DWORD dwOSMinorVersion, DWORD dwSpMajorVersion, DWORD dwSpMinorVersion)
+{
+    BOOL (WINAPI *pfnGetProductInfo)(DWORD, DWORD, DWORD, DWORD, PDWORD);
+    pfnGetProductInfo = (BOOL (WINAPI *)(DWORD, DWORD, DWORD, DWORD, PDWORD))GetProcAddress(GetModuleHandle("kernel32.dll"), "GetProductInfo");
+    if (pfnGetProductInfo)
+    {
+        DWORD dwProductType = kRTWinProdType_UNDEFINED;
+        if (pfnGetProductInfo(dwOSMajorVersion, dwOSMinorVersion, dwSpMajorVersion, dwSpMinorVersion, &dwProductType))
+            return (RTWINPRODTYPE)dwProductType;
+    }
+    return kRTWinProdType_UNDEFINED;
+}
+
+
+
+/**
+ * Appends the product type if available.
+ *
+ * @param   pszTmp      The buffer. Assumes it's big enough.
+ */
+static void rtSystemWinAppendProductType(char *pszTmp)
+{
+    RTWINPRODTYPE enmVistaType = rtSystemWinGetProductInfo(6, 0, 0, 0);
+    switch (enmVistaType)
+    {
+        case kRTWinProdType_BUSINESS:                        strcat(pszTmp, " Business Edition"); break;
+        case kRTWinProdType_BUSINESS_N:                      strcat(pszTmp, " Business Edition"); break;
+        case kRTWinProdType_CLUSTER_SERVER:                  strcat(pszTmp, " Cluster Server Edition"); break;
+        case kRTWinProdType_DATACENTER_SERVER:               strcat(pszTmp, " Server Datacenter Edition (full installation)"); break;
+        case kRTWinProdType_DATACENTER_SERVER_CORE:          strcat(pszTmp, " Server Datacenter Edition (core installation)"); break;
+        case kRTWinProdType_ENTERPRISE:                      strcat(pszTmp, " Enterprise Edition"); break;
+        case kRTWinProdType_ENTERPRISE_N:                    strcat(pszTmp, " Enterprise Edition"); break;
+        case kRTWinProdType_ENTERPRISE_SERVER:               strcat(pszTmp, " Server Enterprise Edition (full installation)"); break;
+        case kRTWinProdType_ENTERPRISE_SERVER_CORE:          strcat(pszTmp, " Server Enterprise Edition (core installation)"); break;
+        case kRTWinProdType_ENTERPRISE_SERVER_IA64:          strcat(pszTmp, " Server Enterprise Edition for Itanium-based Systems"); break;
+        case kRTWinProdType_HOME_BASIC:                      strcat(pszTmp, " Home Basic Edition"); break;
+        case kRTWinProdType_HOME_BASIC_N:                    strcat(pszTmp, " Home Basic Edition"); break;
+        case kRTWinProdType_HOME_PREMIUM:                    strcat(pszTmp, " Home Premium Edition"); break;
+        case kRTWinProdType_HOME_PREMIUM_N:                  strcat(pszTmp, " Home Premium Edition"); break;
+        case kRTWinProdType_HOME_SERVER:                     strcat(pszTmp, " Home Server Edition"); break;
+        case kRTWinProdType_SERVER_FOR_SMALLBUSINESS:        strcat(pszTmp, " Server for Small Business Edition"); break;
+        case kRTWinProdType_SMALLBUSINESS_SERVER:            strcat(pszTmp, " Small Business Server"); break;
+        case kRTWinProdType_SMALLBUSINESS_SERVER_PREMIUM:    strcat(pszTmp, " Small Business Server Premium Edition"); break;
+        case kRTWinProdType_STANDARD_SERVER:                 strcat(pszTmp, " Server Standard Edition (full installation)"); break;
+        case kRTWinProdType_STANDARD_SERVER_CORE:            strcat(pszTmp, " Server Standard Edition (core installation)"); break;
+        case kRTWinProdType_STARTER:                         strcat(pszTmp, " Starter Edition"); break;
+        case kRTWinProdType_STORAGE_ENTERPRISE_SERVER:       strcat(pszTmp, " Storage Server Enterprise Edition"); break;
+        case kRTWinProdType_STORAGE_EXPRESS_SERVER:          strcat(pszTmp, " Storage Server Express Edition"); break;
+        case kRTWinProdType_STORAGE_STANDARD_SERVER:         strcat(pszTmp, " Storage Server Standard Edition"); break;
+        case kRTWinProdType_STORAGE_WORKGROUP_SERVER:        strcat(pszTmp, " Storage Server Workgroup Edition"); break;
+        case kRTWinProdType_ULTIMATE:                        strcat(pszTmp, " Ultimate Edition"); break;
+        case kRTWinProdType_ULTIMATE_N:                      strcat(pszTmp, " Ultimate Edition"); break;
+        case kRTWinProdType_WEB_SERVER:                      strcat(pszTmp, " Web Server Edition (full installation)"); break;
+        case kRTWinProdType_WEB_SERVER_CORE:                 strcat(pszTmp, " Web Server Edition (core installation)"); break;
+        case kRTWinProdType_UNDEFINED:                       break;
+    }
+}
+
+
+/**
+ * Services the  RTSYSOSINFO_PRODUCT, RTSYSOSINFO_RELEASE
+ * and RTSYSOSINFO_SERVICE_PACK requests.
+ *
+ * @returns See RTSystemQueryOSInfo.
+ * @param   enmInfo         See RTSystemQueryOSInfo.
+ * @param   pszInfo         See RTSystemQueryOSInfo.
+ * @param   cchInfo         See RTSystemQueryOSInfo.
+ */
+static int rtSystemWinQueryOSVersion(RTSYSOSINFO enmInfo, char *pszInfo, size_t cchInfo)
+{
+    /*
+     * Make sure it's terminated correctly in case of error.
+     */
+    *pszInfo = '\0';
+
+    /*
+     * Check that we got the windows version at init time.
+     */
+    AssertReturn(g_WinOsInfoEx.dwOSVersionInfoSize, VERR_WRONG_ORDER);
+
+    /*
+     * Service the request.
+     */
+    char szTmp[512];
+    szTmp[0] = '\0';
+    switch (enmInfo)
+    {
+        /*
+         * The product name.
+         */
+        case RTSYSOSINFO_PRODUCT:
+        {
+            switch (g_enmWinVer)
+            {
+                case kRTWinOSType_95:           strcpy(szTmp, "Windows 95"); break;
+                case kRTWinOSType_95SP1:        strcpy(szTmp, "Windows 95 (Service Pack 1)"); break;
+                case kRTWinOSType_95OSR2:       strcpy(szTmp, "Windows 95 (OSR 2)"); break;
+                case kRTWinOSType_98:           strcpy(szTmp, "Windows 98"); break;
+                case kRTWinOSType_98SP1:        strcpy(szTmp, "Windows 98 (Service Pack 1)"); break;
+                case kRTWinOSType_98SE:         strcpy(szTmp, "Windows 98 (Second Edition)"); break;
+                case kRTWinOSType_ME:           strcpy(szTmp, "Windows Me"); break;
+                case kRTWinOSType_NT310:        strcpy(szTmp, "Windows NT 3.10"); break;
+                case kRTWinOSType_NT350:        strcpy(szTmp, "Windows NT 3.50"); break;
+                case kRTWinOSType_NT351:        strcpy(szTmp, "Windows NT 3.51"); break;
+                case kRTWinOSType_NT4:          strcpy(szTmp, "Windows NT 4.0"); break;
+                case kRTWinOSType_2K:           strcpy(szTmp, "Windows 2000"); break;
+                case kRTWinOSType_XP:
+                    strcpy(szTmp, "Windows XP");
+                    if (g_WinOsInfoEx.wSuiteMask & VER_SUITE_PERSONAL)
+                        strcat(szTmp, " Home");
+                    if (    g_WinOsInfoEx.wProductType == VER_NT_WORKSTATION
+                        && !(g_WinOsInfoEx.wSuiteMask & VER_SUITE_PERSONAL))
+                        strcat(szTmp, " Professional");
+#if 0 /** @todo fixme */
+                    if (GetSystemMetrics(SM_MEDIACENTER))
+                        strcat(szTmp, " Media Center");
+#endif
+                    break;
+
+                case kRTWinOSType_2003:         strcpy(szTmp, "Windows 2003"); break;
+                case kRTWinOSType_VISTA:
+                {
+                    strcpy(szTmp, "Windows Vista");
+                    rtSystemWinAppendProductType(szTmp);
+                    break;
+                }
+                case kRTWinOSType_2008:         strcpy(szTmp, "Windows 2008"); break;
+                case kRTWinOSType_7:            strcpy(szTmp, "Windows 7"); break;
+                case kRTWinOSType_2008R2:       strcpy(szTmp, "Windows 2008 R2"); break;
+                case kRTWinOSType_8:            strcpy(szTmp, "Windows 8"); break;
+                case kRTWinOSType_2012:         strcpy(szTmp, "Windows 2012"); break;
+                case kRTWinOSType_81:           strcpy(szTmp, "Windows 8.1"); break;
+                case kRTWinOSType_2012R2:       strcpy(szTmp, "Windows 2012 R2"); break;
+                case kRTWinOSType_10:           strcpy(szTmp, "Windows 10"); break;
+                case kRTWinOSType_2016:         strcpy(szTmp, "Windows 2016"); break;
+
+                case kRTWinOSType_NT_UNKNOWN:
+                    RTStrPrintf(szTmp, sizeof(szTmp), "Unknown NT v%u.%u",
+                                g_WinOsInfoEx.dwMajorVersion, g_WinOsInfoEx.dwMinorVersion);
+                    break;
+
+                default:
+                    AssertFailed();
+                case kRTWinOSType_UNKNOWN:
+                    RTStrPrintf(szTmp, sizeof(szTmp), "Unknown %d v%u.%u",
+                                g_WinOsInfoEx.dwPlatformId, g_WinOsInfoEx.dwMajorVersion, g_WinOsInfoEx.dwMinorVersion);
+                    break;
+            }
+            break;
+        }
+
+        /*
+         * The release.
+         */
+        case RTSYSOSINFO_RELEASE:
+        {
+            RTStrPrintf(szTmp, sizeof(szTmp), "%u.%u.%u",
+                        g_WinOsInfoEx.dwMajorVersion, g_WinOsInfoEx.dwMinorVersion, g_WinOsInfoEx.dwBuildNumber);
+            break;
+        }
+
+
+        /*
+         * Get the service pack.
+         */
+        case RTSYSOSINFO_SERVICE_PACK:
+        {
+            if (g_WinOsInfoEx.wServicePackMajor)
+            {
+                if (g_WinOsInfoEx.wServicePackMinor)
+                    RTStrPrintf(szTmp, sizeof(szTmp), "%u.%u",
+                                (unsigned)g_WinOsInfoEx.wServicePackMajor, (unsigned)g_WinOsInfoEx.wServicePackMinor);
+                else
+                    RTStrPrintf(szTmp, sizeof(szTmp), "%u",
+                                (unsigned)g_WinOsInfoEx.wServicePackMajor);
+            }
+            else if (g_WinOsInfoEx.szCSDVersion[0])
+            {
+                /* just copy the entire string. */
+                char *pszTmp = szTmp;
+                int rc = RTUtf16ToUtf8Ex(g_WinOsInfoEx.szCSDVersion, RT_ELEMENTS(g_WinOsInfoEx.szCSDVersion),
+                                         &pszTmp, sizeof(szTmp), NULL);
+                if (RT_SUCCESS(rc))
+                    RTStrStripR(szTmp);
+                else
+                    szTmp[0] = '\0';
+                AssertCompile(sizeof(szTmp) > sizeof(g_WinOsInfoEx.szCSDVersion));
+            }
+            else
+            {
+                switch (g_enmWinVer)
+                {
+                    case kRTWinOSType_95SP1:    strcpy(szTmp, "1"); break;
+                    case kRTWinOSType_98SP1:    strcpy(szTmp, "1"); break;
+                    default:
+                        break;
+                }
+            }
+            break;
+        }
+
+        default:
+            AssertFatalFailed();
+    }
+
+    /*
+     * Copy the result to the return buffer.
+     */
+    size_t cchTmp = strlen(szTmp);
+    Assert(cchTmp < sizeof(szTmp));
+    if (cchTmp < cchInfo)
+    {
+        memcpy(pszInfo, szTmp, cchTmp + 1);
+        return VINF_SUCCESS;
+    }
+    memcpy(pszInfo, szTmp, cchInfo - 1);
+    pszInfo[cchInfo - 1] = '\0';
+    return VERR_BUFFER_OVERFLOW;
+}
+
+
+
+RTDECL(int) RTSystemQueryOSInfo(RTSYSOSINFO enmInfo, char *pszInfo, size_t cchInfo)
+{
+    /*
+     * Quick validation.
+     */
+    AssertReturn(enmInfo > RTSYSOSINFO_INVALID && enmInfo < RTSYSOSINFO_END, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pszInfo, VERR_INVALID_POINTER);
+    if (!cchInfo)
+        return VERR_BUFFER_OVERFLOW;
+
+
+    /*
+     * Handle the request.
+     */
+    switch (enmInfo)
+    {
+        case RTSYSOSINFO_PRODUCT:
+        case RTSYSOSINFO_RELEASE:
+        case RTSYSOSINFO_SERVICE_PACK:
+            return rtSystemWinQueryOSVersion(enmInfo, pszInfo, cchInfo);
+
+        case RTSYSOSINFO_VERSION:
+        default:
+            *pszInfo = '\0';
+    }
+
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(uint32_t) RTSystemGetNtBuildNo(void)
+{
+    return g_WinOsInfoEx.dwBuildNumber;
+}
+
+
+RTDECL(uint64_t) RTSystemGetNtVersion(void)
+{
+    return RTSYSTEM_MAKE_NT_VERSION(g_WinOsInfoEx.dwMajorVersion, g_WinOsInfoEx.dwMinorVersion, g_WinOsInfoEx.dwBuildNumber);
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTSystemQueryTotalRam-win.cpp b/src/VBox/Runtime/r3/win/RTSystemQueryTotalRam-win.cpp
new file mode 100644
index 00000000..78493e4f
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTSystemQueryTotalRam-win.cpp
@@ -0,0 +1,121 @@
+/* $Id: RTSystemQueryTotalRam-win.cpp $ */
+/** @file
+ * IPRT - RTSystemQueryTotalRam, windows ring-3.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/windows.h>
+#include <iprt/system.h>
+#include "internal/iprt.h"
+
+#include <iprt/errcore.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static bool volatile            g_fInitialized = false;
+typedef BOOL (WINAPI *PFNGLOBALMEMORYSTATUSEX)(LPMEMORYSTATUSEX);
+static PFNGLOBALMEMORYSTATUSEX  g_pfnGlobalMemoryStatusEx = NULL;
+
+
+/**
+ * The GlobalMemoryStatusEx API is not available on older Windows version.
+ *
+ * @returns Pointer to GlobalMemoryStatusEx or NULL if not available.
+ */
+DECLINLINE(PFNGLOBALMEMORYSTATUSEX) rtSystemWinGetExApi(void)
+{
+    PFNGLOBALMEMORYSTATUSEX pfnEx;
+    if (g_fInitialized)
+        pfnEx = g_pfnGlobalMemoryStatusEx;
+    else
+    {
+        pfnEx = (PFNGLOBALMEMORYSTATUSEX)GetProcAddress(g_hModKernel32, "GlobalMemoryStatusEx");
+        g_pfnGlobalMemoryStatusEx = pfnEx;
+        g_fInitialized = true;
+    }
+    return pfnEx;
+}
+
+
+RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb)
+{
+    AssertPtrReturn(pcb, VERR_INVALID_POINTER);
+
+    int rc = VINF_SUCCESS;
+    PFNGLOBALMEMORYSTATUSEX pfnGlobalMemoryStatusEx = rtSystemWinGetExApi();
+    if (pfnGlobalMemoryStatusEx)
+    {
+        MEMORYSTATUSEX MemStatus;
+        MemStatus.dwLength = sizeof(MemStatus);
+        if (pfnGlobalMemoryStatusEx(&MemStatus))
+            *pcb = MemStatus.ullTotalPhys;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+    {
+        MEMORYSTATUS MemStatus;
+        RT_ZERO(MemStatus);
+        MemStatus.dwLength = sizeof(MemStatus);
+        GlobalMemoryStatus(&MemStatus);
+        *pcb = MemStatus.dwTotalPhys;
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTSystemQueryAvailableRam(uint64_t *pcb)
+{
+    AssertPtrReturn(pcb, VERR_INVALID_POINTER);
+
+    int rc = VINF_SUCCESS;
+    PFNGLOBALMEMORYSTATUSEX pfnGlobalMemoryStatusEx = rtSystemWinGetExApi();
+    if (pfnGlobalMemoryStatusEx)
+    {
+        MEMORYSTATUSEX MemStatus;
+        MemStatus.dwLength = sizeof(MemStatus);
+        if (pfnGlobalMemoryStatusEx(&MemStatus))
+            *pcb = MemStatus.ullAvailPhys;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+    {
+        MEMORYSTATUS MemStatus;
+        RT_ZERO(MemStatus);
+        MemStatus.dwLength = sizeof(MemStatus);
+        GlobalMemoryStatus(&MemStatus);
+        *pcb = MemStatus.dwAvailPhys;
+    }
+    return rc;
+}
diff --git a/src/VBox/Runtime/r3/win/RTSystemShutdown-win.cpp b/src/VBox/Runtime/r3/win/RTSystemShutdown-win.cpp
new file mode 100644
index 00000000..979ef102
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTSystemShutdown-win.cpp
@@ -0,0 +1,173 @@
+/* $Id: RTSystemShutdown-win.cpp $ */
+/** @file
+ * IPRT - RTSystemShutdown, Windows.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/system.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+
+#include <iprt/win/windows.h>
+
+
+RTDECL(int) RTSystemShutdown(RTMSINTERVAL cMsDelay, uint32_t fFlags, const char *pszLogMsg)
+{
+    AssertPtrReturn(pszLogMsg, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTSYSTEM_SHUTDOWN_VALID_MASK), VERR_INVALID_PARAMETER);
+
+    /*
+     * Before we start, try grant the necessary privileges.
+     */
+    DWORD  dwErr;
+    HANDLE hToken = NULL;
+    if (OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE /*OpenAsSelf*/, &hToken))
+        dwErr = NO_ERROR;
+    else
+    {
+        dwErr  = GetLastError();
+        if (dwErr == ERROR_NO_TOKEN)
+        {
+            if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken))
+                dwErr = NO_ERROR;
+            else
+                dwErr = GetLastError();
+        }
+    }
+    if (dwErr == NO_ERROR)
+    {
+        union
+        {
+            TOKEN_PRIVILEGES TokenPriv;
+            char ab[sizeof(TOKEN_PRIVILEGES) + sizeof(LUID_AND_ATTRIBUTES)];
+        } u;
+        u.TokenPriv.PrivilegeCount = 1;
+        u.TokenPriv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+        if (LookupPrivilegeValue(NULL /*localhost*/, SE_SHUTDOWN_NAME, &u.TokenPriv.Privileges[0].Luid))
+        {
+            if (!AdjustTokenPrivileges(hToken,
+                                       FALSE /*DisableAllPrivileges*/,
+                                       &u.TokenPriv,
+                                       RT_UOFFSETOF(TOKEN_PRIVILEGES, Privileges[1]),
+                                       NULL,
+                                       NULL) )
+                dwErr = GetLastError();
+        }
+        else
+            dwErr = GetLastError();
+        CloseHandle(hToken);
+    }
+
+    /*
+     * Do some parameter conversion.
+     */
+    PRTUTF16 pwszLogMsg;
+    int rc = RTStrToUtf16(pszLogMsg, &pwszLogMsg);
+    if (RT_FAILURE(rc))
+        return rc;
+    DWORD cSecsTimeout = (cMsDelay + 499) / 1000;
+
+    /*
+     * If we're told to power off the system, we should try use InitiateShutdownW (6.0+)
+     * or ExitWindowsEx (3.50) rather than InitiateSystemShutdownW, because these other
+     * APIs allows us to explicitly specify that we want to power off.
+     *
+     * Note! For NT version 4, 3.51, and 3.50 the system may instaed reboot since the
+     *       x86 HALs typically didn't know how to perform a power off.
+     */
+    bool fDone = false;
+    if (   (fFlags & RTSYSTEM_SHUTDOWN_ACTION_MASK) == RTSYSTEM_SHUTDOWN_POWER_OFF
+        || (fFlags & RTSYSTEM_SHUTDOWN_ACTION_MASK) == RTSYSTEM_SHUTDOWN_POWER_OFF_HALT)
+    {
+        /* This API has the grace period thing. */
+        decltype(InitiateShutdownW) *pfnInitiateShutdownW;
+        pfnInitiateShutdownW = (decltype(InitiateShutdownW) *)GetProcAddress(GetModuleHandleW(L"ADVAPI32.DLL"), "InitiateShutdownW");
+        if (pfnInitiateShutdownW)
+        {
+            DWORD fShutdownFlags = SHUTDOWN_POWEROFF;
+            if (fFlags & RTSYSTEM_SHUTDOWN_FORCE)
+                fShutdownFlags |= SHUTDOWN_FORCE_OTHERS | SHUTDOWN_FORCE_SELF;
+            DWORD fReason = SHTDN_REASON_MAJOR_OTHER | (fFlags & RTSYSTEM_SHUTDOWN_PLANNED ? SHTDN_REASON_FLAG_PLANNED : 0);
+            dwErr = pfnInitiateShutdownW(NULL /*pwszMachineName*/, pwszLogMsg, cSecsTimeout, fShutdownFlags, fReason);
+            if (dwErr == ERROR_INVALID_PARAMETER)
+            {
+                fReason &= ~SHTDN_REASON_FLAG_PLANNED; /* just in case... */
+                dwErr = pfnInitiateShutdownW(NULL /*pwszMachineName*/, pwszLogMsg, cSecsTimeout, fShutdownFlags, fReason);
+            }
+            if (dwErr == ERROR_SUCCESS)
+            {
+                rc = VINF_SUCCESS;
+                fDone = true;
+            }
+        }
+
+        if (!fDone)
+        {
+            /* No grace period here, too bad. */
+            decltype(ExitWindowsEx) *pfnExitWindowsEx;
+            pfnExitWindowsEx = (decltype(ExitWindowsEx) *)GetProcAddress(GetModuleHandleW(L"USER32.DLL"), "ExitWindowsEx");
+            if (pfnExitWindowsEx)
+            {
+                DWORD fExitWindows = EWX_POWEROFF | EWX_SHUTDOWN;
+                if (fFlags & RTSYSTEM_SHUTDOWN_FORCE)
+                    fExitWindows |= EWX_FORCE | EWX_FORCEIFHUNG;
+
+                if (pfnExitWindowsEx(fExitWindows, SHTDN_REASON_MAJOR_OTHER))
+                    fDone = true;
+                else if (pfnExitWindowsEx(fExitWindows & ~EWX_FORCEIFHUNG, SHTDN_REASON_MAJOR_OTHER))
+                    fDone = true;
+            }
+        }
+    }
+
+    /*
+     * Fall back on the oldest API.
+     */
+    if (!fDone)
+    {
+        BOOL fRebootAfterShutdown = (fFlags & RTSYSTEM_SHUTDOWN_ACTION_MASK) == RTSYSTEM_SHUTDOWN_REBOOT
+                                   ? TRUE : FALSE;
+        BOOL fForceAppsClosed     = fFlags & RTSYSTEM_SHUTDOWN_FORCE ? TRUE : FALSE;
+        if (InitiateSystemShutdownW(NULL /*pwszMachineName = NULL = localhost*/,
+                                    pwszLogMsg,
+                                    cSecsTimeout,
+                                    fForceAppsClosed,
+                                    fRebootAfterShutdown))
+            rc = (fFlags & RTSYSTEM_SHUTDOWN_ACTION_MASK) == RTSYSTEM_SHUTDOWN_HALT ? VINF_SYS_MAY_POWER_OFF : VINF_SUCCESS;
+        else
+            rc = RTErrConvertFromWin32(dwErr);
+    }
+
+    RTUtf16Free(pwszLogMsg);
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTSystemShutdown);
+
diff --git a/src/VBox/Runtime/r3/win/RTTimeZoneGetCurrent-win.cpp b/src/VBox/Runtime/r3/win/RTTimeZoneGetCurrent-win.cpp
new file mode 100644
index 00000000..db81bec9
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTTimeZoneGetCurrent-win.cpp
@@ -0,0 +1,107 @@
+/* $Id: RTTimeZoneGetCurrent-win.cpp $ */
+/** @file
+ * IPRT - RTTimeZoneGetCurrent, generic.
+ */
+
+/*
+ * Copyright (C) 2017-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/time.h>
+#include "internal/iprt.h"
+
+#include <iprt/errcore.h>
+#include <iprt/env.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+#include <iprt/win/windows.h>
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef DWORD (WINAPI *PFNGETDYNAMICTIMEZONEINFORMATION)(PDYNAMIC_TIME_ZONE_INFORMATION);
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Pointer to the GetDynamicTimeZoneInformation API if present. */
+static PFNGETDYNAMICTIMEZONEINFORMATION g_pfnGetDynamicTimeZoneInformation = NULL;
+/** Flipped after we've tried to resolve g_pfnGetDynamicTimeZoneInformation.  */
+static bool volatile                    g_fResolvedApi = false;
+
+
+RTDECL(int) RTTimeZoneGetCurrent(char *pszName, size_t cbName)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertReturn(cbName > 0, VERR_BUFFER_OVERFLOW);
+
+    /*
+     * Resolve API.
+     */
+    PFNGETDYNAMICTIMEZONEINFORMATION pfnApi;
+    if (g_fResolvedApi)
+        pfnApi = g_pfnGetDynamicTimeZoneInformation;
+    else
+    {
+        pfnApi = (PFNGETDYNAMICTIMEZONEINFORMATION)GetProcAddress(g_hModKernel32, "GetDynamicTimeZoneInformation");
+        g_pfnGetDynamicTimeZoneInformation = pfnApi;
+        g_fResolvedApi = true;
+    }
+
+    /*
+     * Call the API and convert the name we get.
+     */
+    union
+    {
+        TIME_ZONE_INFORMATION           Tzi;
+        DYNAMIC_TIME_ZONE_INFORMATION   DynTzi;
+    } uBuf;
+    RT_ZERO(uBuf);
+    DWORD     dwRc;
+    PCRTUTF16 pwszSrcName;
+    size_t    cwcSrcName;
+    if (pfnApi)
+    {
+        dwRc = pfnApi(&uBuf.DynTzi);
+        pwszSrcName = uBuf.DynTzi.TimeZoneKeyName;
+        cwcSrcName  = RT_ELEMENTS(uBuf.DynTzi.TimeZoneKeyName);
+    }
+    else
+    {
+        /* Not sure how helpful this fallback really is... */
+        dwRc = GetTimeZoneInformation(&uBuf.Tzi);
+        pwszSrcName = uBuf.Tzi.StandardName;
+        cwcSrcName  = RT_ELEMENTS(uBuf.Tzi.StandardName);
+    }
+    if (dwRc != TIME_ZONE_ID_INVALID)
+    {
+        Assert(*pwszSrcName != '\0');
+        return RTUtf16ToUtf8Ex(pwszSrcName, cwcSrcName, &pszName, cbName, &cbName);
+    }
+    return RTErrConvertFromWin32(GetLastError());
+}
+
diff --git a/src/VBox/Runtime/r3/win/RTUuidCreate-win.cpp b/src/VBox/Runtime/r3/win/RTUuidCreate-win.cpp
new file mode 100644
index 00000000..466ce2f6
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/RTUuidCreate-win.cpp
@@ -0,0 +1,72 @@
+/* $Id: RTUuidCreate-win.cpp $ */
+/** @file
+ * IPRT - UUID, Windows RTUuidCreate implementation.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_UUID
+#include <iprt/win/windows.h>
+
+#include <iprt/uuid.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/rand.h>
+
+#include "internal-r3-win.h"
+
+
+RTDECL(int)  RTUuidCreate(PRTUUID pUuid)
+{
+    /*
+     * Input validation.
+     */
+    AssertPtrReturn(pUuid, VERR_INVALID_POINTER);
+
+    /*
+     * When using the UuidCreate API shortly after boot on NT 3.1 it typcially
+     * hangs for a long long time while polling for some service to start.
+     * What then usually happens next is a failure because it couldn't figure
+     * out the MAC address of the NIC.  So, on NT 3.1 we always use the fallback.
+     */
+    if (g_enmWinVer != kRTWinOSType_NT310)
+    {
+        RPC_STATUS rc = UuidCreate((UUID *)pUuid);
+        if (   rc == RPC_S_OK
+            || rc == RPC_S_UUID_LOCAL_ONLY)
+            return VINF_SUCCESS;
+        AssertMsg(rc == RPC_S_UUID_NO_ADDRESS, ("UuidCreate -> %u (%#x)\n", rc, rc));
+    }
+
+    /*
+     * Use generic implementation as fallback (copy of RTUuidCreate-generic.cpp).
+     */
+    RTRandBytes(pUuid, sizeof(*pUuid));
+    pUuid->Gen.u8ClockSeqHiAndReserved = (pUuid->Gen.u8ClockSeqHiAndReserved & 0x3f) | 0x80;
+    pUuid->Gen.u16TimeHiAndVersion     = (pUuid->Gen.u16TimeHiAndVersion & 0x0fff) | 0x4000;
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/Runtime/r3/win/VBoxRT-msvcp100-win32.def b/src/VBox/Runtime/r3/win/VBoxRT-msvcp100-win32.def
new file mode 100644
index 00000000..5395dc50
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/VBoxRT-msvcp100-win32.def
@@ -0,0 +1,1678 @@
+
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+  ?do_get_weekday@?$time_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHPAUtm@@@Z
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+  ?do_get_weekday@?$time_get@_WV?$istreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@MBE?AV?$istreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@0AAVios_base@2@AAHPAUtm@@@Z
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+  ?do_get_year@?$time_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MBE?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AAVios_base@2@AAHPAUtm@@@Z
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+  ?do_in@?$codecvt@DDH@std@@MBEHAAHPBD1AAPBDPAD3AAPAD@Z
+  ?do_in@?$codecvt@GDH@std@@MBEHAAHPBD1AAPBDPAG3AAPAG@Z
+  ?do_in@?$codecvt@_WDH@std@@MBEHAAHPBD1AAPBDPA_W3AAPA_W@Z
+  ?do_is@?$ctype@G@std@@MBEPBGPBG0PAF@Z
+  ?do_is@?$ctype@G@std@@MBE_NFG@Z
+  ?do_is@?$ctype@_W@std@@MBEPB_WPB_W0PAF@Z
+  ?do_is@?$ctype@_W@std@@MBE_NF_W@Z
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+  ?do_max_length@?$codecvt@_WDH@std@@MBEHXZ
+  ?do_max_length@codecvt_base@std@@MBEHXZ
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+  ?do_narrow@?$ctype@G@std@@MBEDGD@Z
+  ?do_narrow@?$ctype@G@std@@MBEPBGPBG0DPAD@Z
+  ?do_narrow@?$ctype@_W@std@@MBED_WD@Z
+  ?do_narrow@?$ctype@_W@std@@MBEPB_WPB_W0DPAD@Z
+  ?do_out@?$codecvt@DDH@std@@MBEHAAHPBD1AAPBDPAD3AAPAD@Z
+  ?do_out@?$codecvt@GDH@std@@MBEHAAHPBG1AAPBGPAD3AAPAD@Z
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+  ?do_put@?$num_put@GV?$ostreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MBE?AV?$ostreambuf_iterator@GU?$char_traits@G@std@@@2@V32@AAVios_base@2@GO@Z
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+  ?do_put@?$num_put@GV?$ostreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MBE?AV?$ostreambuf_iterator@GU?$char_traits@G@std@@@2@V32@AAVios_base@2@G_K@Z
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+  ?do_put@?$time_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MBE?AV?$ostreambuf_iterator@DU?$char_traits@D@std@@@2@V32@AAVios_base@2@DPBUtm@@DD@Z
+  ?do_put@?$time_put@GV?$ostreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MBE?AV?$ostreambuf_iterator@GU?$char_traits@G@std@@@2@V32@AAVios_base@2@GPBUtm@@DD@Z
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+  ?do_scan_is@?$ctype@G@std@@MBEPBGFPBG0@Z
+  ?do_scan_is@?$ctype@_W@std@@MBEPB_WFPB_W0@Z
+  ?do_scan_not@?$ctype@G@std@@MBEPBGFPBG0@Z
+  ?do_scan_not@?$ctype@_W@std@@MBEPB_WFPB_W0@Z
+  ?do_tolower@?$ctype@D@std@@MBEDD@Z
+  ?do_tolower@?$ctype@D@std@@MBEPBDPADPBD@Z
+  ?do_tolower@?$ctype@G@std@@MBEGG@Z
+  ?do_tolower@?$ctype@G@std@@MBEPBGPAGPBG@Z
+  ?do_tolower@?$ctype@_W@std@@MBEPB_WPA_WPB_W@Z
+  ?do_tolower@?$ctype@_W@std@@MBE_W_W@Z
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+  ?do_toupper@?$ctype@D@std@@MBEPBDPADPBD@Z
+  ?do_toupper@?$ctype@G@std@@MBEGG@Z
+  ?do_toupper@?$ctype@G@std@@MBEPBGPAGPBG@Z
+  ?do_toupper@?$ctype@_W@std@@MBEPB_WPA_WPB_W@Z
+  ?do_toupper@?$ctype@_W@std@@MBE_W_W@Z
+  ?do_unshift@?$codecvt@DDH@std@@MBEHAAHPAD1AAPAD@Z
+  ?do_unshift@?$codecvt@GDH@std@@MBEHAAHPAD1AAPAD@Z
+  ?do_unshift@?$codecvt@_WDH@std@@MBEHAAHPAD1AAPAD@Z
+  ?do_widen@?$ctype@D@std@@MBEDD@Z
+  ?do_widen@?$ctype@D@std@@MBEPBDPBD0PAD@Z
+  ?do_widen@?$ctype@G@std@@MBEGD@Z
+  ?do_widen@?$ctype@G@std@@MBEPBDPBD0PAG@Z
+  ?do_widen@?$ctype@_W@std@@MBEPBDPBD0PA_W@Z
+  ?do_widen@?$ctype@_W@std@@MBE_WD@Z
+  ?done@agent@Concurrency@@IAE_NXZ
+  ?eback@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ
+  ?eback@?$basic_streambuf@GU?$char_traits@G@std@@@std@@IBEPAGXZ
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+  ?egptr@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ
+  ?egptr@?$basic_streambuf@GU?$char_traits@G@std@@@std@@IBEPAGXZ
+  ?egptr@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@IBEPA_WXZ
+  ?empty@?$_Yarn@D@std@@QBE_NXZ
+  ?empty@locale@std@@SA?AV12@XZ
+  ?encoding@codecvt_base@std@@QBEHXZ
+  ?endl@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@1@AAV21@@Z
+  ?endl@std@@YAAAV?$basic_ostream@GU?$char_traits@G@std@@@1@AAV21@@Z
+  ?endl@std@@YAAAV?$basic_ostream@_WU?$char_traits@_W@std@@@1@AAV21@@Z
+  ?ends@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@1@AAV21@@Z
+  ?ends@std@@YAAAV?$basic_ostream@GU?$char_traits@G@std@@@1@AAV21@@Z
+  ?ends@std@@YAAAV?$basic_ostream@_WU?$char_traits@_W@std@@@1@AAV21@@Z
+  ?eof@ios_base@std@@QBE_NXZ
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+  ?epptr@?$basic_streambuf@GU?$char_traits@G@std@@@std@@IBEPAGXZ
+  ?epptr@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@IBEPA_WXZ
+  ?epsilon@?$numeric_limits@C@std@@SACXZ
+  ?epsilon@?$numeric_limits@D@std@@SADXZ
+  ?epsilon@?$numeric_limits@E@std@@SAEXZ
+  ?epsilon@?$numeric_limits@F@std@@SAFXZ
+  ?epsilon@?$numeric_limits@G@std@@SAGXZ
+  ?epsilon@?$numeric_limits@H@std@@SAHXZ
+  ?epsilon@?$numeric_limits@I@std@@SAIXZ
+  ?epsilon@?$numeric_limits@J@std@@SAJXZ
+  ?epsilon@?$numeric_limits@K@std@@SAKXZ
+  ?epsilon@?$numeric_limits@M@std@@SAMXZ
+  ?epsilon@?$numeric_limits@N@std@@SANXZ
+  ?epsilon@?$numeric_limits@O@std@@SAOXZ
+  ?epsilon@?$numeric_limits@_J@std@@SA_JXZ
+  ?epsilon@?$numeric_limits@_K@std@@SA_KXZ
+  ?epsilon@?$numeric_limits@_N@std@@SA_NXZ
+  ?epsilon@?$numeric_limits@_W@std@@SA_WXZ
+  ?exceptions@ios_base@std@@QAEXH@Z
+  ?exceptions@ios_base@std@@QAEXI@Z
+  ?exceptions@ios_base@std@@QBEHXZ
+  ?fail@ios_base@std@@QBE_NXZ
+  ?fill@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEDD@Z
+  ?fill@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDXZ
+  ?fill@?$basic_ios@GU?$char_traits@G@std@@@std@@QAEGG@Z
+  ?fill@?$basic_ios@GU?$char_traits@G@std@@@std@@QBEGXZ
+  ?fill@?$basic_ios@_WU?$char_traits@_W@std@@@std@@QAE_W_W@Z
+  ?fill@?$basic_ios@_WU?$char_traits@_W@std@@@std@@QBE_WXZ
+  ?flags@ios_base@std@@QAEHH@Z
+  ?flags@ios_base@std@@QBEHXZ
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+  ?flush@?$basic_ostream@GU?$char_traits@G@std@@@std@@QAEAAV12@XZ
+  ?flush@?$basic_ostream@_WU?$char_traits@_W@std@@@std@@QAEAAV12@XZ
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+  ?gbump@?$basic_streambuf@GU?$char_traits@G@std@@@std@@IAEXH@Z
+  ?gbump@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@IAEXH@Z
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+  ?gcount@?$basic_istream@GU?$char_traits@G@std@@@std@@QBE_JXZ
+  ?gcount@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QBE_JXZ
+  ?generic_category@std@@YAABVerror_category@1@XZ
+  ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@AAD@Z
+  ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@AAV?$basic_streambuf@DU?$char_traits@D@std@@@2@@Z
+  ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@AAV?$basic_streambuf@DU?$char_traits@D@std@@@2@D@Z
+  ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@PAD_J@Z
+  ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@PAD_JD@Z
+  ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEHXZ
+  ?get@?$basic_istream@GU?$char_traits@G@std@@@std@@QAEAAV12@AAG@Z
+  ?get@?$basic_istream@GU?$char_traits@G@std@@@std@@QAEAAV12@AAV?$basic_streambuf@GU?$char_traits@G@std@@@2@@Z
+  ?get@?$basic_istream@GU?$char_traits@G@std@@@std@@QAEAAV12@AAV?$basic_streambuf@GU?$char_traits@G@std@@@2@G@Z
+  ?get@?$basic_istream@GU?$char_traits@G@std@@@std@@QAEAAV12@PAG_J@Z
+  ?get@?$basic_istream@GU?$char_traits@G@std@@@std@@QAEAAV12@PAG_JG@Z
+  ?get@?$basic_istream@GU?$char_traits@G@std@@@std@@QAEGXZ
+  ?get@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QAEAAV12@AAV?$basic_streambuf@_WU?$char_traits@_W@std@@@2@@Z
+  ?get@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QAEAAV12@AAV?$basic_streambuf@_WU?$char_traits@_W@std@@@2@_W@Z
+  ?get@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QAEAAV12@AA_W@Z
+  ?get@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QAEAAV12@PA_W_J@Z
+  ?get@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QAEAAV12@PA_W_J_W@Z
+  ?get@?$basic_istream@_WU?$char_traits@_W@std@@@std@@QAEGXZ
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAG@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAI@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAJ@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAK@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAM@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAN@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAO@Z
+  ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QBE?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AAVios_base@2@AAHAAPAX@Z
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+  ?xsgetn@?$basic_streambuf@GU?$char_traits@G@std@@@std@@MAE_JPAG_J@Z
+  ?xsgetn@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@MAE_JPA_W_J@Z
+  ?xsputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAE_JPBD_J@Z
+  ?xsputn@?$basic_streambuf@GU?$char_traits@G@std@@@std@@MAE_JPBG_J@Z
+  ?xsputn@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@MAE_JPB_W_J@Z
+  _Cosh
+  _Denorm
+  _Dnorm
+  _Dscale
+  _Dtest
+  _Eps
+  _Exp
+  _FCosh
+  _FDenorm
+  _FDnorm
+  _FDscale
+  _FDtest
+  _FEps
+  _FExp
+  _FInf
+  _FNan
+  _FRteps
+  _FSinh
+  _FSnan
+  _FXbig
+  _GetLocaleForCP
+  _Getcoll
+  _Getctype
+  _Getcvt
+  _Getdateorder
+  _Getwctype
+  _Getwctypes
+  _Hugeval
+  _Inf
+  _LCosh
+  _LDenorm
+  _LDscale
+  _LDtest
+  _LEps
+  _LExp
+  _LInf
+  _LNan
+  _LPoly
+  _LRteps
+  _LSinh
+  _LSnan
+  _LXbig
+  _LZero
+  _Mbrtowc
+  _Mtxdst
+  _Mtxinit
+  _Mtxlock
+  _Mtxunlock
+  _Nan
+  _Once
+  _Poly
+  _Rteps
+  _Sinh
+  _Snan
+  _Stod
+  _Stodx
+  _Stof
+  _Stofx
+  _Stold
+  _Stoldx
+  _Stoll
+  _Stollx
+  _Stolx
+  _Stoul
+  _Stoull
+  _Stoullx
+  _Stoulx
+  _Strcoll
+  _Strxfrm
+  _Tolower
+  _Toupper
+  _Towlower
+  _Towupper
+  _Wcrtomb
+  _Wcscoll
+  _Wcsxfrm
+  _Xbig
+  __Wcrtomb_lk
+  towctrans
+  wctrans
+  wctype
+
diff --git a/src/VBox/Runtime/r3/win/VBoxRT-msvcr100-win32.def b/src/VBox/Runtime/r3/win/VBoxRT-msvcr100-win32.def
new file mode 100644
index 00000000..6317e658
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/VBoxRT-msvcr100-win32.def
@@ -0,0 +1,1640 @@
+
+  ;
+  _except_handler4
+  ;_heap_init
+  ;__crtExitProcess
+  ;_NMSG_WRITE
+  ;_FF_MSGBANNER
+  ;_cinit
+  ;_setenvp
+  ;__crtGetEnvironmentStringsA
+  ;_ioinit
+  ;_mtinit
+
+  _initterm=my_initterm
+  __dllonexit=my_dllonexit
+  __getmainargs=my_getmainargs
+  __setusermatherr=my_setusermatherr
+
+  _onexit DATA ; the one is crazy. atonexit.obj in msvcrt.lib which calls the __imp___onexit directly.
+
+  ; MSVCR100.DLL exports
+  ??0?$_SpinWait@$0A@@details@Concurrency@@QAE@P6AXXZ@Z
+  ??0SchedulerPolicy@Concurrency@@QAA@IZZ
+  ??0SchedulerPolicy@Concurrency@@QAE@ABV01@@Z
+  ??0SchedulerPolicy@Concurrency@@QAE@XZ
+  ??0_NonReentrantBlockingLock@details@Concurrency@@QAE@XZ
+  ??0_NonReentrantPPLLock@details@Concurrency@@QAE@XZ
+  ??0_ReaderWriterLock@details@Concurrency@@QAE@XZ
+  ??0_ReentrantBlockingLock@details@Concurrency@@QAE@XZ
+  ??0_ReentrantLock@details@Concurrency@@QAE@XZ
+  ??0_ReentrantPPLLock@details@Concurrency@@QAE@XZ
+  ??0_Scoped_lock@_NonReentrantPPLLock@details@Concurrency@@QAE@AAV123@@Z
+  ??0_Scoped_lock@_ReentrantPPLLock@details@Concurrency@@QAE@AAV123@@Z
+  ??0_SpinLock@details@Concurrency@@QAE@ACJ@Z
+  ??0_TaskCollection@details@Concurrency@@QAE@XZ
+  ??0_Timer@details@Concurrency@@IAE@I_N@Z
+  ??0__non_rtti_object@std@@QAE@ABV01@@Z
+  ??0__non_rtti_object@std@@QAE@PBD@Z
+  ;fixme-not-in-libcmt.lib; ??0bad_cast@std@@AAE@PBQBD@Z
+  ??0bad_cast@std@@QAE@ABV01@@Z
+  ??0bad_cast@std@@QAE@PBD@Z
+  ??0bad_target@Concurrency@@QAE@PBD@Z
+  ??0bad_target@Concurrency@@QAE@XZ
+  ??0bad_typeid@std@@QAE@ABV01@@Z
+  ??0bad_typeid@std@@QAE@PBD@Z
+  ??0context_self_unblock@Concurrency@@QAE@PBD@Z
+  ??0context_self_unblock@Concurrency@@QAE@XZ
+  ??0context_unblock_unbalanced@Concurrency@@QAE@PBD@Z
+  ??0context_unblock_unbalanced@Concurrency@@QAE@XZ
+  ??0critical_section@Concurrency@@QAE@XZ
+  ??0default_scheduler_exists@Concurrency@@QAE@PBD@Z
+  ??0default_scheduler_exists@Concurrency@@QAE@XZ
+  ??0event@Concurrency@@QAE@XZ
+  ??0exception@std@@QAE@ABQBD@Z
+  ??0exception@std@@QAE@ABQBDH@Z
+  ??0exception@std@@QAE@ABV01@@Z
+  ??0exception@std@@QAE@XZ
+  ??0improper_lock@Concurrency@@QAE@PBD@Z
+  ??0improper_lock@Concurrency@@QAE@XZ
+  ??0improper_scheduler_attach@Concurrency@@QAE@PBD@Z
+  ??0improper_scheduler_attach@Concurrency@@QAE@XZ
+  ??0improper_scheduler_detach@Concurrency@@QAE@PBD@Z
+  ??0improper_scheduler_detach@Concurrency@@QAE@XZ
+  ??0improper_scheduler_reference@Concurrency@@QAE@PBD@Z
+  ??0improper_scheduler_reference@Concurrency@@QAE@XZ
+  ??0invalid_link_target@Concurrency@@QAE@PBD@Z
+  ??0invalid_link_target@Concurrency@@QAE@XZ
+  ??0invalid_multiple_scheduling@Concurrency@@QAE@PBD@Z
+  ??0invalid_multiple_scheduling@Concurrency@@QAE@XZ
+  ??0invalid_operation@Concurrency@@QAE@PBD@Z
+  ??0invalid_operation@Concurrency@@QAE@XZ
+  ??0invalid_oversubscribe_operation@Concurrency@@QAE@PBD@Z
+  ??0invalid_oversubscribe_operation@Concurrency@@QAE@XZ
+  ??0invalid_scheduler_policy_key@Concurrency@@QAE@PBD@Z
+  ??0invalid_scheduler_policy_key@Concurrency@@QAE@XZ
+  ??0invalid_scheduler_policy_thread_specification@Concurrency@@QAE@PBD@Z
+  ??0invalid_scheduler_policy_thread_specification@Concurrency@@QAE@XZ
+  ??0invalid_scheduler_policy_value@Concurrency@@QAE@PBD@Z
+  ??0invalid_scheduler_policy_value@Concurrency@@QAE@XZ
+  ??0message_not_found@Concurrency@@QAE@PBD@Z
+  ??0message_not_found@Concurrency@@QAE@XZ
+  ??0missing_wait@Concurrency@@QAE@PBD@Z
+  ??0missing_wait@Concurrency@@QAE@XZ
+  ??0nested_scheduler_missing_detach@Concurrency@@QAE@PBD@Z
+  ??0nested_scheduler_missing_detach@Concurrency@@QAE@XZ
+  ??0operation_timed_out@Concurrency@@QAE@PBD@Z
+  ??0operation_timed_out@Concurrency@@QAE@XZ
+  ??0reader_writer_lock@Concurrency@@QAE@XZ
+  ??0scheduler_not_attached@Concurrency@@QAE@PBD@Z
+  ??0scheduler_not_attached@Concurrency@@QAE@XZ
+  ??0scheduler_resource_allocation_error@Concurrency@@QAE@J@Z
+  ??0scheduler_resource_allocation_error@Concurrency@@QAE@PBDJ@Z
+  ??0scoped_lock@critical_section@Concurrency@@QAE@AAV12@@Z
+  ??0scoped_lock@reader_writer_lock@Concurrency@@QAE@AAV12@@Z
+  ??0scoped_lock_read@reader_writer_lock@Concurrency@@QAE@AAV12@@Z
+  ??0task_canceled@details@Concurrency@@QAE@PBD@Z
+  ??0task_canceled@details@Concurrency@@QAE@XZ
+  ??0unsupported_os@Concurrency@@QAE@PBD@Z
+  ??0unsupported_os@Concurrency@@QAE@XZ
+  ??1SchedulerPolicy@Concurrency@@QAE@XZ
+  ??1_NonReentrantBlockingLock@details@Concurrency@@QAE@XZ
+  ??1_ReentrantBlockingLock@details@Concurrency@@QAE@XZ
+  ??1_Scoped_lock@_NonReentrantPPLLock@details@Concurrency@@QAE@XZ
+  ??1_Scoped_lock@_ReentrantPPLLock@details@Concurrency@@QAE@XZ
+  ??1_SpinLock@details@Concurrency@@QAE@XZ
+  ??1_TaskCollection@details@Concurrency@@QAE@XZ
+  ??1_Timer@details@Concurrency@@IAE@XZ
+  ??1__non_rtti_object@std@@UAE@XZ
+  ??1bad_cast@std@@UAE@XZ
+  ??1bad_typeid@std@@UAE@XZ
+  ??1critical_section@Concurrency@@QAE@XZ
+  ??1event@Concurrency@@QAE@XZ
+  ??1exception@std@@UAE@XZ
+  ??1reader_writer_lock@Concurrency@@QAE@XZ
+  ??1scoped_lock@critical_section@Concurrency@@QAE@XZ
+  ??1scoped_lock@reader_writer_lock@Concurrency@@QAE@XZ
+  ??1scoped_lock_read@reader_writer_lock@Concurrency@@QAE@XZ
+  ??1type_info@@UAE@XZ
+  ??2@YAPAXI@Z
+  ??2@YAPAXIHPBDH@Z
+  ??3@YAXPAX@Z
+  ;fixme-not-in-libcmt.lib; ??4?$_SpinWait@$00@details@Concurrency@@QAEAAV012@ABV012@@Z
+  ;fixme-not-in-libcmt.lib; ??4?$_SpinWait@$0A@@details@Concurrency@@QAEAAV012@ABV012@@Z
+  ??4SchedulerPolicy@Concurrency@@QAEAAV01@ABV01@@Z
+  ??4__non_rtti_object@std@@QAEAAV01@ABV01@@Z
+  ??4bad_cast@std@@QAEAAV01@ABV01@@Z
+  ??4bad_typeid@std@@QAEAAV01@ABV01@@Z
+  ??4exception@std@@QAEAAV01@ABV01@@Z
+  ??8type_info@@QBE_NABV0@@Z
+  ??9type_info@@QBE_NABV0@@Z
+  ??_7__non_rtti_object@std@@6B@
+  ??_7bad_cast@std@@6B@
+  ??_7bad_typeid@std@@6B@
+  ;fixme-not-in-libcmt.lib; ??_7exception@@6B@
+  ??_7exception@std@@6B@
+  ;fixme-not-in-libcmt.lib; ??_F?$_SpinWait@$00@details@Concurrency@@QAEXXZ
+  ;fixme-not-in-libcmt.lib; ??_F?$_SpinWait@$0A@@details@Concurrency@@QAEXXZ
+  ??_Fbad_cast@std@@QAEXXZ
+  ??_Fbad_typeid@std@@QAEXXZ
+  ??_U@YAPAXI@Z
+  ??_U@YAPAXIHPBDH@Z
+  ??_V@YAXPAX@Z
+  ?Alloc@Concurrency@@YAPAXI@Z
+  ?Block@Context@Concurrency@@SAXXZ
+  ?Create@CurrentScheduler@Concurrency@@SAXABVSchedulerPolicy@2@@Z
+  ?Create@Scheduler@Concurrency@@SAPAV12@ABVSchedulerPolicy@2@@Z
+  ?CreateResourceManager@Concurrency@@YAPAUIResourceManager@1@XZ
+  ?CreateScheduleGroup@CurrentScheduler@Concurrency@@SAPAVScheduleGroup@2@XZ
+  ?CurrentContext@Context@Concurrency@@SAPAV12@XZ
+  ?Detach@CurrentScheduler@Concurrency@@SAXXZ
+  ?DisableTracing@Concurrency@@YAJXZ
+  ?EnableTracing@Concurrency@@YAJXZ
+  ?Free@Concurrency@@YAXPAX@Z
+  ?Get@CurrentScheduler@Concurrency@@SAPAVScheduler@2@XZ
+  ?GetExecutionContextId@Concurrency@@YAIXZ
+  ?GetNumberOfVirtualProcessors@CurrentScheduler@Concurrency@@SAIXZ
+  ?GetOSVersion@Concurrency@@YA?AW4OSVersion@IResourceManager@1@XZ
+  ?GetPolicy@CurrentScheduler@Concurrency@@SA?AVSchedulerPolicy@2@XZ
+  ?GetPolicyValue@SchedulerPolicy@Concurrency@@QBEIW4PolicyElementKey@2@@Z
+  ?GetProcessorCount@Concurrency@@YAIXZ
+  ?GetProcessorNodeCount@Concurrency@@YAIXZ
+  ?GetSchedulerId@Concurrency@@YAIXZ
+  ?GetSharedTimerQueue@details@Concurrency@@YAPAXXZ
+  ?Id@Context@Concurrency@@SAIXZ
+  ?Id@CurrentScheduler@Concurrency@@SAIXZ
+  ?IsCurrentTaskCollectionCanceling@Context@Concurrency@@SA_NXZ
+  ?Log2@details@Concurrency@@YAKI@Z
+  ?Oversubscribe@Context@Concurrency@@SAX_N@Z
+  ?RegisterShutdownEvent@CurrentScheduler@Concurrency@@SAXPAX@Z
+  ?ResetDefaultSchedulerPolicy@Scheduler@Concurrency@@SAXXZ
+  ?ScheduleGroupId@Context@Concurrency@@SAIXZ
+  ?ScheduleTask@CurrentScheduler@Concurrency@@SAXP6AXPAX@Z0@Z
+  ?SetConcurrencyLimits@SchedulerPolicy@Concurrency@@QAEXII@Z
+  ?SetDefaultSchedulerPolicy@Scheduler@Concurrency@@SAXABVSchedulerPolicy@2@@Z
+  ?SetPolicyValue@SchedulerPolicy@Concurrency@@QAEIW4PolicyElementKey@2@I@Z
+  ?VirtualProcessorId@Context@Concurrency@@SAIXZ
+  ?Yield@Context@Concurrency@@SAXXZ
+  ?_Abort@_StructuredTaskCollection@details@Concurrency@@AAEXXZ
+  ?_Acquire@_NonReentrantBlockingLock@details@Concurrency@@QAEXXZ
+  ?_Acquire@_NonReentrantPPLLock@details@Concurrency@@QAEXPAX@Z
+  ?_Acquire@_ReentrantBlockingLock@details@Concurrency@@QAEXXZ
+  ?_Acquire@_ReentrantLock@details@Concurrency@@QAEXXZ
+  ?_Acquire@_ReentrantPPLLock@details@Concurrency@@QAEXPAX@Z
+  ?_AcquireRead@_ReaderWriterLock@details@Concurrency@@QAEXXZ
+  ?_AcquireWrite@_ReaderWriterLock@details@Concurrency@@QAEXXZ
+  ?_Cancel@_StructuredTaskCollection@details@Concurrency@@QAEXXZ
+  ?_Cancel@_TaskCollection@details@Concurrency@@QAEXXZ
+  ?_CheckTaskCollection@_UnrealizedChore@details@Concurrency@@IAEXXZ
+  ?_ConcRT_Assert@details@Concurrency@@YAXPBD0H@Z
+  ?_ConcRT_CoreAssert@details@Concurrency@@YAXPBD0H@Z
+  ?_ConcRT_DumpMessage@details@Concurrency@@YAXPB_WZZ
+  ?_ConcRT_Trace@details@Concurrency@@YAXHPB_WZZ
+  ?_Copy_str@exception@std@@AAEXPBD@Z
+  ?_DoYield@?$_SpinWait@$00@details@Concurrency@@IAEXXZ
+  ?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IAEXXZ
+  ?_IsCanceling@_StructuredTaskCollection@details@Concurrency@@QAE_NXZ
+  ?_IsCanceling@_TaskCollection@details@Concurrency@@QAE_NXZ
+  ?_Name_base@type_info@@CAPBDPBV1@PAU__type_info_node@@@Z
+  ?_Name_base_internal@type_info@@CAPBDPBV1@PAU__type_info_node@@@Z
+  ?_NumberOfSpins@?$_SpinWait@$00@details@Concurrency@@IAEKXZ
+  ?_NumberOfSpins@?$_SpinWait@$0A@@details@Concurrency@@IAEKXZ
+  ?_Release@_NonReentrantBlockingLock@details@Concurrency@@QAEXXZ
+  ?_Release@_NonReentrantPPLLock@details@Concurrency@@QAEXXZ
+  ?_Release@_ReentrantBlockingLock@details@Concurrency@@QAEXXZ
+  ?_Release@_ReentrantLock@details@Concurrency@@QAEXXZ
+  ?_Release@_ReentrantPPLLock@details@Concurrency@@QAEXXZ
+  ?_ReleaseRead@_ReaderWriterLock@details@Concurrency@@QAEXXZ
+  ?_ReleaseWrite@_ReaderWriterLock@details@Concurrency@@QAEXXZ
+  ?_Reset@?$_SpinWait@$00@details@Concurrency@@IAEXXZ
+  ?_Reset@?$_SpinWait@$0A@@details@Concurrency@@IAEXXZ
+  ?_RunAndWait@_StructuredTaskCollection@details@Concurrency@@QAG?AW4_TaskCollectionStatus@23@PAV_UnrealizedChore@23@@Z
+  ?_RunAndWait@_TaskCollection@details@Concurrency@@QAG?AW4_TaskCollectionStatus@23@PAV_UnrealizedChore@23@@Z
+  ?_Schedule@_StructuredTaskCollection@details@Concurrency@@QAEXPAV_UnrealizedChore@23@@Z
+  ?_Schedule@_TaskCollection@details@Concurrency@@QAEXPAV_UnrealizedChore@23@@Z
+  ?_SetSpinCount@?$_SpinWait@$00@details@Concurrency@@QAEXI@Z
+  ?_SetSpinCount@?$_SpinWait@$0A@@details@Concurrency@@QAEXI@Z
+  ?_ShouldSpinAgain@?$_SpinWait@$00@details@Concurrency@@IAE_NXZ
+  ?_ShouldSpinAgain@?$_SpinWait@$0A@@details@Concurrency@@IAE_NXZ
+  ?_SpinOnce@?$_SpinWait@$00@details@Concurrency@@QAE_NXZ
+  ?_SpinOnce@?$_SpinWait@$0A@@details@Concurrency@@QAE_NXZ
+  ?_SpinYield@Context@Concurrency@@SAXXZ
+  ?_Start@_Timer@details@Concurrency@@IAEXXZ
+  ?_Stop@_Timer@details@Concurrency@@IAEXXZ
+  ?_Tidy@exception@std@@AAEXXZ
+  ?_Trace_ppl_function@Concurrency@@YAXABU_GUID@@EW4ConcRT_EventType@1@@Z
+  ?_TryAcquire@_NonReentrantBlockingLock@details@Concurrency@@QAE_NXZ
+  ?_TryAcquire@_ReentrantBlockingLock@details@Concurrency@@QAE_NXZ
+  ?_TryAcquire@_ReentrantLock@details@Concurrency@@QAE_NXZ
+  ?_TryAcquireWrite@_ReaderWriterLock@details@Concurrency@@QAE_NXZ
+  ?_Type_info_dtor@type_info@@CAXPAV1@@Z
+  ?_Type_info_dtor_internal@type_info@@CAXPAV1@@Z
+  ?_UnderlyingYield@details@Concurrency@@YAXXZ
+  ?_ValidateExecute@@YAHP6GHXZ@Z
+  ?_ValidateRead@@YAHPBXI@Z
+  ?_ValidateWrite@@YAHPAXI@Z
+  ?_Value@_SpinCount@details@Concurrency@@SAIXZ
+  ?__ExceptionPtrAssign@@YAXPAXPBX@Z
+  ?__ExceptionPtrCompare@@YA_NPBX0@Z
+  ?__ExceptionPtrCopy@@YAXPAXPBX@Z
+  ?__ExceptionPtrCopyException@@YAXPAXPBX1@Z
+  ?__ExceptionPtrCreate@@YAXPAX@Z
+  ?__ExceptionPtrCurrentException@@YAXPAX@Z
+  ?__ExceptionPtrDestroy@@YAXPAX@Z
+  ?__ExceptionPtrRethrow@@YAXPBX@Z
+  __uncaught_exception
+  ?_inconsistency@@YAXXZ
+  ?_invalid_parameter@@YAXPBG00II@Z
+  ?_is_exception_typeof@@YAHABVtype_info@@PAU_EXCEPTION_POINTERS@@@Z
+  ?_name_internal_method@type_info@@QBEPBDPAU__type_info_node@@@Z
+  ?_open@@YAHPBDHH@Z
+  ?_query_new_handler@@YAP6AHI@ZXZ
+  ?_query_new_mode@@YAHXZ
+  ?_set_new_handler@@YAP6AHI@ZH@Z
+  ?_set_new_handler@@YAP6AHI@ZP6AHI@Z@Z
+  ?_set_new_mode@@YAHH@Z
+  ?_set_se_translator@@YAP6AXIPAU_EXCEPTION_POINTERS@@@ZH@Z
+  ?_set_se_translator@@YAP6AXIPAU_EXCEPTION_POINTERS@@@ZP6AXI0@Z@Z
+  ?_sopen@@YAHPBDHHH@Z
+  ?_type_info_dtor_internal_method@type_info@@QAEXXZ
+  ?_wopen@@YAHPB_WHH@Z
+  ?_wsopen@@YAHPB_WHHH@Z
+  ?before@type_info@@QBEHABV1@@Z
+  ?get_error_code@scheduler_resource_allocation_error@Concurrency@@QBEJXZ
+  ?lock@critical_section@Concurrency@@QAEXXZ
+  ?lock@reader_writer_lock@Concurrency@@QAEXXZ
+  ?lock_read@reader_writer_lock@Concurrency@@QAEXXZ
+  ?name@type_info@@QBEPBDPAU__type_info_node@@@Z
+  ?native_handle@critical_section@Concurrency@@QAEAAV12@XZ
+  ?raw_name@type_info@@QBEPBDXZ
+  ?reset@event@Concurrency@@QAEXXZ
+  ?set@event@Concurrency@@QAEXXZ
+  ?set_new_handler@@YAP6AXXZP6AXXZ@Z
+  ?set_terminate@@YAP6AXXZH@Z
+  ?set_terminate@@YAP6AXXZP6AXXZ@Z
+  ?set_unexpected@@YAP6AXXZH@Z
+  ?set_unexpected@@YAP6AXXZP6AXXZ@Z
+  ?swprintf@@YAHPAGIPBGZZ
+  ?swprintf@@YAHPA_WIPB_WZZ
+  ?terminate@@YAXXZ ;fixme-causes-trouble-with-version-in-libcmt.lib;
+  ?try_lock@critical_section@Concurrency@@QAE_NXZ
+  ?try_lock@reader_writer_lock@Concurrency@@QAE_NXZ
+  ?try_lock_read@reader_writer_lock@Concurrency@@QAE_NXZ
+  ?unexpected@@YAXXZ
+  ?unlock@critical_section@Concurrency@@QAEXXZ
+  ?unlock@reader_writer_lock@Concurrency@@QAEXXZ
+  ?vswprintf@@YAHPA_WIPB_WPAD@Z
+  ?wait@Concurrency@@YAXI@Z
+  ?wait@event@Concurrency@@QAEII@Z
+  ?wait_for_multiple@event@Concurrency@@SAIPAPAV12@I_NI@Z
+  ?what@exception@std@@UBEPBDXZ
+  $I10_OUTPUT
+  _CIacos
+  _CIasin
+  _CIatan
+  _CIatan2
+  _CIcos
+  _CIcosh
+  _CIexp
+  _CIfmod
+  _CIlog
+  _CIlog10
+  _CIpow
+  _CIsin
+  _CIsinh
+  _CIsqrt
+  _CItan
+  _CItanh
+  _CRT_RTC_INIT
+  _CRT_RTC_INITW
+  _CreateFrameInfo
+  _CxxThrowException
+  _EH_prolog
+  _FindAndUnlinkFrame
+  _Getdays
+  _Getmonths
+  _Gettnames
+  _HUGE
+  _IsExceptionObjectToBeDestroyed
+  _NLG_Dispatch2
+  _NLG_Return
+  _NLG_Return2
+  _Strftime
+  _XcptFilter
+  __AdjustPointer
+  __BuildCatchObject
+  __BuildCatchObjectHelper
+  __CppXcptFilter
+  __CxxCallUnwindDelDtor
+  __CxxCallUnwindDtor
+  __CxxCallUnwindStdDelDtor
+  __CxxCallUnwindVecDtor
+  __CxxDetectRethrow
+  __CxxExceptionFilter
+  __CxxFrameHandler
+  __CxxFrameHandler2
+  __CxxFrameHandler3
+  __CxxLongjmpUnwind
+  __CxxQueryExceptionSize
+  __CxxRegisterExceptionObject
+  __CxxUnregisterExceptionObject
+  __DestructExceptionObject
+  __FrameUnwindFilter
+  __RTCastToVoid
+  __RTDynamicCast
+  __RTtypeid
+  __STRINGTOLD
+  __STRINGTOLD_L
+  __TypeMatch
+  ___lc_codepage_func
+  ___lc_collate_cp_func
+  ___lc_handle_func
+  ___mb_cur_max_func
+  ___mb_cur_max_l_func
+  ___setlc_active_func
+  ___unguarded_readlc_active_add_func
+  __argc
+  __argv
+  __badioinfo
+  __clean_type_info_names_internal
+  __control87_2
+  __create_locale
+  __crtCompareStringA
+  __crtCompareStringW
+  __crtLCMapStringA
+  __crtLCMapStringW
+  __daylight
+  __doserrno
+  __dstbias
+  ___fls_getvalue@4
+  ___fls_setvalue@8
+  __fpecode
+  __free_locale
+  __get_current_locale
+  __get_flsindex
+ ;fixme?; __get_tlsindex
+  __initenv
+  __iob_func
+  __isascii
+  __iscsym
+  __iscsymf
+  __iswcsym
+  __iswcsymf
+  __lconv
+  __lconv_init
+  __libm_sse2_acos
+  __libm_sse2_acosf
+  __libm_sse2_asin
+  __libm_sse2_asinf
+  __libm_sse2_atan
+  __libm_sse2_atan2
+  __libm_sse2_atanf
+  __libm_sse2_cos
+  __libm_sse2_cosf
+  __libm_sse2_exp
+  __libm_sse2_expf
+  __libm_sse2_log
+  __libm_sse2_log10
+  __libm_sse2_log10f
+  __libm_sse2_logf
+  __libm_sse2_pow
+  __libm_sse2_powf
+  __libm_sse2_sin
+  __libm_sse2_sinf
+  __libm_sse2_tan
+  __libm_sse2_tanf
+  __mb_cur_max
+ ;fixme?; __p___argc
+ ;fixme?; __p___argv
+ ;fixme?; __p___initenv
+ ;fixme?; __p___mb_cur_max
+ ;fixme?; __p___wargv
+ ;fixme?; __p___winitenv
+ ;fixme?; __p__acmdln
+ ;fixme?; __p__commode
+ ;fixme?; __p__daylight
+ ;fixme?; __p__dstbias
+ ;fixme?; __p__environ
+ ;fixme?; __p__fmode
+ ;fixme?; __p__iob
+ ;fixme?; __p__mbcasemap
+ ;fixme?; __p__mbctype
+ ;fixme?; __p__pctype
+ ;fixme?; __p__pgmptr
+ ;fixme?; __p__pwctype
+ ;fixme?; __p__timezone
+ ;fixme?; __p__tzname
+ ;fixme?; __p__wcmdln
+ ;fixme?; __p__wenviron
+ ;fixme?; __p__wpgmptr
+
+  __pctype_func
+  __pioinfo
+  __pwctype_func
+  __pxcptinfoptrs
+  __report_gsfailure
+  __set_app_type
+  __set_flsgetvalue
+  __setlc_active
+ ;fixme?; __setusermatherr
+  __strncnt
+  __swprintf_l
+  __sys_errlist
+  __sys_nerr
+  __threadhandle
+  __threadid
+  __timezone
+  __toascii
+  __tzname
+  __unDName
+  __unDNameEx
+  __unDNameHelper
+  __unguarded_readlc_active
+  __vswprintf_l
+  __wargv
+  __wcserror
+  __wcserror_s
+  __wcsncnt
+ ;fixme?; __wgetmainargs
+  __winitenv
+  _abnormal_termination
+  _abs64
+  _access
+  _access_s
+  _acmdln
+  _aligned_free
+  _aligned_malloc
+  _aligned_msize
+  _aligned_offset_malloc
+  _aligned_offset_realloc
+  _aligned_offset_recalloc
+  _aligned_realloc
+  _aligned_recalloc
+  _amsg_exit
+  _assert
+  _atodbl
+  _atodbl_l
+  _atof_l
+  _atoflt
+  _atoflt_l
+  _atoi64
+  _atoi64_l
+  _atoi_l
+  _atol_l
+  _atoldbl
+  _atoldbl_l
+  _beep
+  _beginthread
+  _beginthreadex
+  _byteswap_uint64
+  _byteswap_ulong
+  _byteswap_ushort
+  _c_exit
+  _cabs
+  _callnewh
+  _calloc_crt
+  _cexit
+  _cgets
+  _cgets_s
+  _cgetws
+  _cgetws_s
+  _chdir
+  _chdrive
+  _chgsign
+  _chkesp
+  _chmod
+  _chsize
+  _chsize_s
+  _clearfp
+  _close
+  _commit
+  ;fixme?; _commode
+  _configthreadlocale
+  _control87
+  _controlfp
+  _controlfp_s
+  _copysign
+  _cprintf
+  _cprintf_l
+  _cprintf_p
+  _cprintf_p_l
+  _cprintf_s
+  _cprintf_s_l
+  _cputs
+  _cputws
+  _creat
+  _create_locale
+  _crt_debugger_hook
+  _cscanf
+  _cscanf_l
+  _cscanf_s
+  _cscanf_s_l
+  _ctime32
+  _ctime32_s
+  _ctime64
+  _ctime64_s
+  _cwait
+  _cwprintf
+  _cwprintf_l
+  _cwprintf_p
+  _cwprintf_p_l
+  _cwprintf_s
+  _cwprintf_s_l
+  _cwscanf
+  _cwscanf_l
+  _cwscanf_s
+  _cwscanf_s_l
+  _daylight
+  _difftime32
+  _difftime64
+  _dosmaperr
+  _dstbias
+  _dup
+  _dup2
+  _dupenv_s
+  _ecvt
+  _ecvt_s
+  _encoded_null
+  _endthread
+  _endthreadex
+  _environ
+  _eof
+  _errno
+  _except_handler2
+  _except_handler3
+ ;fixme?; _except_handler4_common
+  _execl
+  _execle
+  _execlp
+  _execlpe
+  _execv
+  _execve
+  _execvp
+  _execvpe
+  _exit
+  _expand
+  _fclose_nolock
+  _fcloseall
+  _fcvt
+  _fcvt_s
+  _fdopen
+  _fflush_nolock
+  _fgetchar
+  _fgetwc_nolock
+  _fgetwchar
+  _filbuf
+  _filelength
+  _filelengthi64
+  _fileno
+  _findclose
+  _findfirst32
+  _findfirst32i64
+  _findfirst64
+  _findfirst64i32
+  _findnext32
+  _findnext32i64
+  _findnext64
+  _findnext64i32
+  _finite
+  _flsbuf
+  _flushall
+  ;fixme?; _fmode
+  _fpclass
+  _fpieee_flt
+  _fpreset
+  _fprintf_l
+  _fprintf_p
+  _fprintf_p_l
+  _fprintf_s_l
+  _fputchar
+  _fputwc_nolock
+  _fputwchar
+  _fread_nolock
+  _fread_nolock_s
+  _free_locale
+  _freea
+  _freea_s
+  _freefls
+  _fscanf_l
+  _fscanf_s_l
+  _fseek_nolock
+  _fseeki64
+  _fseeki64_nolock
+  _fsopen
+  _fstat32
+  _fstat32i64
+  _fstat64
+  _fstat64i32
+  _ftell_nolock
+  _ftelli64
+  _ftelli64_nolock
+  _ftime32
+  _ftime32_s
+  _ftime64
+  _ftime64_s
+  _ftol
+  _fullpath
+  _futime32
+  _futime64
+  _fwprintf_l
+  _fwprintf_p
+  _fwprintf_p_l
+  _fwprintf_s_l
+  _fwrite_nolock
+  _fwscanf_l
+  _fwscanf_s_l
+  _gcvt
+  _gcvt_s
+  _get_current_locale
+  _get_daylight
+  _get_doserrno
+  _get_dstbias
+  _get_errno
+  _get_fmode
+  _get_heap_handle
+  _get_invalid_parameter_handler
+  _get_osfhandle
+  _get_output_format
+  _get_pgmptr
+  _get_printf_count_output
+  _get_purecall_handler
+  _get_terminate
+  _get_timezone
+  _get_tzname
+  _get_unexpected
+  _get_wpgmptr
+  _getc_nolock
+  _getch
+  _getch_nolock
+  _getche
+  _getche_nolock
+  _getcwd
+  _getdcwd
+  _getdcwd_nolock
+  _getdiskfree
+  _getdllprocaddr
+  _getdrive
+  _getdrives
+  _getmaxstdio
+  _getmbcp
+  _getpid
+  _getptd
+  _getsystime
+  _getw
+  _getwch
+  _getwch_nolock
+  _getwche
+  _getwche_nolock
+  _getws
+  _getws_s
+  _global_unwind2
+  _gmtime32
+  _gmtime32_s
+  _gmtime64
+  _gmtime64_s
+  _heapadd
+  _heapchk
+  _heapmin
+  _heapset
+  _heapused
+  _heapwalk
+  _hypot
+  _hypotf
+  _i64toa
+  _i64toa_s
+  _i64tow
+  _i64tow_s
+  _initptd
+ ;fixme?; _initterm
+  _initterm_e
+  _inp
+  _inpd
+  _inpw
+  _invalid_parameter
+  _invalid_parameter_noinfo
+  _invalid_parameter_noinfo_noreturn
+  _invoke_watson
+  _iob
+  _isalnum_l
+  _isalpha_l
+  _isatty
+  _iscntrl_l
+  _isctype
+  _isctype_l
+  _isdigit_l
+  _isgraph_l
+  _isleadbyte_l
+  _islower_l
+  _ismbbalnum
+  _ismbbalnum_l
+  _ismbbalpha
+  _ismbbalpha_l
+  _ismbbgraph
+  _ismbbgraph_l
+  _ismbbkalnum
+  _ismbbkalnum_l
+  _ismbbkana
+  _ismbbkana_l
+  _ismbbkprint
+  _ismbbkprint_l
+  _ismbbkpunct
+  _ismbbkpunct_l
+  _ismbblead
+  _ismbblead_l
+  _ismbbprint
+  _ismbbprint_l
+  _ismbbpunct
+  _ismbbpunct_l
+  _ismbbtrail
+  _ismbbtrail_l
+  _ismbcalnum
+  _ismbcalnum_l
+  _ismbcalpha
+  _ismbcalpha_l
+  _ismbcdigit
+  _ismbcdigit_l
+  _ismbcgraph
+  _ismbcgraph_l
+  _ismbchira
+  _ismbchira_l
+  _ismbckata
+  _ismbckata_l
+  _ismbcl0
+  _ismbcl0_l
+  _ismbcl1
+  _ismbcl1_l
+  _ismbcl2
+  _ismbcl2_l
+  _ismbclegal
+  _ismbclegal_l
+  _ismbclower
+  _ismbclower_l
+  _ismbcprint
+  _ismbcprint_l
+  _ismbcpunct
+  _ismbcpunct_l
+  _ismbcspace
+  _ismbcspace_l
+  _ismbcsymbol
+  _ismbcsymbol_l
+  _ismbcupper
+  _ismbcupper_l
+  _ismbslead
+  _ismbslead_l
+  _ismbstrail
+  _ismbstrail_l
+  _isnan
+  _isprint_l
+  _ispunct_l
+  _isspace_l
+  _isupper_l
+  _iswalnum_l
+  _iswalpha_l
+  _iswcntrl_l
+  _iswcsym_l
+  _iswcsymf_l
+  _iswctype_l
+  _iswdigit_l
+  _iswgraph_l
+  _iswlower_l
+  _iswprint_l
+  _iswpunct_l
+  _iswspace_l
+  _iswupper_l
+  _iswxdigit_l
+  _isxdigit_l
+  _itoa
+  _itoa_s
+  _itow
+  _itow_s
+  _j0
+  _j1
+  _jn
+  _kbhit
+  _lfind
+  _lfind_s
+  _loaddll
+  _local_unwind2
+  _local_unwind4
+  _localtime32
+  _localtime32_s
+  _localtime64
+  _localtime64_s
+  _lock
+  _lock_file
+  _locking
+  _logb
+  _longjmpex
+  _lrotl
+  _lrotr
+  _lsearch
+  _lsearch_s
+  _lseek
+  _lseeki64
+  _ltoa
+  _ltoa_s
+  _ltow
+  _ltow_s
+  _makepath
+  _makepath_s
+  _malloc_crt
+  _mbbtombc
+  _mbbtombc_l
+  _mbbtype
+  _mbbtype_l
+  _mbcasemap
+  _mbccpy
+  _mbccpy_l
+  _mbccpy_s
+  _mbccpy_s_l
+  _mbcjistojms
+  _mbcjistojms_l
+  _mbcjmstojis
+  _mbcjmstojis_l
+  _mbclen
+  _mbclen_l
+  _mbctohira
+  _mbctohira_l
+  _mbctokata
+  _mbctokata_l
+  _mbctolower
+  _mbctolower_l
+  _mbctombb
+  _mbctombb_l
+  _mbctoupper
+  _mbctoupper_l
+  _mbctype
+  _mblen_l
+  _mbsbtype
+  _mbsbtype_l
+  _mbscat_s
+  _mbscat_s_l
+  _mbschr
+  _mbschr_l
+  _mbscmp
+  _mbscmp_l
+  _mbscoll
+  _mbscoll_l
+  _mbscpy_s
+  _mbscpy_s_l
+  _mbscspn
+  _mbscspn_l
+  _mbsdec
+  _mbsdec_l
+  _mbsicmp
+  _mbsicmp_l
+  _mbsicoll
+  _mbsicoll_l
+  _mbsinc
+  _mbsinc_l
+  _mbslen
+  _mbslen_l
+  _mbslwr
+  _mbslwr_l
+  _mbslwr_s
+  _mbslwr_s_l
+  _mbsnbcat
+  _mbsnbcat_l
+  _mbsnbcat_s
+  _mbsnbcat_s_l
+  _mbsnbcmp
+  _mbsnbcmp_l
+  _mbsnbcnt
+  _mbsnbcnt_l
+  _mbsnbcoll
+  _mbsnbcoll_l
+  _mbsnbcpy
+  _mbsnbcpy_l
+  _mbsnbcpy_s
+  _mbsnbcpy_s_l
+  _mbsnbicmp
+  _mbsnbicmp_l
+  _mbsnbicoll
+  _mbsnbicoll_l
+  _mbsnbset
+  _mbsnbset_l
+  _mbsnbset_s
+  _mbsnbset_s_l
+  _mbsncat
+  _mbsncat_l
+  _mbsncat_s
+  _mbsncat_s_l
+  _mbsnccnt
+  _mbsnccnt_l
+  _mbsncmp
+  _mbsncmp_l
+  _mbsncoll
+  _mbsncoll_l
+  _mbsncpy
+  _mbsncpy_l
+  _mbsncpy_s
+  _mbsncpy_s_l
+  _mbsnextc
+  _mbsnextc_l
+  _mbsnicmp
+  _mbsnicmp_l
+  _mbsnicoll
+  _mbsnicoll_l
+  _mbsninc
+  _mbsninc_l
+  _mbsnlen
+  _mbsnlen_l
+  _mbsnset
+  _mbsnset_l
+  _mbsnset_s
+  _mbsnset_s_l
+  _mbspbrk
+  _mbspbrk_l
+  _mbsrchr
+  _mbsrchr_l
+  _mbsrev
+  _mbsrev_l
+  _mbsset
+  _mbsset_l
+  _mbsset_s
+  _mbsset_s_l
+  _mbsspn
+  _mbsspn_l
+  _mbsspnp
+  _mbsspnp_l
+  _mbsstr
+  _mbsstr_l
+  _mbstok
+  _mbstok_l
+  _mbstok_s
+  _mbstok_s_l
+  _mbstowcs_l
+  _mbstowcs_s_l
+  _mbstrlen
+  _mbstrlen_l
+  _mbstrnlen
+  _mbstrnlen_l
+  _mbsupr
+  _mbsupr_l
+  _mbsupr_s
+  _mbsupr_s_l
+  _mbtowc_l
+  _memccpy
+  _memicmp
+  _memicmp_l
+  _mkdir
+  _mkgmtime32
+  _mkgmtime64
+  _mktemp
+  _mktemp_s
+  _mktime32
+  _mktime64
+  _msize
+  _nextafter
+  _open
+  _open_osfhandle
+  _outp
+  _outpd
+  _outpw
+  _pclose
+  _pctype
+  _pgmptr
+  _pipe
+  _popen
+  _printf_l
+  _printf_p
+  _printf_p_l
+  _printf_s_l
+  _purecall
+  _putch
+  _putch_nolock
+  _putenv
+  _putenv_s
+  _putw
+  _putwch
+  _putwch_nolock
+  _putws
+  _pwctype
+  _read
+  _realloc_crt
+  _recalloc
+  _recalloc_crt
+  _resetstkoflw
+  _rmdir
+  _rmtmp
+  _rotl
+  _rotl64
+  _rotr
+  _rotr64
+  _scalb
+  _scanf_l
+  _scanf_s_l
+  _scprintf
+  _scprintf_l
+  _scprintf_p
+  _scprintf_p_l
+  _scwprintf
+  _scwprintf_l
+  _scwprintf_p
+  _scwprintf_p_l
+  _searchenv
+  _searchenv_s
+  _seh_longjmp_unwind4
+  _seh_longjmp_unwind
+  _set_SSE2_enable
+  _set_abort_behavior
+  _set_controlfp
+  _set_doserrno
+  _set_errno
+  _set_error_mode
+  _set_fmode
+  _set_invalid_parameter_handler
+  _set_malloc_crt_max_wait
+  _set_output_format
+  _set_printf_count_output
+  _set_purecall_handler
+  _seterrormode
+  _setjmp
+  _setjmp3
+  _setmaxstdio
+  _setmbcp
+  _setmode
+  _setsystime
+  _sleep
+  _snprintf
+  _snprintf_c
+  _snprintf_c_l
+  _snprintf_l
+  _snprintf_s
+  _snprintf_s_l
+  _snscanf
+  _snscanf_l
+  _snscanf_s
+  _snscanf_s_l
+  _snwprintf
+  _snwprintf_l
+  _snwprintf_s
+  _snwprintf_s_l
+  _snwscanf
+  _snwscanf_l
+  _snwscanf_s
+  _snwscanf_s_l
+  _sopen
+  _sopen_s
+  _spawnl
+  _spawnle
+  _spawnlp
+  _spawnlpe
+  _spawnv
+  _spawnve
+  _spawnvp
+  _spawnvpe
+  _splitpath
+  _splitpath_s
+  _sprintf_l
+  _sprintf_p
+  _sprintf_p_l
+  _sprintf_s_l
+  _sscanf_l
+  _sscanf_s_l
+  _stat32
+  _stat32i64
+  _stat64
+  _stat64i32
+  _statusfp
+  _statusfp2
+  _strcoll_l
+  _strdate
+  _strdate_s
+  _strdup
+  _strerror
+  _strerror_s
+  _strftime_l
+  _stricmp
+  _stricmp_l
+  _stricoll
+  _stricoll_l
+  _strlwr
+  _strlwr_l
+  _strlwr_s
+  _strlwr_s_l
+  _strncoll
+  _strncoll_l
+  _strnicmp
+  _strnicmp_l
+  _strnicoll
+  _strnicoll_l
+  _strnset
+  _strnset_s
+  _strrev
+  _strset
+  _strset_s
+  _strtime
+  _strtime_s
+  _strtod_l
+  _strtoi64
+  _strtoi64_l
+  _strtol_l
+  _strtoui64
+  _strtoui64_l
+  _strtoul_l
+  _strupr
+  _strupr_l
+  _strupr_s
+  _strupr_s_l
+  _strxfrm_l
+  _swab
+  _swprintf
+  _swprintf_c
+  _swprintf_c_l
+  _swprintf_p
+  _swprintf_p_l
+  _swprintf_s_l
+  _swscanf_l
+  _swscanf_s_l
+  _sys_errlist
+  _sys_nerr
+  _tell
+  _telli64
+  _tempnam
+  _time32
+  _time64
+  _timezone
+  _tolower
+  _tolower_l
+  _toupper
+  _toupper_l
+  _towlower_l
+  _towupper_l
+  _tzname
+  _tzset
+  _ui64toa
+  _ui64toa_s
+  _ui64tow
+  _ui64tow_s
+  _ultoa
+  _ultoa_s
+  _ultow
+  _ultow_s
+  _umask
+  _umask_s
+  _ungetc_nolock
+  _ungetch
+  _ungetch_nolock
+  _ungetwc_nolock
+  _ungetwch
+  _ungetwch_nolock
+  _unlink
+  _unloaddll
+  _unlock
+  _unlock_file
+  _utime32
+  _utime64
+  _vcprintf
+  _vcprintf_l
+  _vcprintf_p
+  _vcprintf_p_l
+  _vcprintf_s
+  _vcprintf_s_l
+  _vcwprintf
+  _vcwprintf_l
+  _vcwprintf_p
+  _vcwprintf_p_l
+  _vcwprintf_s
+  _vcwprintf_s_l
+  _vfprintf_l
+  _vfprintf_p
+  _vfprintf_p_l
+  _vfprintf_s_l
+  _vfwprintf_l
+  _vfwprintf_p
+  _vfwprintf_p_l
+  _vfwprintf_s_l
+  _vprintf_l
+  _vprintf_p
+  _vprintf_p_l
+  _vprintf_s_l
+  _vscprintf
+  _vscprintf_l
+  _vscprintf_p
+  _vscprintf_p_l
+  _vscwprintf
+  _vscwprintf_l
+  _vscwprintf_p
+  _vscwprintf_p_l
+  _vsnprintf
+  _vsnprintf_c
+  _vsnprintf_c_l
+  _vsnprintf_l
+  _vsnprintf_s
+  _vsnprintf_s_l
+  _vsnwprintf
+  _vsnwprintf_l
+  _vsnwprintf_s
+  _vsnwprintf_s_l
+  _vsprintf_l
+  _vsprintf_p
+  _vsprintf_p_l
+  _vsprintf_s_l
+  _vswprintf
+  _vswprintf_c
+  _vswprintf_c_l
+  _vswprintf_l
+  _vswprintf_p
+  _vswprintf_p_l
+  _vswprintf_s_l
+  _vwprintf_l
+  _vwprintf_p
+  _vwprintf_p_l
+  _vwprintf_s_l
+  _waccess
+  _waccess_s
+  _wasctime
+  _wasctime_s
+  _wassert
+  _wchdir
+  _wchmod
+ ;fixme?; _wcmdln
+  _wcreat
+  _wcscoll_l
+  _wcsdup
+  _wcserror
+  _wcserror_s
+  _wcsftime_l
+  _wcsicmp
+  _wcsicmp_l
+  _wcsicoll
+  _wcsicoll_l
+  _wcslwr
+  _wcslwr_l
+  _wcslwr_s
+  _wcslwr_s_l
+  _wcsncoll
+  _wcsncoll_l
+  _wcsnicmp
+  _wcsnicmp_l
+  _wcsnicoll
+  _wcsnicoll_l
+  _wcsnset
+  _wcsnset_s
+  _wcsrev
+  _wcsset
+  _wcsset_s
+  _wcstod_l
+  _wcstoi64
+  _wcstoi64_l
+  _wcstol_l
+  _wcstombs_l
+  _wcstombs_s_l
+  _wcstoui64
+  _wcstoui64_l
+  _wcstoul_l
+  _wcsupr
+  _wcsupr_l
+  _wcsupr_s
+  _wcsupr_s_l
+  _wcsxfrm_l
+  _wctime32
+  _wctime32_s
+  _wctime64
+  _wctime64_s
+  _wctomb_l
+  _wctomb_s_l
+  _wctype
+  _wdupenv_s
+  _wenviron
+  _wexecl
+  _wexecle
+  _wexeclp
+  _wexeclpe
+  _wexecv
+  _wexecve
+  _wexecvp
+  _wexecvpe
+  _wfdopen
+  _wfindfirst32
+  _wfindfirst32i64
+  _wfindfirst64
+  _wfindfirst64i32
+  _wfindnext32
+  _wfindnext32i64
+  _wfindnext64
+  _wfindnext64i32
+  _wfopen
+  _wfopen_s
+  _wfreopen
+  _wfreopen_s
+  _wfsopen
+  _wfullpath
+  _wgetcwd
+  _wgetdcwd
+  _wgetdcwd_nolock
+  _wgetenv
+  _wgetenv_s
+  _wmakepath
+  _wmakepath_s
+  _wmkdir
+  _wmktemp
+  _wmktemp_s
+  _wopen
+  _wperror
+  _wpgmptr
+  _wpopen
+  _wprintf_l
+  _wprintf_p
+  _wprintf_p_l
+  _wprintf_s_l
+  _wputenv
+  _wputenv_s
+  _wremove
+  _wrename
+  _write
+  _wrmdir
+  _wscanf_l
+  _wscanf_s_l
+  _wsearchenv
+  _wsearchenv_s
+  _wsetlocale
+  _wsopen
+  _wsopen_s
+  _wspawnl
+  _wspawnle
+  _wspawnlp
+  _wspawnlpe
+  _wspawnv
+  _wspawnve
+  _wspawnvp
+  _wspawnvpe
+  _wsplitpath
+  _wsplitpath_s
+  _wstat32
+  _wstat32i64
+  _wstat64
+  _wstat64i32
+  _wstrdate
+  _wstrdate_s
+  _wstrtime
+  _wstrtime_s
+  _wsystem
+  _wtempnam
+  _wtmpnam
+  _wtmpnam_s
+  _wtof
+  _wtof_l
+  _wtoi
+  _wtoi64
+  _wtoi64_l
+  _wtoi_l
+  _wtol
+  _wtol_l
+  _wunlink
+  _wutime32
+  _wutime64
+  _y0
+  _y1
+  _yn
+  abort
+  abs
+  acos
+  asctime
+  asctime_s
+  asin
+  atan
+  atan2
+  atexit
+  atof
+  atoi
+  atol
+  bsearch
+  bsearch_s
+  btowc
+  calloc
+  ceil
+  clearerr
+  clearerr_s
+  clock
+  cos
+  cosh
+  div
+  exit
+  exp
+  fabs
+  fclose
+  feof
+  ferror
+  fflush
+  fgetc
+  fgetpos
+  fgets
+  fgetwc
+  fgetws
+  floor
+  fmod
+  fopen
+  fopen_s
+  fprintf
+  fprintf_s
+  fputc
+  fputs
+  fputwc
+  fputws
+  fread
+  fread_s
+  free
+  freopen
+  freopen_s
+  frexp
+  fscanf
+  fscanf_s
+  fseek
+  fsetpos
+  ftell
+  fwprintf
+  fwprintf_s
+  fwrite
+  fwscanf
+  fwscanf_s
+  getc
+  getchar
+  getenv
+  getenv_s
+  gets
+  gets_s
+  getwc
+  getwchar
+  is_wctype
+  isalnum
+  isalpha
+  iscntrl
+  isdigit
+  isgraph
+  isleadbyte
+  islower
+  isprint
+  ispunct
+  isspace
+  isupper
+  iswalnum
+  iswalpha
+  iswascii
+  iswcntrl
+  iswctype
+  iswdigit
+  iswgraph
+  iswlower
+  iswprint
+  iswpunct
+  iswspace
+  iswupper
+  iswxdigit
+  isxdigit
+  labs
+  ldexp
+  ldiv
+  llabs
+  lldiv
+  localeconv
+  log
+  log10
+  longjmp
+  malloc
+  mblen
+  mbrlen
+  mbrtowc
+  mbsrtowcs
+  mbsrtowcs_s
+  mbstowcs
+  mbstowcs_s
+  mbtowc
+  memchr
+  memcmp
+  memcpy
+  memcpy_s
+  memmove
+  memmove_s
+  memset
+  modf
+  perror
+  pow
+  printf
+  printf_s
+  putc
+  putchar
+  puts
+  putwc
+  putwchar
+  qsort
+  qsort_s
+  raise
+  rand
+  rand_s
+  realloc
+  remove
+  rename
+  rewind
+  scanf
+  scanf_s
+  setbuf
+  setlocale
+  setvbuf
+  signal
+  sin
+  sinh
+  sprintf
+  sprintf_s
+  sqrt
+  srand
+  sscanf
+  sscanf_s
+  strcat
+  strcat_s
+  strchr
+  strcmp
+  strcoll
+  strcpy
+  strcpy_s
+  strcspn
+  strerror
+  strerror_s
+  strftime
+  strlen
+  strncat
+  strncat_s
+  strncmp
+  strncpy
+  strncpy_s
+  strnlen
+  strpbrk
+  strrchr
+  strspn
+  strstr
+  strtod
+  strtok
+  strtok_s
+  strtol
+  strtoul
+  strxfrm
+  swprintf_s
+  swscanf
+  swscanf_s
+  system
+  tan
+  tanh
+  tmpfile
+  tmpfile_s
+  tmpnam
+  tmpnam_s
+  tolower
+  toupper
+  towlower
+  towupper
+  ungetc
+  ungetwc
+  vfprintf
+  vfprintf_s
+  vfwprintf
+  vfwprintf_s
+  vprintf
+  vprintf_s
+  vsprintf
+  vsprintf_s
+  vswprintf_s
+  vwprintf
+  vwprintf_s
+  wcrtomb
+  wcrtomb_s
+  wcscat
+  wcscat_s
+  wcschr
+  wcscmp
+  wcscoll
+  wcscpy
+  wcscpy_s
+  wcscspn
+  wcsftime
+  wcslen
+  wcsncat
+  wcsncat_s
+  wcsncmp
+  wcsncpy
+  wcsncpy_s
+  wcsnlen
+  wcspbrk
+  wcsrchr
+  wcsrtombs
+  wcsrtombs_s
+  wcsspn
+  wcsstr
+  wcstod
+  wcstok
+  wcstok_s
+  wcstol
+  wcstombs
+  wcstombs_s
+  wcstoul
+  wcsxfrm
+  wctob
+  wctomb
+  wctomb_s
+  wmemcpy_s
+  wmemmove_s
+  wprintf
+  wprintf_s
+  wscanf
+  wscanf_s
+
diff --git a/src/VBox/Runtime/r3/win/VBoxRT-openssl-1.1plus.def b/src/VBox/Runtime/r3/win/VBoxRT-openssl-1.1plus.def
new file mode 100644
index 00000000..5ac7c9a7
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/VBoxRT-openssl-1.1plus.def
@@ -0,0 +1,215 @@
+; $Id: VBoxRT-openssl-1.1plus.def $
+;; @file
+; IPRT - Windows OpenSSL exports we use outside VBoxRT (keep them few!).
+;
+; This file is appended to the architecture specific .def file.
+;
+
+;
+; Copyright (C) 2009-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+    ; ConsoleImpl.cpp uses this when VBOX_OPENSSL_FIPS is enabled.
+    FIPS_mode
+
+    ; VBoxVRDP.dll - secure.cpp
+    BIO_free
+    BIO_new_file
+    BN_bin2bn
+    BN_bn2bin
+    BN_CTX_free
+    BN_CTX_new
+    BN_free
+    BN_mod_exp
+    BN_new
+    BN_num_bits
+    BN_set_word
+    EVP_PKEY_get0_RSA
+    i2d_X509
+    MD5_Final
+    MD5_Init
+    MD5_Update
+    OBJ_obj2nid
+    PEM_read_bio_PrivateKey
+    PEM_read_bio_X509
+    RAND_bytes
+    RC4
+    RC4_set_key
+    RSA_free
+    RSA_generate_key_ex
+    RSA_get0_key
+    RSA_new
+    SHA1_Final
+    SHA1_Init
+    SHA1_Update
+    X509_free
+    X509_get_X509_PUBKEY
+    X509_PUBKEY_get0_param
+
+    ; VBoxVRDP.dll - tcp_vrdp.cpp
+    BIO_new_socket
+    BIO_test_flags
+    OPENSSL_init_ssl
+    SSL_accept
+    SSL_CTX_free
+    SSL_CTX_load_verify_locations
+    SSL_CTX_new
+    SSL_CTX_set_verify
+    SSL_CTX_use_certificate_file
+    SSL_CTX_use_PrivateKey_file
+    SSL_free
+    SSL_get_certificate
+    SSL_new
+    SSL_pending
+    SSL_read
+    SSL_set_bio
+    SSL_set_read_ahead
+    SSL_write
+    TLSv1_server_method
+    X509_get_issuer_name
+    X509_NAME_oneline
+
+    ; VDPluginCrypt.dll (if it wanted to use IPRT) - VDKeyStore.cpp:
+    EVP_aes_128_xts
+    EVP_aes_256_xts
+    EVP_CIPHER_CTX_free
+    EVP_CIPHER_CTX_new
+    EVP_DecryptFinal
+    EVP_DecryptInit
+    EVP_DecryptUpdate
+    EVP_EncryptFinal
+    EVP_EncryptInit
+    EVP_EncryptUpdate
+    EVP_MD_size
+    EVP_sha1
+    EVP_sha256
+    EVP_sha512
+    PKCS5_PBKDF2_HMAC
+    ;exported above: RAND_bytes
+
+    ; VDPluginCrypt.dll (if it wanted to use IPRT) - VDFilterCrypt.cpp:
+    ;exported above: EVP_aes_128_xts
+    ;exported above: EVP_aes_256_xts
+    ;exported above: EVP_CIPHER_CTX_free
+    ;exported above: EVP_CIPHER_CTX_new
+    ;exported above: EVP_DecryptFinal
+    ;exported above: EVP_DecryptInit
+    ;exported above: EVP_DecryptUpdate
+    ;exported above: EVP_EncryptFinal
+    ;exported above: EVP_EncryptInit
+    ;exported above: EVP_EncryptUpdate
+    ;exported above: RAND_bytes
+
+    ; vboxwebsrv needs SSL support.
+    ASN1_STRING_data
+    ASN1_STRING_to_UTF8
+    ;exported above: BIO_free
+    ;exported above: BIO_new_file
+    ;exported above: BIO_new_socket
+    BIO_read
+    BIO_write
+    CRYPTO_free
+    DH_check
+    DH_free
+    DH_generate_parameters
+    ERR_clear_error
+    ERR_error_string
+    ERR_error_string_n
+    ERR_get_error
+    ERR_peek_error
+    GENERAL_NAME_free
+    i2v_GENERAL_NAMES
+    OPENSSL_init_crypto
+    ;exported above: OPENSSL_init_ssl
+    OPENSSL_sk_num
+    OPENSSL_sk_pop_free
+    OPENSSL_sk_value
+    PEM_read_bio_DHparams
+    RAND_load_file
+    RAND_pseudo_bytes
+    RAND_seed
+    RAND_status
+    ;exported above: RSA_free
+    RSA_generate_key
+    ;exported above: SSL_accept
+    SSL_clear
+    SSL_connect
+    SSL_ctrl
+    SSL_CTX_ctrl
+    ;exported above: SSL_CTX_free
+    SSL_CTX_get_cert_store
+    ;exported above: SSL_CTX_load_verify_locations
+    ;exported above: SSL_CTX_new
+    SSL_CTX_set_client_CA_list
+    SSL_CTX_set_default_passwd_cb
+    SSL_CTX_set_default_passwd_cb_userdata
+    SSL_CTX_set_default_verify_paths
+    SSL_CTX_set_options
+    SSL_CTX_set_session_id_context
+    ;exported above: SSL_CTX_set_verify
+    SSL_CTX_set_verify_depth
+    SSL_CTX_use_certificate_chain_file
+    ;exported above: SSL_CTX_use_PrivateKey_file
+    ;exported above: SSL_free
+    SSL_get_error
+    SSL_get_peer_certificate
+    SSL_get_verify_result
+    SSL_get1_session
+    SSL_is_init_finished
+    SSL_load_client_CA_file
+    ;exported above: SSL_new
+    SSL_peek
+    ;exported above: SSL_read
+    SSL_SESSION_free
+    ;exported above: SSL_set_bio
+    SSL_set_session
+    SSL_shutdown
+    SSL_want
+    ;exported above: SSL_write
+    TLS_method
+    ;exported above: X509_free
+    X509_get_ext_d2i
+    ;exported above: X509_get_issuer_name
+    X509_get_subject_name
+    X509_load_crl_file
+    X509_LOOKUP_file
+    X509_NAME_ENTRY_get_data
+    X509_NAME_get_entry
+    X509_NAME_get_index_by_NID
+    ;exported above: X509_NAME_oneline
+    X509_STORE_add_lookup
+    X509_STORE_CTX_get_current_cert
+    X509_STORE_CTX_get_error
+    X509_STORE_CTX_get_error_depth
+    X509_STORE_CTX_set_error
+    X509_STORE_set1_param
+    X509_STORE_set_flags
+    X509_verify_cert_error_string
+    X509_VERIFY_PARAM_free
+    X509_VERIFY_PARAM_new
+    X509_VERIFY_PARAM_set_flags
+    X509V3_conf_free
+
+    ; tstRTBigNum.cpp
+    BN_div
+    BN_mul
+    BN_mod_exp_simple
+    BN_ucmp
+
diff --git a/src/VBox/Runtime/r3/win/VBoxRT-openssl-pre-1.1.def b/src/VBox/Runtime/r3/win/VBoxRT-openssl-pre-1.1.def
new file mode 100644
index 00000000..63bfb727
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/VBoxRT-openssl-pre-1.1.def
@@ -0,0 +1,243 @@
+; $Id: VBoxRT-openssl-pre-1.1.def $
+;; @file
+; IPRT - Windows OpenSSL v1.0.x exports we use outside VBoxRT (keep them few!).
+;
+; This file is appended to the architecture specific .def file.
+;
+
+;
+; Copyright (C) 2009-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+    ; ConsoleImpl.cpp uses this when VBOX_OPENSSL_FIPS is enabled.
+    FIPS_mode
+
+    ; VBoxVRDP.dll - secure.cpp
+    BIO_free
+    BIO_new_file
+    BN_bin2bn
+    BN_bn2bin
+    BN_CTX_free
+    BN_CTX_new
+    BN_free
+    BN_mod_exp
+    BN_new
+    BN_num_bits
+    BN_set_word
+    ;1.1.0: EVP_PKEY_get0_RSA
+    i2d_X509
+    MD5_Final
+    MD5_Init
+    MD5_Update
+    OBJ_obj2nid
+    PEM_read_bio_PrivateKey
+    PEM_read_bio_X509
+    RAND_bytes
+    RC4
+    RC4_set_key
+    RSA_free
+    RSA_generate_key_ex
+    ;1.1.0: RSA_get0_key
+    RSA_new
+    SHA1_Final
+    SHA1_Init
+    SHA1_Update
+    X509_free
+    ;1.1.0: X509_get_X509_PUBKEY
+    X509_PUBKEY_get0_param
+
+    ; VBoxVRDP.dll - secure.cpp - 1.0.1 additions:
+    BN_init
+
+    ; VBoxVRDP.dll - tcp_vrdp.cpp
+    BIO_new_socket
+    BIO_test_flags
+    ;1.1.0: OPENSSL_init_ssl
+    SSL_accept
+    SSL_CTX_free
+    SSL_CTX_load_verify_locations
+    SSL_CTX_new
+    SSL_CTX_set_verify
+    SSL_CTX_use_certificate_file
+    SSL_CTX_use_PrivateKey_file
+    SSL_free
+    SSL_get_certificate
+    SSL_new
+    SSL_pending
+    SSL_read
+    SSL_set_bio
+    SSL_set_read_ahead
+    SSL_write
+    TLSv1_server_method
+    X509_get_issuer_name
+    X509_NAME_oneline
+
+    ; VDPluginCrypt.dll (if it wanted to use IPRT) - VDKeyStore.cpp:
+    EVP_aes_128_xts
+    EVP_aes_256_xts
+    EVP_CIPHER_CTX_free
+    EVP_CIPHER_CTX_new
+    EVP_DecryptFinal
+    EVP_DecryptInit
+    EVP_DecryptUpdate
+    EVP_EncryptFinal
+    EVP_EncryptInit
+    EVP_EncryptUpdate
+    EVP_MD_size
+    EVP_sha1
+    EVP_sha256
+    EVP_sha512
+    PKCS5_PBKDF2_HMAC
+    ;exported above: RAND_bytes
+
+    ; VDPluginCrypt.dll (if it wanted to use IPRT) - VDFilterCrypt.cpp:
+    ;exported above: EVP_aes_128_xts
+    ;exported above: EVP_aes_256_xts
+    ;exported above: EVP_CIPHER_CTX_free
+    ;exported above: EVP_CIPHER_CTX_new
+    ;exported above: EVP_DecryptFinal
+    ;exported above: EVP_DecryptInit
+    ;exported above: EVP_DecryptUpdate
+    ;exported above: EVP_EncryptFinal
+    ;exported above: EVP_EncryptInit
+    ;exported above: EVP_EncryptUpdate
+    ;exported above: RAND_bytes
+
+    ; vboxwebsrv needs SSL support.
+    ASN1_STRING_data
+    ASN1_STRING_to_UTF8
+    ;exported above: BIO_free
+    ;exported above: BIO_new_file
+    ;exported above: BIO_new_socket
+    BIO_read
+    BIO_write
+    CRYPTO_free
+    DH_check
+    DH_free
+    DH_generate_parameters
+    ERR_clear_error
+    ERR_error_string
+    ERR_error_string_n
+    ERR_get_error
+    ERR_peek_error
+    GENERAL_NAME_free
+    i2v_GENERAL_NAMES
+    ;1.1.0: OPENSSL_init_crypto
+    ;exported above: OPENSSL_init_ssl
+    ;1.1.0: OPENSSL_sk_num
+    ;1.1.0: OPENSSL_sk_pop_free
+    ;1.1.0: OPENSSL_sk_value
+    PEM_read_bio_DHparams
+    RAND_load_file
+    RAND_pseudo_bytes
+    RAND_seed
+    RAND_status
+    ;exported above: RSA_free
+    RSA_generate_key
+    ;exported above: SSL_accept
+    SSL_clear
+    SSL_connect
+    SSL_ctrl
+    SSL_CTX_ctrl
+    ;exported above: SSL_CTX_free
+    SSL_CTX_get_cert_store
+    ;exported above: SSL_CTX_load_verify_locations
+    ;exported above: SSL_CTX_new
+    SSL_CTX_set_client_CA_list
+    SSL_CTX_set_default_passwd_cb
+    SSL_CTX_set_default_passwd_cb_userdata
+    SSL_CTX_set_default_verify_paths
+    ;1.1.0: SSL_CTX_set_options
+    SSL_CTX_set_session_id_context
+    ;exported above: SSL_CTX_set_verify
+    SSL_CTX_set_verify_depth
+    SSL_CTX_use_certificate_chain_file
+    ;exported above: SSL_CTX_use_PrivateKey_file
+    ;exported above: SSL_free
+    SSL_get_error
+    SSL_get_peer_certificate
+    SSL_get_verify_result
+    SSL_get1_session
+    ;1.1.0: SSL_is_init_finished
+    SSL_load_client_CA_file
+    ;exported above: SSL_new
+    SSL_peek
+    ;exported above: SSL_read
+    SSL_SESSION_free
+    ;exported above: SSL_set_bio
+    SSL_set_session
+    SSL_shutdown
+    SSL_want
+    ;exported above: SSL_write
+    ;1.1.0: TLS_method
+    ;exported above: X509_free
+    X509_get_ext_d2i
+    ;exported above: X509_get_issuer_name
+    X509_get_subject_name
+    X509_load_crl_file
+    X509_LOOKUP_file
+    X509_NAME_ENTRY_get_data
+    X509_NAME_get_entry
+    X509_NAME_get_index_by_NID
+    ;exported above: X509_NAME_oneline
+    X509_STORE_add_lookup
+    X509_STORE_CTX_get_current_cert
+    X509_STORE_CTX_get_error
+    X509_STORE_CTX_get_error_depth
+    X509_STORE_CTX_set_error
+    X509_STORE_set1_param
+    X509_STORE_set_flags
+    X509_verify_cert_error_string
+    X509_VERIFY_PARAM_free
+    X509_VERIFY_PARAM_new
+    X509_VERIFY_PARAM_set_flags
+    X509V3_conf_free
+
+    ; vboxwebsrv - 1.0.1 additions
+    CRYPTO_set_dynlock_destroy_callback
+    CRYPTO_set_dynlock_lock_callback
+    CRYPTO_set_dynlock_create_callback
+    CRYPTO_set_locking_callback
+    CRYPTO_set_id_callback
+    CRYPTO_num_locks
+    ERR_remove_state
+    OPENSSL_add_all_algorithms_noconf
+    sk_value
+    sk_num
+    sk_pop_free
+    SSL_load_error_strings
+    SSL_library_init
+    SSL_state
+    SSLv23_method
+
+    ; vboxwebsrv - 1.0.1 additions for older gsoap version.
+    ASN1_item_d2i
+    OBJ_nid2sn
+    X509_EXTENSION_get_object
+    X509_get_ext
+    X509_get_ext_count
+    X509V3_EXT_get
+
+    ; tstRTBigNum.cpp
+    BN_div
+    BN_mul
+    BN_mod_exp_simple
+    BN_ucmp
+
diff --git a/src/VBox/Runtime/r3/win/VBoxRT-win32.def b/src/VBox/Runtime/r3/win/VBoxRT-win32.def
new file mode 100644
index 00000000..88d2b9fc
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/VBoxRT-win32.def
@@ -0,0 +1,46 @@
+; $Id: VBoxRT-win32.def $
+;; @file
+; IPRT - Win32 ASM exports.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+EXPORTS
+    ASMMultU64ByU32DivByU32
+
+    RTTimeNanoTSLegacySyncInvarNoDelta
+    RTTimeNanoTSLFenceSyncInvarNoDelta
+    RTTimeNanoTSLegacyAsyncUseApicId
+    RTTimeNanoTSLegacyAsyncUseRdtscp
+    RTTimeNanoTSLegacyAsyncUseIdtrLim
+    RTTimeNanoTSLegacySyncInvarWithDeltaUseApicId
+    RTTimeNanoTSLegacySyncInvarWithDeltaUseRdtscp
+    RTTimeNanoTSLegacySyncInvarWithDeltaUseIdtrLim
+    RTTimeNanoTSLFenceAsyncUseApicId
+    RTTimeNanoTSLFenceAsyncUseRdtscp
+    RTTimeNanoTSLFenceAsyncUseIdtrLim
+    RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicId
+    RTTimeNanoTSLFenceSyncInvarWithDeltaUseRdtscp
+    RTTimeNanoTSLFenceSyncInvarWithDeltaUseIdtrLim
+
+    RTStrMemFind32
+
diff --git a/src/VBox/Runtime/r3/win/VBoxRT-win64.def b/src/VBox/Runtime/r3/win/VBoxRT-win64.def
new file mode 100644
index 00000000..909194b2
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/VBoxRT-win64.def
@@ -0,0 +1,58 @@
+; $Id: VBoxRT-win64.def $
+;; @file
+; IPRT - Win64 ASM exports.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+EXPORTS
+    ASMAtomicBitClear
+    ASMAtomicBitToggle
+    ASMAtomicBitTestAndToggle
+    ASMBitFirstClear
+    ASMBitFirstSet
+    ASMAtomicReadU64
+    ASMAtomicXchgU8
+    ASMAtomicXchgU16
+    ASMGetFlags
+    ASMProbeReadByte
+    ASMSetFlags
+    ASMMultU64ByU32DivByU32
+    ASMNopPause
+
+    RTTimeNanoTSLegacySyncInvarNoDelta
+    RTTimeNanoTSLFenceSyncInvarNoDelta
+    RTTimeNanoTSLegacyAsyncUseApicId
+    RTTimeNanoTSLegacyAsyncUseRdtscp
+    RTTimeNanoTSLegacyAsyncUseIdtrLim
+    RTTimeNanoTSLegacySyncInvarWithDeltaUseApicId
+    RTTimeNanoTSLegacySyncInvarWithDeltaUseRdtscp
+    RTTimeNanoTSLegacySyncInvarWithDeltaUseIdtrLim
+    RTTimeNanoTSLFenceAsyncUseApicId
+    RTTimeNanoTSLFenceAsyncUseRdtscp
+    RTTimeNanoTSLFenceAsyncUseIdtrLim
+    RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicId
+    RTTimeNanoTSLFenceSyncInvarWithDeltaUseRdtscp
+    RTTimeNanoTSLFenceSyncInvarWithDeltaUseIdtrLim
+
+    RTStrMemFind32
+
diff --git a/src/VBox/Runtime/r3/win/alloc-win.cpp b/src/VBox/Runtime/r3/win/alloc-win.cpp
new file mode 100644
index 00000000..d9ba98c9
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/alloc-win.cpp
@@ -0,0 +1,236 @@
+/* $Id: alloc-win.cpp $ */
+/** @file
+ * IPRT - Memory Allocation, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+/*#define USE_VIRTUAL_ALLOC*/
+#define LOG_GROUP RTLOGGROUP_MEM
+#include <iprt/win/windows.h>
+
+#include <iprt/alloc.h>
+#include <iprt/assert.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/errcore.h>
+
+#ifndef USE_VIRTUAL_ALLOC
+# include <malloc.h>
+#endif
+
+
+RTDECL(void *) RTMemExecAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
+{
+    RT_NOREF_PV(pszTag);
+
+    /*
+     * Allocate first.
+     */
+    AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
+    cb = RT_ALIGN_Z(cb, 32);
+    void *pv = malloc(cb);
+    AssertMsg(pv, ("malloc(%d) failed!!!\n", cb));
+    if (pv)
+    {
+        memset(pv, 0xcc, cb);
+        void   *pvProt = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
+        size_t  cbProt = ((uintptr_t)pv & PAGE_OFFSET_MASK) + cb;
+        cbProt = RT_ALIGN_Z(cbProt, PAGE_SIZE);
+        DWORD fFlags = 0;
+        if (!VirtualProtect(pvProt, cbProt, PAGE_EXECUTE_READWRITE, &fFlags))
+        {
+            AssertMsgFailed(("VirtualProtect(%p, %#x,,) -> lasterr=%d\n", pvProt, cbProt, GetLastError()));
+            free(pv);
+            pv = NULL;
+        }
+    }
+    return pv;
+}
+
+
+RTDECL(void)    RTMemExecFree(void *pv, size_t cb) RT_NO_THROW_DEF
+{
+    RT_NOREF_PV(cb);
+
+    if (pv)
+        free(pv);
+}
+
+
+RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
+{
+    RT_NOREF_PV(pszTag);
+
+#ifdef USE_VIRTUAL_ALLOC
+    void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
+#else
+    void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE);
+#endif
+    AssertMsg(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()));
+    return pv;
+}
+
+
+RTDECL(void *) RTMemPageAllocExTag(size_t cb, uint32_t fFlags, const char *pszTag) RT_NO_THROW_DEF
+{
+    size_t const cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
+    RT_NOREF_PV(pszTag);
+    AssertReturn(!(fFlags & ~RTMEMPAGEALLOC_F_VALID_MASK), NULL);
+
+#ifdef USE_VIRTUAL_ALLOC
+    void *pv = VirtualAlloc(NULL, cbAligned, MEM_COMMIT, PAGE_READWRITE);
+#else
+    void *pv = _aligned_malloc(cbAligned, PAGE_SIZE);
+#endif
+    AssertMsgReturn(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()), NULL);
+
+    if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
+    {
+        /** @todo check why we get ERROR_WORKING_SET_QUOTA here. */
+        BOOL const fOkay = VirtualLock(pv, cbAligned);
+        AssertMsg(fOkay || GetLastError() == ERROR_WORKING_SET_QUOTA, ("pv=%p cb=%d lasterr=%d\n", pv, cb, GetLastError()));
+        NOREF(fOkay);
+    }
+
+    if (fFlags & RTMEMPAGEALLOC_F_ZERO)
+        RT_BZERO(pv, cbAligned);
+
+    return pv;
+}
+
+
+RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
+{
+    RT_NOREF_PV(pszTag);
+
+#ifdef USE_VIRTUAL_ALLOC
+    void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
+#else
+    void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE);
+#endif
+    if (pv)
+    {
+        memset(pv, 0, RT_ALIGN_Z(cb, PAGE_SIZE));
+        return pv;
+    }
+    AssertMsgFailed(("cb=%d lasterr=%d\n", cb, GetLastError()));
+    return NULL;
+}
+
+
+RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF
+{
+    RT_NOREF_PV(cb);
+
+    if (pv)
+    {
+#ifdef USE_VIRTUAL_ALLOC
+        if (!VirtualFree(pv, 0, MEM_RELEASE))
+            AssertMsgFailed(("pv=%p lasterr=%d\n", pv, GetLastError()));
+#else
+        _aligned_free(pv);
+#endif
+    }
+}
+
+
+RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW_DEF
+{
+    /*
+     * Validate input.
+     */
+    if (cb == 0)
+    {
+        AssertMsgFailed(("!cb\n"));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
+    {
+        AssertMsgFailed(("fProtect=%#x\n", fProtect));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Convert the flags.
+     */
+    int fProt;
+    Assert(!RTMEM_PROT_NONE);
+    switch (fProtect & (RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
+    {
+        case RTMEM_PROT_NONE:
+            fProt = PAGE_NOACCESS;
+            break;
+
+        case RTMEM_PROT_READ:
+            fProt = PAGE_READONLY;
+            break;
+
+        case RTMEM_PROT_READ | RTMEM_PROT_WRITE:
+            fProt = PAGE_READWRITE;
+            break;
+
+        case RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
+            fProt = PAGE_EXECUTE_READWRITE;
+            break;
+
+        case RTMEM_PROT_READ | RTMEM_PROT_EXEC:
+            fProt = PAGE_EXECUTE_READWRITE;
+            break;
+
+        case RTMEM_PROT_WRITE:
+            fProt = PAGE_READWRITE;
+            break;
+
+        case RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
+            fProt = PAGE_EXECUTE_READWRITE;
+            break;
+
+        case RTMEM_PROT_EXEC:
+            fProt = PAGE_EXECUTE_READWRITE;
+            break;
+
+        /* If the compiler had any brains it would warn about this case. */
+        default:
+            AssertMsgFailed(("fProtect=%#x\n", fProtect));
+            return VERR_INTERNAL_ERROR;
+    }
+
+    /*
+     * Align the request.
+     */
+    cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
+    pv = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
+
+    /*
+     * Change the page attributes.
+     */
+    DWORD fFlags = 0;
+    if (VirtualProtect(pv, cb, fProt, &fFlags))
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
diff --git a/src/VBox/Runtime/r3/win/allocex-win.cpp b/src/VBox/Runtime/r3/win/allocex-win.cpp
new file mode 100644
index 00000000..16599707
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/allocex-win.cpp
@@ -0,0 +1,123 @@
+/* $Id: allocex-win.cpp $ */
+/** @file
+ * IPRT - Memory Allocation, Extended Alloc Workers, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RTMEM_NO_WRAP_TO_EF_APIS
+#include <iprt/mem.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include <iprt/param.h>
+#include "../allocex.h"
+
+#include <iprt/win/windows.h>
+
+
+static int rtMemAllocExInRange(size_t cbAlloc, uint32_t fFlags, void **ppv, uintptr_t uAddr, uintptr_t uAddrLast)
+{
+    /*
+     * Try with every possible address hint since the possible range is very limited.
+     */
+    DWORD     fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
+    while (uAddr <= uAddrLast)
+    {
+        MEMORY_BASIC_INFORMATION MemInfo;
+        SIZE_T cbRange = VirtualQuery((void *)uAddr, &MemInfo, sizeof(MemInfo));
+        AssertReturn(cbRange == sizeof(MemInfo), VERR_NOT_SUPPORTED);
+        Assert(MemInfo.RegionSize > 0);
+
+        if (   MemInfo.State == MEM_FREE
+            && MemInfo.RegionSize >= cbAlloc)
+        {
+            void *pv = VirtualAlloc((void *)uAddr, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
+            if ((uintptr_t)pv == uAddr)
+            {
+                *ppv = pv;
+                return VINF_SUCCESS;
+            }
+            AssertStmt(!pv, VirtualFree(pv, cbAlloc, MEM_RELEASE));
+        }
+
+        /* skip ahead */
+        uintptr_t uAddrNext = (uintptr_t)MemInfo.BaseAddress + MemInfo.RegionSize;
+        if (uAddrNext <= uAddr)
+            break;
+        uAddr += uAddrNext;
+    }
+
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtMemAllocEx16BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
+{
+    cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
+    AssertReturn(cbAlloc <= _64K - PAGE_SIZE, VERR_NO_MEMORY);
+
+    /* Seems this doesn't work on W7/64... */
+    return rtMemAllocExInRange(cbAlloc, fFlags, ppv, PAGE_SIZE, _64K - cbAlloc);
+}
+
+
+DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
+{
+    cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
+    AssertReturn(cbAlloc <= _2G+_1G, VERR_NO_MEMORY);
+
+    /*
+     * Just try first.
+     */
+    DWORD     fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
+    void *pv = VirtualAlloc(NULL, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
+    if (!pv)
+        return VERR_NO_MEMORY;
+    if ((uintptr_t)pv + cbAlloc - 1 < _4G)
+    {
+        *ppv = pv;
+        return VINF_SUCCESS;
+    }
+    VirtualFree(pv, cbAlloc, MEM_RELEASE);
+
+    /*
+     * No luck, do address scan based allocation.
+     */
+    return rtMemAllocExInRange(cbAlloc, fFlags, ppv, _64K, _4G - cbAlloc);
+}
+
+
+DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags)
+{
+    RT_NOREF_PV(fFlags);
+
+    BOOL fRc = VirtualFree(pv, cb, MEM_RELEASE);
+    Assert(fRc); RT_NOREF_PV(fRc);
+}
+
diff --git a/src/VBox/Runtime/r3/win/dir-win.cpp b/src/VBox/Runtime/r3/win/dir-win.cpp
new file mode 100644
index 00000000..dc6e64e3
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/dir-win.cpp
@@ -0,0 +1,159 @@
+/* $Id: dir-win.cpp $ */
+/** @file
+ * IPRT - Directory, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_DIR
+#include <iprt/win/windows.h>
+
+#include <iprt/dir.h>
+#include <iprt/path.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/log.h>
+#include "internal/fs.h"
+#include "internal/path.h"
+
+
+
+RTDECL(int) RTDirCreate(const char *pszPath, RTFMODE fMode, uint32_t fCreate)
+{
+    /*
+     * Validate the file mode.
+     */
+    int rc;
+    fMode = rtFsModeNormalize(fMode, pszPath, 0, RTFS_TYPE_DIRECTORY);
+    if (rtFsModeIsValidPermissions(fMode))
+    {
+        /*
+         * Convert to UTF-16.
+         */
+        PRTUTF16 pwszString;
+        rc = RTPathWinFromUtf8(&pwszString, pszPath, 0 /*fFlags*/);
+        AssertRC(rc);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Create the directory.
+             */
+            if (CreateDirectoryW((LPCWSTR)pwszString, NULL))
+                rc = VINF_SUCCESS;
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+
+            /*
+             * Turn off indexing of directory through Windows Indexing Service
+             */
+            /** @todo This FILE_ATTRIBUTE_NOT_CONTENT_INDEXED hack (for .VDI files,
+             *        really) may cause failures on samba shares.  That really sweet and
+             *        need to be addressed differently.  We shouldn't be doing this
+             *        unless the caller actually asks for it, must less returning failure,
+             *        for crying out loud!  This is only important a couple of places in
+             *        main, if important is the right way to put it... */
+            if (   RT_SUCCESS(rc)
+                && !(fCreate & RTDIRCREATE_FLAGS_NOT_CONTENT_INDEXED_DONT_SET))
+            {
+                if (   SetFileAttributesW((LPCWSTR)pwszString, FILE_ATTRIBUTE_NOT_CONTENT_INDEXED)
+                    || (fCreate & RTDIRCREATE_FLAGS_NOT_CONTENT_INDEXED_NOT_CRITICAL) )
+                    rc = VINF_SUCCESS;
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+
+            RTPathWinFree(pwszString);
+        }
+    }
+    else
+    {
+        AssertMsgFailed(("Invalid file mode! %RTfmode\n", fMode));
+        rc = VERR_INVALID_FMODE;
+    }
+
+    LogFlow(("RTDirCreate(%p:{%s}, %RTfmode): returns %Rrc\n", pszPath, pszPath, fMode, rc));
+    return rc;
+}
+
+
+RTDECL(int) RTDirRemove(const char *pszPath)
+{
+    /*
+     * Convert to UTF-16.
+     */
+    PRTUTF16 pwszString;
+    int rc = RTPathWinFromUtf8(&pwszString, pszPath, 0 /*fFlags*/);
+    AssertRC(rc);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Remove the directory.
+         */
+        if (RemoveDirectoryW((LPCWSTR)pwszString))
+            rc = VINF_SUCCESS;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+
+        RTPathWinFree(pwszString);
+    }
+
+    LogFlow(("RTDirRemove(%p:{%s}): returns %Rrc\n", pszPath, pszPath, rc));
+    return rc;
+}
+
+
+RTDECL(int) RTDirFlush(const char *pszPath)
+{
+    RT_NOREF_PV(pszPath);
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(int) RTDirRename(const char *pszSrc, const char *pszDst, unsigned fRename)
+{
+    /*
+     * Validate input.
+     */
+    AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
+    AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
+    AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
+
+    /*
+     * Call the worker.
+     */
+    int rc = rtPathWin32MoveRename(pszSrc, pszDst,
+                                   fRename & RTPATHRENAME_FLAGS_REPLACE ? MOVEFILE_REPLACE_EXISTING : 0,
+                                   RTFS_TYPE_DIRECTORY);
+
+    LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n", pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/direnum-win.cpp b/src/VBox/Runtime/r3/win/direnum-win.cpp
new file mode 100644
index 00000000..0518d45b
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/direnum-win.cpp
@@ -0,0 +1,394 @@
+/* $Id: direnum-win.cpp $ */
+/** @file
+ * IPRT - Directory Enumeration, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_DIR
+#include <iprt/win/windows.h>
+
+#include <iprt/dir.h>
+#include <iprt/path.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/log.h>
+#include "internal/fs.h"
+#include "internal/dir.h"
+
+
+size_t rtDirNativeGetStructSize(const char *pszPath)
+{
+    NOREF(pszPath);
+    return sizeof(RTDIRINTERNAL);
+}
+
+
+int rtDirNativeOpen(PRTDIRINTERNAL pDir, uintptr_t hRelativeDir, void *pvNativeRelative))
+{
+    RT_NOREF(hRelativeDir, pvNativeRelative);
+
+    /*
+     * Setup the search expression.
+     *
+     * pszPathBuf is pointing to the return 4K return buffer for the RTPathReal()
+     * call in rtDirOpenCommon(), so all we gota do is check that we don't overflow
+     * it when adding the wildcard expression.
+     */
+/** @todo the pszPathBuf argument was removed in order to support paths longer than RTPATH_MAX.  Rewrite this code. */
+    size_t cbExpr;
+    const char *pszExpr;
+    if (pDir->enmFilter == RTDIRFILTER_WINNT)
+    {
+        pszExpr = pDir->pszFilter;
+        cbExpr  = pDir->cchFilter + 1;
+    }
+    else
+    {
+        pszExpr = "*";
+        cbExpr  = sizeof("*");
+    }
+    if (pDir->cchPath + cbExpr > RTPATH_MAX)
+        return VERR_FILENAME_TOO_LONG;
+    memcpy(pszPathBuf + pDir->cchPath, pszExpr, cbExpr);
+
+
+    /*
+     * Attempt opening the search.
+     */
+    PRTUTF16 pwszName;
+    int rc = RTPathWinFromUtf8(pwszPathBuf, &pwszName, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        pDir->hDir = FindFirstFileW((LPCWSTR)pwszName, &pDir->Data);
+        if (pDir->hDir != INVALID_HANDLE_VALUE)
+            pDir->fDataUnread = true;
+        else
+        {
+            DWORD dwErr = GetLastError();
+            /* Theoretical case of an empty directory or more normal case of no matches. */
+            if (   dwErr == ERROR_FILE_NOT_FOUND
+                || dwErr == ERROR_NO_MORE_FILES /* ???*/)
+                pDir->fDataUnread = false;
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+        }
+        RTPathWinFree(pwszName);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTDirClose(PRTDIRINTERNAL pDir)
+{
+    /*
+     * Validate input.
+     */
+    if (!pDir)
+        return VERR_INVALID_PARAMETER;
+    if (pDir->u32Magic != RTDIR_MAGIC)
+    {
+        AssertMsgFailed(("Invalid pDir=%p\n", pDir));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Close the handle.
+     */
+    pDir->u32Magic++;
+    if (pDir->hDir != INVALID_HANDLE_VALUE)
+    {
+        BOOL fRc = FindClose(pDir->hDir);
+        Assert(fRc);
+        pDir->hDir = INVALID_HANDLE_VALUE;
+    }
+    RTStrFree(pDir->pszName);
+    pDir->pszName = NULL;
+    RTMemFree(pDir);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTDirRead(RTDIR hDir, PRTDIRENTRY pDirEntry, size_t *pcbDirEntry)
+{
+    PPRTDIRINTERNAL pDir = hDir;
+
+    /*
+     * Validate input.
+     */
+    if (!pDir || pDir->u32Magic != RTDIR_MAGIC)
+    {
+        AssertMsgFailed(("Invalid pDir=%p\n", pDir));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (!pDirEntry)
+    {
+        AssertMsgFailed(("Invalid pDirEntry=%p\n", pDirEntry));
+        return VERR_INVALID_PARAMETER;
+    }
+    size_t cbDirEntry = sizeof(*pDirEntry);
+    if (pcbDirEntry)
+    {
+        cbDirEntry = *pcbDirEntry;
+        if (cbDirEntry < RT_UOFFSETOF(RTDIRENTRY, szName[2]))
+        {
+            AssertMsgFailed(("Invalid *pcbDirEntry=%zu (min %zu)\n", *pcbDirEntry, RT_UOFFSETOF(RTDIRENTRY, szName[2])));
+            return VERR_INVALID_PARAMETER;
+        }
+    }
+
+    /*
+     * Fetch data?
+     */
+    if (!pDir->fDataUnread)
+    {
+        RTStrFree(pDir->pszName);
+        pDir->pszName = NULL;
+
+        BOOL fRc = FindNextFileW(pDir->hDir, &pDir->Data);
+        if (!fRc)
+        {
+            int iErr = GetLastError();
+            if (pDir->hDir == INVALID_HANDLE_VALUE || iErr == ERROR_NO_MORE_FILES)
+                return VERR_NO_MORE_FILES;
+            return RTErrConvertFromWin32(iErr);
+        }
+    }
+
+    /*
+     * Convert the filename to UTF-8.
+     */
+    if (!pDir->pszName)
+    {
+        int rc = RTUtf16ToUtf8((PCRTUTF16)pDir->Data.cFileName, &pDir->pszName);
+        if (RT_FAILURE(rc))
+        {
+            pDir->pszName = NULL;
+            return rc;
+        }
+        pDir->cchName = strlen(pDir->pszName);
+    }
+
+    /*
+     * Check if we've got enough space to return the data.
+     */
+    const char  *pszName    = pDir->pszName;
+    const size_t cchName    = pDir->cchName;
+    const size_t cbRequired = RT_UOFFSETOF(RTDIRENTRY, szName[1]) + cchName;
+    if (pcbDirEntry)
+        *pcbDirEntry = cbRequired;
+    if (cbRequired > cbDirEntry)
+        return VERR_BUFFER_OVERFLOW;
+
+    /*
+     * Setup the returned data.
+     */
+    pDir->fDataUnread  = false;
+    pDirEntry->INodeId = 0; /** @todo we can use the fileid here if we must (see GetFileInformationByHandle). */
+    pDirEntry->enmType = pDir->Data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY
+                       ? RTDIRENTRYTYPE_DIRECTORY : RTDIRENTRYTYPE_FILE;
+    pDirEntry->cbName  = (uint16_t)cchName;
+    Assert(pDirEntry->cbName == cchName);
+    memcpy(pDirEntry->szName, pszName, cchName + 1);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTDirReadEx(RTDIR hDir, PRTDIRENTRYEX pDirEntry, size_t *pcbDirEntry, RTFSOBJATTRADD enmAdditionalAttribs, uint32_t fFlags)
+{
+    PPRTDIRINTERNAL pDir = hDir;
+    /** @todo Symlinks: Find[First|Next]FileW will return info about
+        the link, so RTPATH_F_FOLLOW_LINK is not handled correctly. */
+    /*
+     * Validate input.
+     */
+    if (!pDir || pDir->u32Magic != RTDIR_MAGIC)
+    {
+        AssertMsgFailed(("Invalid pDir=%p\n", pDir));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (!pDirEntry)
+    {
+        AssertMsgFailed(("Invalid pDirEntry=%p\n", pDirEntry));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (    enmAdditionalAttribs < RTFSOBJATTRADD_NOTHING
+        ||  enmAdditionalAttribs > RTFSOBJATTRADD_LAST)
+    {
+        AssertMsgFailed(("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs));
+        return VERR_INVALID_PARAMETER;
+    }
+    AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
+    size_t cbDirEntry = sizeof(*pDirEntry);
+    if (pcbDirEntry)
+    {
+        cbDirEntry = *pcbDirEntry;
+        if (cbDirEntry < RT_UOFFSETOF(RTDIRENTRYEX, szName[2]))
+        {
+            AssertMsgFailed(("Invalid *pcbDirEntry=%zu (min %zu)\n", *pcbDirEntry, RT_UOFFSETOF(RTDIRENTRYEX, szName[2])));
+            return VERR_INVALID_PARAMETER;
+        }
+    }
+
+    /*
+     * Fetch data?
+     */
+    if (!pDir->fDataUnread)
+    {
+        RTStrFree(pDir->pszName);
+        pDir->pszName = NULL;
+
+        BOOL fRc = FindNextFileW(pDir->hDir, &pDir->Data);
+        if (!fRc)
+        {
+            int iErr = GetLastError();
+            if (pDir->hDir == INVALID_HANDLE_VALUE || iErr == ERROR_NO_MORE_FILES)
+                return VERR_NO_MORE_FILES;
+            return RTErrConvertFromWin32(iErr);
+        }
+    }
+
+    /*
+     * Convert the filename to UTF-8.
+     */
+    if (!pDir->pszName)
+    {
+        int rc = RTUtf16ToUtf8((PCRTUTF16)pDir->Data.cFileName, &pDir->pszName);
+        if (RT_FAILURE(rc))
+        {
+            pDir->pszName = NULL;
+            return rc;
+        }
+        pDir->cchName = strlen(pDir->pszName);
+    }
+
+    /*
+     * Check if we've got enough space to return the data.
+     */
+    const char  *pszName    = pDir->pszName;
+    const size_t cchName    = pDir->cchName;
+    const size_t cbRequired = RT_UOFFSETOF(RTDIRENTRYEX, szName[1]) + cchName;
+    if (pcbDirEntry)
+        *pcbDirEntry = cbRequired;
+    if (cbRequired > cbDirEntry)
+        return VERR_BUFFER_OVERFLOW;
+
+    /*
+     * Setup the returned data.
+     */
+    pDir->fDataUnread  = false;
+    pDirEntry->cbName  = (uint16_t)cchName;
+    Assert(pDirEntry->cbName == cchName);
+    memcpy(pDirEntry->szName, pszName, cchName + 1);
+    if (pDir->Data.cAlternateFileName[0])
+    {
+        /* copy and calc length */
+        PCRTUTF16 pwszSrc = (PCRTUTF16)pDir->Data.cAlternateFileName;
+        PRTUTF16  pwszDst = pDirEntry->wszShortName;
+        uint32_t  off = 0;
+        while (off < RT_ELEMENTS(pDirEntry->wszShortName) - 1U && pwszSrc[off])
+        {
+            pwszDst[off] = pwszSrc[off];
+            off++;
+        }
+        pDirEntry->cwcShortName = (uint16_t)off;
+
+        /* zero the rest */
+        do
+            pwszDst[off++] = '\0';
+        while (off < RT_ELEMENTS(pDirEntry->wszShortName));
+    }
+    else
+    {
+        memset(pDirEntry->wszShortName, 0, sizeof(pDirEntry->wszShortName));
+        pDirEntry->cwcShortName = 0;
+    }
+
+    pDirEntry->Info.cbObject    = ((uint64_t)pDir->Data.nFileSizeHigh << 32)
+                                |  (uint64_t)pDir->Data.nFileSizeLow;
+    pDirEntry->Info.cbAllocated = pDirEntry->Info.cbObject;
+
+    Assert(sizeof(uint64_t) == sizeof(pDir->Data.ftCreationTime));
+    RTTimeSpecSetNtTime(&pDirEntry->Info.BirthTime,         *(uint64_t *)&pDir->Data.ftCreationTime);
+    RTTimeSpecSetNtTime(&pDirEntry->Info.AccessTime,        *(uint64_t *)&pDir->Data.ftLastAccessTime);
+    RTTimeSpecSetNtTime(&pDirEntry->Info.ModificationTime,  *(uint64_t *)&pDir->Data.ftLastWriteTime);
+    pDirEntry->Info.ChangeTime  = pDirEntry->Info.ModificationTime;
+
+    pDirEntry->Info.Attr.fMode  = rtFsModeFromDos((pDir->Data.dwFileAttributes << RTFS_DOS_SHIFT) & RTFS_DOS_MASK_NT,
+                                                   pszName, cchName, pDir->Data.dwReserved0, 0);
+
+    /*
+     * Requested attributes (we cannot provide anything actually).
+     */
+    switch (enmAdditionalAttribs)
+    {
+        case RTFSOBJATTRADD_EASIZE:
+            pDirEntry->Info.Attr.enmAdditional          = RTFSOBJATTRADD_EASIZE;
+            pDirEntry->Info.Attr.u.EASize.cb            = 0;
+            break;
+
+        case RTFSOBJATTRADD_UNIX:
+            pDirEntry->Info.Attr.enmAdditional          = RTFSOBJATTRADD_UNIX;
+            pDirEntry->Info.Attr.u.Unix.uid             = ~0U;
+            pDirEntry->Info.Attr.u.Unix.gid             = ~0U;
+            pDirEntry->Info.Attr.u.Unix.cHardlinks      = 1;
+            pDirEntry->Info.Attr.u.Unix.INodeIdDevice   = 0; /** @todo Use the volume serial number (see GetFileInformationByHandle). */
+            pDirEntry->Info.Attr.u.Unix.INodeId         = 0; /** @todo Use the fileid (see GetFileInformationByHandle). */
+            pDirEntry->Info.Attr.u.Unix.fFlags          = 0;
+            pDirEntry->Info.Attr.u.Unix.GenerationId    = 0;
+            pDirEntry->Info.Attr.u.Unix.Device          = 0;
+            break;
+
+        case RTFSOBJATTRADD_NOTHING:
+            pDirEntry->Info.Attr.enmAdditional          = RTFSOBJATTRADD_NOTHING;
+            break;
+
+        case RTFSOBJATTRADD_UNIX_OWNER:
+            pDirEntry->Info.Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_OWNER;
+            pDirEntry->Info.Attr.u.UnixOwner.uid        = ~0U;
+            pDirEntry->Info.Attr.u.UnixOwner.szName[0]  = '\0'; /** @todo return something sensible here. */
+            break;
+
+        case RTFSOBJATTRADD_UNIX_GROUP:
+            pDirEntry->Info.Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_GROUP;
+            pDirEntry->Info.Attr.u.UnixGroup.gid        = ~0U;
+            pDirEntry->Info.Attr.u.UnixGroup.szName[0]  = '\0';
+            break;
+
+        default:
+            AssertMsgFailed(("Impossible!\n"));
+            return VERR_INTERNAL_ERROR;
+    }
+
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/Runtime/r3/win/dllmain-win.cpp b/src/VBox/Runtime/r3/win/dllmain-win.cpp
new file mode 100644
index 00000000..87883b0f
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/dllmain-win.cpp
@@ -0,0 +1,90 @@
+/* $Id: dllmain-win.cpp $ */
+/** @file
+ * IPRT - Win32 DllMain (Ring-3).
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/windows.h>
+#include <iprt/thread.h>
+#include <iprt/param.h>
+#include "internal/thread.h"
+
+
+
+/**
+ * Increases the load count on the IPRT DLL so it won't unload.
+ *
+ * This is a separate function so as to not overflow the stack of threads with
+ * very little of it.
+ *
+ * @param   hModule     The IPRT DLL module handle.
+ */
+DECL_NO_INLINE(static, void) EnsureNoUnload(HMODULE hModule)
+{
+    WCHAR wszName[RTPATH_MAX];
+    SetLastError(NO_ERROR);
+    if (   GetModuleFileNameW(hModule, wszName, RT_ELEMENTS(wszName)) > 0
+        && GetLastError() == NO_ERROR)
+    {
+        int cExtraLoads = 32;
+        while (cExtraLoads-- > 0)
+            LoadLibraryW(wszName);
+    }
+}
+
+
+/**
+ * The Dll main entry point.
+ */
+BOOL __stdcall DllMain(HANDLE hModule, DWORD dwReason, PVOID pvReserved)
+{
+    RT_NOREF_PV(pvReserved);
+
+    switch (dwReason)
+    {
+        /*
+         * When attaching to a process, we'd like to make sure IPRT stays put
+         * and doesn't get unloaded.
+         */
+        case DLL_PROCESS_ATTACH:
+            EnsureNoUnload((HMODULE)hModule);
+            break;
+
+        case DLL_PROCESS_DETACH:
+        case DLL_THREAD_ATTACH:
+        default:
+            /* ignore */
+            break;
+
+        case DLL_THREAD_DETACH:
+            rtThreadWinTlsDestruction();
+            rtThreadNativeDetach();
+            break;
+    }
+    return TRUE;
+}
+
diff --git a/src/VBox/Runtime/r3/win/env-win.cpp b/src/VBox/Runtime/r3/win/env-win.cpp
new file mode 100644
index 00000000..09bf85e2
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/env-win.cpp
@@ -0,0 +1,290 @@
+/* $Id: env-win.cpp $ */
+/** @file
+ * IPRT - Environment, Posix.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/env.h>
+
+#include <iprt/alloca.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/string.h>
+#include <iprt/mem.h>
+#include <iprt/utf16.h>
+
+#include <stdlib.h>
+#include <errno.h>
+
+
+RTDECL(bool) RTEnvExistsBad(const char *pszVar)
+{
+    return RTEnvGetBad(pszVar) != NULL;
+}
+
+
+RTDECL(bool) RTEnvExist(const char *pszVar)
+{
+    return RTEnvExistsBad(pszVar);
+}
+
+
+RTDECL(bool) RTEnvExistsUtf8(const char *pszVar)
+{
+    AssertReturn(strchr(pszVar, '=') == NULL, false);
+
+    PRTUTF16 pwszVar;
+    int rc = RTStrToUtf16(pszVar, &pwszVar);
+    AssertRCReturn(rc, false);
+    bool fRet = _wgetenv(pwszVar) != NULL;
+    RTUtf16Free(pwszVar);
+    return fRet;
+}
+
+
+RTDECL(const char *) RTEnvGetBad(const char *pszVar)
+{
+    AssertReturn(strchr(pszVar, '=') == NULL, NULL);
+    return getenv(pszVar);
+}
+
+
+RTDECL(const char *) RTEnvGet(const char *pszVar)
+{
+    return RTEnvGetBad(pszVar);
+}
+
+RTDECL(int) RTEnvGetUtf8(const char *pszVar, char *pszValue, size_t cbValue, size_t *pcchActual)
+{
+    AssertPtrReturn(pszVar, VERR_INVALID_POINTER);
+    AssertPtrNullReturn(pszValue, VERR_INVALID_POINTER);
+    AssertReturn(pszValue || !cbValue, VERR_INVALID_PARAMETER);
+    AssertPtrNullReturn(pcchActual, VERR_INVALID_POINTER);
+    AssertReturn(pcchActual || (pszValue && cbValue), VERR_INVALID_PARAMETER);
+    AssertReturn(strchr(pszVar, '=') == NULL, VERR_ENV_INVALID_VAR_NAME);
+
+    if (pcchActual)
+        *pcchActual = 0;
+
+    PRTUTF16 pwszVar;
+    int rc = RTStrToUtf16(pszVar, &pwszVar);
+    AssertRCReturn(rc, rc);
+
+    /** @todo Consider _wgetenv_s or GetEnvironmentVariableW here to avoid the
+     *        potential race with a concurrent _wputenv/_putenv. */
+    PCRTUTF16 pwszValue = _wgetenv(pwszVar);
+    RTUtf16Free(pwszVar);
+    if (pwszValue)
+    {
+        if (cbValue)
+            rc = RTUtf16ToUtf8Ex(pwszValue, RTSTR_MAX, &pszValue, cbValue, pcchActual);
+        else
+            rc = RTUtf16CalcUtf8LenEx(pwszValue, RTSTR_MAX, pcchActual);
+    }
+    else
+        rc = VERR_ENV_VAR_NOT_FOUND;
+    return rc;
+}
+
+
+RTDECL(int) RTEnvPutBad(const char *pszVarEqualValue)
+{
+    /** @todo putenv is a source memory leaks. deal with this on a per system basis. */
+    if (!putenv((char *)pszVarEqualValue))
+        return 0;
+    return RTErrConvertFromErrno(errno);
+}
+
+
+RTDECL(int) RTEnvPut(const char *pszVarEqualValue)
+{
+    return RTEnvPutBad(pszVarEqualValue);
+}
+
+
+RTDECL(int) RTEnvPutUtf8(const char *pszVarEqualValue)
+{
+    PRTUTF16 pwszVarEqualValue;
+    int rc = RTStrToUtf16(pszVarEqualValue, &pwszVarEqualValue);
+    if (RT_SUCCESS(rc))
+    {
+        if (!_wputenv(pwszVarEqualValue))
+            rc = VINF_SUCCESS;
+        else
+            rc = RTErrConvertFromErrno(errno);
+        RTUtf16Free(pwszVarEqualValue);
+    }
+    return rc;
+}
+
+
+
+RTDECL(int) RTEnvSetBad(const char *pszVar, const char *pszValue)
+{
+    AssertMsgReturn(strchr(pszVar, '=') == NULL, ("'%s'\n", pszVar), VERR_ENV_INVALID_VAR_NAME);
+
+    /* make a local copy and feed it to putenv. */
+    const size_t cchVar = strlen(pszVar);
+    const size_t cchValue = strlen(pszValue);
+    char *pszTmp = (char *)alloca(cchVar + cchValue + 2 + !*pszValue);
+    memcpy(pszTmp, pszVar, cchVar);
+    pszTmp[cchVar] = '=';
+    if (*pszValue)
+        memcpy(pszTmp + cchVar + 1, pszValue, cchValue + 1);
+    else
+    {
+        pszTmp[cchVar + 1] = ' '; /* wrong, but putenv will remove it otherwise. */
+        pszTmp[cchVar + 2] = '\0';
+    }
+
+    if (!putenv(pszTmp))
+        return 0;
+    return RTErrConvertFromErrno(errno);
+}
+
+
+RTDECL(int) RTEnvSet(const char *pszVar, const char *pszValue)
+{
+    return RTEnvSetBad(pszVar, pszValue);
+}
+
+
+/**
+ * Worker common to RTEnvSetUtf8() and rtEnvSetExWorker().
+ */
+int rtEnvSetUtf8Worker(const char *pchVar, size_t cchVar, const char *pszValue)
+{
+    size_t cwcVar;
+    int rc = RTStrCalcUtf16LenEx(pchVar, cchVar, &cwcVar);
+    if (RT_SUCCESS(rc))
+    {
+        size_t cwcValue;
+        rc = RTStrCalcUtf16LenEx(pszValue, RTSTR_MAX, &cwcValue);
+        if (RT_SUCCESS(rc))
+        {
+            PRTUTF16 pwszTmp = (PRTUTF16)RTMemTmpAlloc((cwcVar + 1 + cwcValue + 1) * sizeof(RTUTF16));
+            if (pwszTmp)
+            {
+                rc = RTStrToUtf16Ex(pchVar, cchVar, &pwszTmp, cwcVar + 1, NULL);
+                if (RT_SUCCESS(rc))
+                {
+                    PRTUTF16 pwszTmpValue = &pwszTmp[cwcVar];
+                    *pwszTmpValue++ = '=';
+                    rc = RTStrToUtf16Ex(pszValue, RTSTR_MAX, &pwszTmpValue, cwcValue + 1, NULL);
+                    if (RT_SUCCESS(rc))
+                    {
+                        if (!_wputenv(pwszTmp))
+                            rc = VINF_SUCCESS;
+                        else
+                            rc = RTErrConvertFromErrno(errno);
+                    }
+                }
+                RTMemTmpFree(pwszTmp);
+            }
+            else
+                rc = VERR_NO_TMP_MEMORY;
+        }
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTEnvSetUtf8(const char *pszVar, const char *pszValue)
+{
+    size_t cchVar = strlen(pszVar);
+    AssertReturn(memchr(pszVar, '=', cchVar) == NULL, VERR_ENV_INVALID_VAR_NAME);
+    return rtEnvSetUtf8Worker(pszVar, cchVar, pszValue);
+}
+
+
+RTDECL(int) RTEnvUnsetBad(const char *pszVar)
+{
+    AssertReturn(strchr(pszVar, '=') == NULL, VERR_ENV_INVALID_VAR_NAME);
+
+    /*
+     * Check that it exists first.
+     */
+    if (!RTEnvExist(pszVar))
+        return VINF_ENV_VAR_NOT_FOUND;
+
+    /*
+     * Ok, try remove it.
+     */
+#ifdef RT_OS_WINDOWS
+    /* Use putenv(var=) since Windows does not have unsetenv(). */
+    size_t cchVar = strlen(pszVar);
+    char *pszBuf = (char *)alloca(cchVar + 2);
+    memcpy(pszBuf, pszVar, cchVar);
+    pszBuf[cchVar]     = '=';
+    pszBuf[cchVar + 1] = '\0';
+
+    if (!putenv(pszBuf))
+        return VINF_SUCCESS;
+
+#else
+    /* This is the preferred function as putenv() like used above does neither work on Solaris nor on Darwin. */
+    if (!unsetenv((char*)pszVar))
+        return VINF_SUCCESS;
+#endif
+
+    return RTErrConvertFromErrno(errno);
+}
+
+
+RTDECL(int) RTEnvUnset(const char *pszVar)
+{
+    return RTEnvUnsetBad(pszVar);
+}
+
+
+RTDECL(int) RTEnvUnsetUtf8(const char *pszVar)
+{
+    AssertReturn(strchr(pszVar, '=') == NULL, VERR_ENV_INVALID_VAR_NAME);
+
+    size_t cwcVar;
+    int rc = RTStrCalcUtf16LenEx(pszVar, RTSTR_MAX, &cwcVar);
+    if (RT_SUCCESS(rc))
+    {
+        PRTUTF16 pwszTmp = (PRTUTF16)RTMemTmpAlloc((cwcVar + 1 + 1) * sizeof(RTUTF16));
+        if (pwszTmp)
+        {
+            rc = RTStrToUtf16Ex(pszVar, RTSTR_MAX, &pwszTmp, cwcVar + 1, NULL);
+            if (RT_SUCCESS(rc))
+            {
+                pwszTmp[cwcVar] = '=';
+                pwszTmp[cwcVar + 1] = '\0';
+                if (!_wputenv(pwszTmp))
+                    rc = VINF_SUCCESS;
+                else
+                    rc = RTErrConvertFromErrno(errno);
+            }
+            RTMemTmpFree(pwszTmp);
+        }
+    }
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/errvars-win.cpp b/src/VBox/Runtime/r3/win/errvars-win.cpp
new file mode 100644
index 00000000..3dee2f07
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/errvars-win.cpp
@@ -0,0 +1,85 @@
+/* $Id: errvars-win.cpp $ */
+/** @file
+ * IPRT - Save and Restore Error Variables, Windows Ring-3.
+ */
+
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/winsock2.h>
+#include <errno.h>
+
+#include <iprt/errcore.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include "internal/magics.h"
+#include "internal-r3-win.h"
+
+
+
+RTDECL(PRTERRVARS) RTErrVarsSave(PRTERRVARS pVars)
+{
+    pVars->ai32Vars[0] = RTERRVARS_MAGIC;
+    pVars->ai32Vars[1] = GetLastError();
+    pVars->ai32Vars[2] = g_pfnWSAGetLastError ? g_pfnWSAGetLastError() : WSANOTINITIALISED;
+    pVars->ai32Vars[3] = errno;
+    return pVars;
+}
+
+
+RTDECL(void) RTErrVarsRestore(PCRTERRVARS pVars)
+{
+    AssertReturnVoid(pVars->ai32Vars[0] == RTERRVARS_MAGIC);
+    errno = pVars->ai32Vars[3];
+    if (   pVars->ai32Vars[2] != WSANOTINITIALISED
+        && g_pfnWSASetLastError)
+        g_pfnWSASetLastError(pVars->ai32Vars[2]);
+    SetLastError(pVars->ai32Vars[1]);
+}
+
+
+RTDECL(bool) RTErrVarsAreEqual(PCRTERRVARS pVars1, PCRTERRVARS pVars2)
+{
+    Assert(pVars1->ai32Vars[0] == RTERRVARS_MAGIC);
+    Assert(pVars2->ai32Vars[0] == RTERRVARS_MAGIC);
+
+    return pVars1->ai32Vars[0] == pVars2->ai32Vars[0]
+        && pVars1->ai32Vars[1] == pVars2->ai32Vars[1]
+        && pVars1->ai32Vars[2] == pVars2->ai32Vars[2]
+        && pVars1->ai32Vars[3] == pVars2->ai32Vars[3];
+}
+
+
+RTDECL(bool) RTErrVarsHaveChanged(PCRTERRVARS pVars)
+{
+    Assert(pVars->ai32Vars[0] == RTERRVARS_MAGIC);
+
+    return pVars->ai32Vars[0] != RTERRVARS_MAGIC
+        || (uint32_t)pVars->ai32Vars[1] != GetLastError()
+        || pVars->ai32Vars[2] != (g_pfnWSAGetLastError ? g_pfnWSAGetLastError() : WSANOTINITIALISED)
+        || pVars->ai32Vars[3] != errno;
+}
+
diff --git a/src/VBox/Runtime/r3/win/fileaio-win.cpp b/src/VBox/Runtime/r3/win/fileaio-win.cpp
new file mode 100644
index 00000000..12ffc3c9
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/fileaio-win.cpp
@@ -0,0 +1,534 @@
+/* $Id: fileaio-win.cpp $ */
+/** @file
+ * IPRT - File async I/O, native implementation for the Windows host platform.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_DIR
+
+#include <iprt/asm.h>
+#include <iprt/file.h>
+#include <iprt/mem.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/err.h>
+#include <iprt/log.h>
+#include "internal/fileaio.h"
+
+#include <iprt/win/windows.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+
+/**
+ * Transfer direction.
+ */
+typedef enum TRANSFERDIRECTION
+{
+    TRANSFERDIRECTION_INVALID = 0,
+    /** Read. */
+    TRANSFERDIRECTION_READ,
+    /** Write. */
+    TRANSFERDIRECTION_WRITE,
+    /** The usual 32-bit hack. */
+    TRANSFERDIRECTION_32BIT_HACK = 0x7fffffff
+} TRANSFERDIRECTION;
+
+/**
+ * Async I/O completion context state.
+ */
+typedef struct RTFILEAIOCTXINTERNAL
+{
+    /** handle to I/O completion port. */
+    HANDLE            hIoCompletionPort;
+    /** Current number of requests pending. */
+    volatile int32_t  cRequests;
+    /** Flag whether the thread was woken up. */
+    volatile bool     fWokenUp;
+    /** Flag whether the thread is currently waiting. */
+    volatile bool     fWaiting;
+    /** Flags given during creation. */
+    uint32_t          fFlags;
+    /** Magic value (RTFILEAIOCTX_MAGIC). */
+    uint32_t          u32Magic;
+} RTFILEAIOCTXINTERNAL;
+/** Pointer to an internal context structure. */
+typedef RTFILEAIOCTXINTERNAL *PRTFILEAIOCTXINTERNAL;
+
+/**
+ * Async I/O request state.
+ */
+typedef struct RTFILEAIOREQINTERNAL
+{
+    /** Overlapped structure. */
+    OVERLAPPED            Overlapped;
+    /** Current state the request is in. */
+    RTFILEAIOREQSTATE     enmState;
+    /** The file handle. */
+    HANDLE                hFile;
+    /** Kind of transfer Read/Write. */
+    TRANSFERDIRECTION     enmTransferDirection;
+    /** Number of bytes to transfer. */
+    size_t                cbTransfer;
+    /** Pointer to the buffer. */
+    void                 *pvBuf;
+    /** Opaque user data. */
+    void                 *pvUser;
+    /** Flag whether the request completed. */
+    bool                  fCompleted;
+    /** Number of bytes transferred successfully. */
+    size_t                cbTransfered;
+    /** Error code of the completed request. */
+    int                   Rc;
+    /** Completion context we are assigned to. */
+    PRTFILEAIOCTXINTERNAL pCtxInt;
+    /** Magic value  (RTFILEAIOREQ_MAGIC). */
+    uint32_t              u32Magic;
+} RTFILEAIOREQINTERNAL;
+/** Pointer to an internal request structure. */
+typedef RTFILEAIOREQINTERNAL *PRTFILEAIOREQINTERNAL;
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Id for the wakeup event. */
+#define AIO_CONTEXT_WAKEUP_EVENT 1
+/** Converts a pointer to an OVERLAPPED structure to a internal request. */
+#define OVERLAPPED_2_RTFILEAIOREQINTERNAL(pOverlapped) ( (PRTFILEAIOREQINTERNAL)((uintptr_t)(pOverlapped) - RT_UOFFSETOF(RTFILEAIOREQINTERNAL, Overlapped)) )
+
+RTR3DECL(int) RTFileAioGetLimits(PRTFILEAIOLIMITS pAioLimits)
+{
+    AssertPtrReturn(pAioLimits, VERR_INVALID_POINTER);
+
+    /* No limits known. */
+    pAioLimits->cReqsOutstandingMax = RTFILEAIO_UNLIMITED_REQS;
+    pAioLimits->cbBufferAlignment   = 0;
+
+    return VINF_SUCCESS;
+}
+
+RTR3DECL(int) RTFileAioReqCreate(PRTFILEAIOREQ phReq)
+{
+    AssertPtrReturn(phReq, VERR_INVALID_POINTER);
+
+    PRTFILEAIOREQINTERNAL pReqInt = (PRTFILEAIOREQINTERNAL)RTMemAllocZ(sizeof(RTFILEAIOREQINTERNAL));
+    if (RT_UNLIKELY(!pReqInt))
+        return VERR_NO_MEMORY;
+
+    pReqInt->pCtxInt    = NULL;
+    pReqInt->fCompleted = false;
+    pReqInt->u32Magic   = RTFILEAIOREQ_MAGIC;
+    RTFILEAIOREQ_SET_STATE(pReqInt, COMPLETED);
+
+    *phReq = (RTFILEAIOREQ)pReqInt;
+
+    return VINF_SUCCESS;
+}
+
+RTDECL(int) RTFileAioReqDestroy(RTFILEAIOREQ hReq)
+{
+    /*
+     * Validate the handle and ignore nil.
+     */
+    if (hReq == NIL_RTFILEAIOREQ)
+        return VINF_SUCCESS;
+    PRTFILEAIOREQINTERNAL pReqInt = hReq;
+    RTFILEAIOREQ_VALID_RETURN(pReqInt);
+    RTFILEAIOREQ_NOT_STATE_RETURN_RC(pReqInt, SUBMITTED, VERR_FILE_AIO_IN_PROGRESS);
+
+    /*
+     * Trash the magic and free it.
+     */
+    ASMAtomicUoWriteU32(&pReqInt->u32Magic, ~RTFILEAIOREQ_MAGIC);
+    RTMemFree(pReqInt);
+    return VINF_SUCCESS;
+}
+
+/**
+ * Worker setting up the request.
+ */
+DECLINLINE(int) rtFileAioReqPrepareTransfer(RTFILEAIOREQ hReq, RTFILE hFile,
+                                            TRANSFERDIRECTION enmTransferDirection,
+                                            RTFOFF off, void *pvBuf, size_t cbTransfer,
+                                            void *pvUser)
+{
+    /*
+     * Validate the input.
+     */
+    PRTFILEAIOREQINTERNAL pReqInt = hReq;
+    RTFILEAIOREQ_VALID_RETURN(pReqInt);
+    RTFILEAIOREQ_NOT_STATE_RETURN_RC(pReqInt, SUBMITTED, VERR_FILE_AIO_IN_PROGRESS);
+    Assert(hFile != NIL_RTFILE);
+    AssertPtr(pvBuf);
+    Assert(off >= 0);
+    Assert(cbTransfer > 0);
+
+    pReqInt->enmTransferDirection  = enmTransferDirection;
+    pReqInt->hFile                 = (HANDLE)RTFileToNative(hFile);
+    pReqInt->Overlapped.Offset     = (DWORD)(off & 0xffffffff);
+    pReqInt->Overlapped.OffsetHigh = (DWORD)(off >> 32);
+    pReqInt->cbTransfer            = cbTransfer;
+    pReqInt->pvBuf                 = pvBuf;
+    pReqInt->pvUser                = pvUser;
+    pReqInt->fCompleted            = false;
+
+    return VINF_SUCCESS;
+}
+
+RTDECL(int) RTFileAioReqPrepareRead(RTFILEAIOREQ hReq, RTFILE hFile, RTFOFF off,
+                                    void *pvBuf, size_t cbRead, void *pvUser)
+{
+    return rtFileAioReqPrepareTransfer(hReq, hFile, TRANSFERDIRECTION_READ,
+                                       off, pvBuf, cbRead, pvUser);
+}
+
+RTDECL(int) RTFileAioReqPrepareWrite(RTFILEAIOREQ hReq, RTFILE hFile, RTFOFF off,
+                                     void const *pvBuf, size_t cbWrite, void *pvUser)
+{
+    return rtFileAioReqPrepareTransfer(hReq, hFile, TRANSFERDIRECTION_WRITE,
+                                       off, (void *)pvBuf, cbWrite, pvUser);
+}
+
+RTDECL(int) RTFileAioReqPrepareFlush(RTFILEAIOREQ hReq, RTFILE hFile, void *pvUser)
+{
+    PRTFILEAIOREQINTERNAL pReqInt = hReq;
+    RTFILEAIOREQ_VALID_RETURN(pReqInt);
+    RTFILEAIOREQ_NOT_STATE_RETURN_RC(pReqInt, SUBMITTED, VERR_FILE_AIO_IN_PROGRESS);
+    AssertReturn(hFile != NIL_RTFILE, VERR_INVALID_HANDLE);
+    RT_NOREF_PV(pvUser);
+
+    return VERR_NOT_SUPPORTED;
+}
+
+RTDECL(void *) RTFileAioReqGetUser(RTFILEAIOREQ hReq)
+{
+    PRTFILEAIOREQINTERNAL pReqInt = hReq;
+    RTFILEAIOREQ_VALID_RETURN_RC(pReqInt, NULL);
+
+    return pReqInt->pvUser;
+}
+
+RTDECL(int) RTFileAioReqCancel(RTFILEAIOREQ hReq)
+{
+    PRTFILEAIOREQINTERNAL pReqInt = hReq;
+    RTFILEAIOREQ_VALID_RETURN(pReqInt);
+    RTFILEAIOREQ_STATE_RETURN_RC(pReqInt, SUBMITTED, VERR_FILE_AIO_NOT_SUBMITTED);
+
+    /**
+     * @todo r=aeichner It is not possible to cancel specific
+     * requests on Windows before Vista.
+     * CancelIo cancels all requests for a file issued by the
+     * calling thread and CancelIoEx which does what we need
+     * is only available from Vista and up.
+     * The solution is to return VERR_FILE_AIO_IN_PROGRESS
+     * if the request didn't completed yet (checked above).
+     * Shouldn't be a big issue because a request is normally
+     * only canceled if it exceeds a timeout which is quite huge.
+     */
+    return VERR_FILE_AIO_COMPLETED;
+}
+
+RTDECL(int) RTFileAioReqGetRC(RTFILEAIOREQ hReq, size_t *pcbTransfered)
+{
+    int rc = VINF_SUCCESS;
+    PRTFILEAIOREQINTERNAL pReqInt = hReq;
+    RTFILEAIOREQ_VALID_RETURN(pReqInt);
+    RTFILEAIOREQ_NOT_STATE_RETURN_RC(pReqInt, SUBMITTED, VERR_FILE_AIO_IN_PROGRESS);
+    RTFILEAIOREQ_NOT_STATE_RETURN_RC(pReqInt, PREPARED, VERR_FILE_AIO_NOT_SUBMITTED);
+
+    rc = pReqInt->Rc;
+    if (pcbTransfered && RT_SUCCESS(rc))
+        *pcbTransfered = pReqInt->cbTransfered;
+
+    return rc;
+}
+
+RTDECL(int) RTFileAioCtxCreate(PRTFILEAIOCTX phAioCtx, uint32_t cAioReqsMax, uint32_t fFlags)
+{
+    PRTFILEAIOCTXINTERNAL pCtxInt;
+    AssertPtrReturn(phAioCtx, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTFILEAIOCTX_FLAGS_VALID_MASK), VERR_INVALID_PARAMETER);
+    RT_NOREF_PV(cAioReqsMax);
+
+    pCtxInt = (PRTFILEAIOCTXINTERNAL)RTMemAllocZ(sizeof(RTFILEAIOCTXINTERNAL));
+    if (RT_UNLIKELY(!pCtxInt))
+        return VERR_NO_MEMORY;
+
+    pCtxInt->hIoCompletionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE,
+                                                        NULL,
+                                                        0,
+                                                        0);
+    if (RT_UNLIKELY(!pCtxInt->hIoCompletionPort))
+    {
+        RTMemFree(pCtxInt);
+        return VERR_NO_MEMORY;
+    }
+
+    pCtxInt->fFlags   = fFlags;
+    pCtxInt->u32Magic = RTFILEAIOCTX_MAGIC;
+
+    *phAioCtx = (RTFILEAIOCTX)pCtxInt;
+
+    return VINF_SUCCESS;
+}
+
+RTDECL(int) RTFileAioCtxDestroy(RTFILEAIOCTX hAioCtx)
+{
+    /* Validate the handle and ignore nil. */
+    if (hAioCtx == NIL_RTFILEAIOCTX)
+        return VINF_SUCCESS;
+    PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
+    RTFILEAIOCTX_VALID_RETURN(pCtxInt);
+
+    /* Cannot destroy a busy context. */
+    if (RT_UNLIKELY(pCtxInt->cRequests))
+        return VERR_FILE_AIO_BUSY;
+
+    CloseHandle(pCtxInt->hIoCompletionPort);
+    ASMAtomicUoWriteU32(&pCtxInt->u32Magic, RTFILEAIOCTX_MAGIC_DEAD);
+    RTMemFree(pCtxInt);
+
+    return VINF_SUCCESS;
+}
+
+RTDECL(int) RTFileAioCtxAssociateWithFile(RTFILEAIOCTX hAioCtx, RTFILE hFile)
+{
+    int rc = VINF_SUCCESS;
+    PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
+    RTFILEAIOCTX_VALID_RETURN(pCtxInt);
+
+    HANDLE hTemp = CreateIoCompletionPort((HANDLE)RTFileToNative(hFile), pCtxInt->hIoCompletionPort, 0, 1);
+    if (hTemp != pCtxInt->hIoCompletionPort)
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    return rc;
+}
+
+RTDECL(uint32_t) RTFileAioCtxGetMaxReqCount(RTFILEAIOCTX hAioCtx)
+{
+    RT_NOREF_PV(hAioCtx);
+    return RTFILEAIO_UNLIMITED_REQS;
+}
+
+RTDECL(int) RTFileAioCtxSubmit(RTFILEAIOCTX hAioCtx, PRTFILEAIOREQ pahReqs, size_t cReqs)
+{
+    /*
+     * Parameter validation.
+     */
+    int rc = VINF_SUCCESS;
+    PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
+    RTFILEAIOCTX_VALID_RETURN(pCtxInt);
+    AssertReturn(cReqs > 0,  VERR_INVALID_PARAMETER);
+    Assert(cReqs <= INT32_MAX);
+    AssertPtrReturn(pahReqs, VERR_INVALID_POINTER);
+    size_t i;
+
+    for (i = 0; i < cReqs; i++)
+    {
+        PRTFILEAIOREQINTERNAL pReqInt = pahReqs[i];
+        BOOL fSucceeded;
+
+        Assert(pReqInt->cbTransfer == (DWORD)pReqInt->cbTransfer);
+        if (pReqInt->enmTransferDirection == TRANSFERDIRECTION_READ)
+        {
+            fSucceeded = ReadFile(pReqInt->hFile, pReqInt->pvBuf,
+                                  (DWORD)pReqInt->cbTransfer, NULL,
+                                  &pReqInt->Overlapped);
+        }
+        else if (pReqInt->enmTransferDirection == TRANSFERDIRECTION_WRITE)
+        {
+            fSucceeded = WriteFile(pReqInt->hFile, pReqInt->pvBuf,
+                                   (DWORD)pReqInt->cbTransfer, NULL,
+                                   &pReqInt->Overlapped);
+        }
+        else
+        {
+            fSucceeded = false;
+            AssertMsgFailed(("Invalid transfer direction\n"));
+        }
+
+        if (RT_UNLIKELY(!fSucceeded && GetLastError() != ERROR_IO_PENDING))
+        {
+            RTFILEAIOREQ_SET_STATE(pReqInt, COMPLETED);
+            rc = RTErrConvertFromWin32(GetLastError());
+            pReqInt->Rc = rc;
+            break;
+        }
+        RTFILEAIOREQ_SET_STATE(pReqInt, SUBMITTED);
+    }
+
+    ASMAtomicAddS32(&pCtxInt->cRequests, (int32_t)i);
+
+    return rc;
+}
+
+RTDECL(int) RTFileAioCtxWait(RTFILEAIOCTX hAioCtx, size_t cMinReqs, RTMSINTERVAL cMillies,
+                             PRTFILEAIOREQ pahReqs, size_t cReqs, uint32_t *pcReqs)
+{
+    /*
+     * Validate the parameters, making sure to always set pcReqs.
+     */
+    AssertPtrReturn(pcReqs, VERR_INVALID_POINTER);
+    *pcReqs = 0; /* always set */
+    PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
+    RTFILEAIOCTX_VALID_RETURN(pCtxInt);
+    AssertPtrReturn(pahReqs, VERR_INVALID_POINTER);
+    AssertReturn(cReqs != 0, VERR_INVALID_PARAMETER);
+    AssertReturn(cReqs >= cMinReqs, VERR_OUT_OF_RANGE);
+
+    /*
+     * Can't wait if there are no requests around.
+     */
+    if (   RT_UNLIKELY(ASMAtomicUoReadS32(&pCtxInt->cRequests) == 0)
+        && !(pCtxInt->fFlags & RTFILEAIOCTX_FLAGS_WAIT_WITHOUT_PENDING_REQUESTS))
+        return VERR_FILE_AIO_NO_REQUEST;
+
+    /* Wait for at least one. */
+    if (!cMinReqs)
+        cMinReqs = 1;
+
+    /*
+     * Loop until we're woken up, hit an error (incl timeout), or
+     * have collected the desired number of requests.
+     */
+    int rc = VINF_SUCCESS;
+    int cRequestsCompleted = 0;
+    while (   !pCtxInt->fWokenUp
+           && cMinReqs > 0)
+    {
+        uint64_t     StartNanoTS = 0;
+        DWORD        dwTimeout = cMillies == RT_INDEFINITE_WAIT ? INFINITE : cMillies;
+        DWORD        cbTransfered;
+        LPOVERLAPPED pOverlapped;
+        ULONG_PTR    lCompletionKey;
+        BOOL         fSucceeded;
+
+        if (cMillies != RT_INDEFINITE_WAIT)
+            StartNanoTS = RTTimeNanoTS();
+
+        ASMAtomicXchgBool(&pCtxInt->fWaiting, true);
+        fSucceeded = GetQueuedCompletionStatus(pCtxInt->hIoCompletionPort,
+                                               &cbTransfered,
+                                               &lCompletionKey,
+                                               &pOverlapped,
+                                               dwTimeout);
+        ASMAtomicXchgBool(&pCtxInt->fWaiting, false);
+        if (   !fSucceeded
+            && !pOverlapped)
+        {
+            /* The call failed to dequeue a completion packet, includes VERR_TIMEOUT */
+            rc = RTErrConvertFromWin32(GetLastError());
+            break;
+        }
+
+        /* Check if we got woken up. */
+        if (lCompletionKey == AIO_CONTEXT_WAKEUP_EVENT)
+        {
+            Assert(fSucceeded && !pOverlapped);
+            break;
+        }
+
+        /* A request completed. */
+        PRTFILEAIOREQINTERNAL pReqInt = OVERLAPPED_2_RTFILEAIOREQINTERNAL(pOverlapped);
+        AssertPtr(pReqInt);
+        Assert(pReqInt->u32Magic == RTFILEAIOREQ_MAGIC);
+
+        /* Mark the request as finished. */
+        RTFILEAIOREQ_SET_STATE(pReqInt, COMPLETED);
+
+        pReqInt->cbTransfered = cbTransfered;
+        if (fSucceeded)
+            pReqInt->Rc = VINF_SUCCESS;
+        else
+        {
+            DWORD errCode = GetLastError();
+            pReqInt->Rc = RTErrConvertFromWin32(errCode);
+            if (pReqInt->Rc == VERR_UNRESOLVED_ERROR)
+                LogRel(("AIO/win: Request %#p returned rc=%Rrc (native %u\n)", pReqInt, pReqInt->Rc, errCode));
+        }
+
+        pahReqs[cRequestsCompleted++] = (RTFILEAIOREQ)pReqInt;
+
+        /* Update counter. */
+        cMinReqs--;
+
+        if (cMillies != RT_INDEFINITE_WAIT)
+        {
+            /* Recalculate timeout. */
+            uint64_t NanoTS = RTTimeNanoTS();
+            uint64_t cMilliesElapsed = (NanoTS - StartNanoTS) / 1000000;
+            if (cMilliesElapsed < cMillies)
+                cMillies -= cMilliesElapsed;
+            else
+                cMillies = 0;
+        }
+    }
+
+    /*
+     * Update the context state and set the return value.
+     */
+    *pcReqs = cRequestsCompleted;
+    ASMAtomicSubS32(&pCtxInt->cRequests, cRequestsCompleted);
+
+    /*
+     * Clear the wakeup flag and set rc.
+     */
+    bool fWokenUp = ASMAtomicXchgBool(&pCtxInt->fWokenUp, false);
+
+    if (    fWokenUp
+        &&  RT_SUCCESS(rc))
+        rc = VERR_INTERRUPTED;
+
+    return rc;
+}
+
+RTDECL(int) RTFileAioCtxWakeup(RTFILEAIOCTX hAioCtx)
+{
+    int rc = VINF_SUCCESS;
+    PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
+    RTFILEAIOCTX_VALID_RETURN(pCtxInt);
+
+    bool fWokenUp = ASMAtomicXchgBool(&pCtxInt->fWokenUp, true);
+    bool fWaiting = ASMAtomicReadBool(&pCtxInt->fWaiting);
+
+    if (   !fWokenUp
+        && fWaiting)
+    {
+        BOOL fSucceeded = PostQueuedCompletionStatus(pCtxInt->hIoCompletionPort,
+                                                     0, AIO_CONTEXT_WAKEUP_EVENT,
+                                                     NULL);
+
+        if (!fSucceeded)
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/fileio-win.cpp b/src/VBox/Runtime/r3/win/fileio-win.cpp
new file mode 100644
index 00000000..134d2414
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/fileio-win.cpp
@@ -0,0 +1,1513 @@
+/* $Id: fileio-win.cpp $ */
+/** @file
+ * IPRT - File I/O, native implementation for the Windows host platform.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_DIR
+#ifndef _WIN32_WINNT
+# define _WIN32_WINNT 0x0500
+#endif
+#include <iprt/nt/nt-and-windows.h>
+
+#include <iprt/file.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/err.h>
+#include <iprt/ldr.h>
+#include <iprt/log.h>
+#include <iprt/utf16.h>
+#include "internal/file.h"
+#include "internal/fs.h"
+#include "internal/path.h"
+#include "internal-r3-win.h" /* For g_enmWinVer + kRTWinOSType_XXX */
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+typedef BOOL WINAPI FNVERIFYCONSOLEIOHANDLE(HANDLE);
+typedef FNVERIFYCONSOLEIOHANDLE *PFNVERIFYCONSOLEIOHANDLE; /* No, nobody fell on the keyboard, really! */
+
+
+/**
+ * This is wrapper around the ugly SetFilePointer api.
+ *
+ * It's equivalent to SetFilePointerEx which we so unfortunately cannot use because of
+ * it not being present in NT4 GA.
+ *
+ * @returns Success indicator. Extended error information obtainable using GetLastError().
+ * @param   hFile       Filehandle.
+ * @param   offSeek     Offset to seek.
+ * @param   poffNew     Where to store the new file offset. NULL allowed.
+ * @param   uMethod     Seek method. (The windows one!)
+ */
+DECLINLINE(bool) MySetFilePointer(RTFILE hFile, uint64_t offSeek, uint64_t *poffNew, unsigned uMethod)
+{
+    bool            fRc;
+    LARGE_INTEGER   off;
+
+    off.QuadPart = offSeek;
+#if 1
+    if (off.LowPart != INVALID_SET_FILE_POINTER)
+    {
+        off.LowPart = SetFilePointer((HANDLE)RTFileToNative(hFile), off.LowPart, &off.HighPart, uMethod);
+        fRc = off.LowPart != INVALID_SET_FILE_POINTER;
+    }
+    else
+    {
+        SetLastError(NO_ERROR);
+        off.LowPart = SetFilePointer((HANDLE)RTFileToNative(hFile), off.LowPart, &off.HighPart, uMethod);
+        fRc = GetLastError() == NO_ERROR;
+    }
+#else
+    fRc = SetFilePointerEx((HANDLE)RTFileToNative(hFile), off, &off, uMethod);
+#endif
+    if (fRc && poffNew)
+        *poffNew = off.QuadPart;
+    return fRc;
+}
+
+
+/**
+ * Helper for checking if a VERR_DISK_FULL isn't a VERR_FILE_TOO_BIG.
+ * @returns VERR_DISK_FULL or VERR_FILE_TOO_BIG.
+ */
+static int rtFileWinCheckIfDiskReallyFull(RTFILE hFile, uint64_t cbDesired)
+{
+    /*
+     * Windows doesn't appear to have a way to query the file size limit of a
+     * file system, so we have to deduce the limit from the file system driver name.
+     * This means it will only work for known file systems.
+     */
+    if (cbDesired >= _2G - 1)
+    {
+        uint64_t cbMaxFile = UINT64_MAX;
+        RTFSTYPE enmFsType;
+        int rc = rtNtQueryFsType((HANDLE)RTFileToNative(hFile), &enmFsType);
+        if (RT_SUCCESS(rc))
+            switch (enmFsType)
+            {
+                case RTFSTYPE_NTFS:
+                case RTFSTYPE_EXFAT:
+                case RTFSTYPE_UDF:
+                    cbMaxFile = UINT64_C(0xffffffffffffffff); /* (May be limited by IFS.) */
+                    break;
+
+                case RTFSTYPE_ISO9660:
+                    cbMaxFile = 8 *_1T;
+                    break;
+
+                case RTFSTYPE_FAT:
+                    cbMaxFile = _4G;
+                    break;
+
+                case RTFSTYPE_HPFS:
+                    cbMaxFile = _2G;
+                    break;
+
+                default:
+                    break;
+            }
+        if (cbDesired >= cbMaxFile)
+            return VERR_FILE_TOO_BIG;
+    }
+    return VERR_DISK_FULL;
+}
+
+
+RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
+{
+    HANDLE h = (HANDLE)uNative;
+    AssertCompile(sizeof(h) == sizeof(uNative));
+    if (h == INVALID_HANDLE_VALUE)
+    {
+        AssertMsgFailed(("%p\n", uNative));
+        *pFile = NIL_RTFILE;
+        return VERR_INVALID_HANDLE;
+    }
+    *pFile = (RTFILE)h;
+    return VINF_SUCCESS;
+}
+
+
+RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE hFile)
+{
+    AssertReturn(hFile != NIL_RTFILE, (RTHCINTPTR)INVALID_HANDLE_VALUE);
+    return (RTHCINTPTR)hFile;
+}
+
+
+RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, uint64_t fOpen)
+{
+    return RTFileOpenEx(pszFilename, fOpen, pFile, NULL);
+}
+
+
+RTDECL(int) RTFileOpenEx(const char *pszFilename, uint64_t fOpen, PRTFILE phFile, PRTFILEACTION penmActionTaken)
+{
+    /*
+     * Validate input.
+     */
+    AssertReturn(phFile, VERR_INVALID_PARAMETER);
+    *phFile = NIL_RTFILE;
+    if (penmActionTaken)
+        *penmActionTaken = RTFILEACTION_INVALID;
+    AssertReturn(pszFilename, VERR_INVALID_PARAMETER);
+
+    /*
+     * Merge forced open flags and validate them.
+     */
+    int rc = rtFileRecalcAndValidateFlags(&fOpen);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Determine disposition, access, share mode, creation flags, and security attributes
+     * for the CreateFile API call.
+     */
+    DWORD dwCreationDisposition;
+    switch (fOpen & RTFILE_O_ACTION_MASK)
+    {
+        case RTFILE_O_OPEN:
+            dwCreationDisposition = fOpen & RTFILE_O_TRUNCATE ? TRUNCATE_EXISTING : OPEN_EXISTING;
+            break;
+        case RTFILE_O_OPEN_CREATE:
+            dwCreationDisposition = OPEN_ALWAYS;
+            break;
+        case RTFILE_O_CREATE:
+            dwCreationDisposition = CREATE_NEW;
+            break;
+        case RTFILE_O_CREATE_REPLACE:
+            dwCreationDisposition = CREATE_ALWAYS;
+            break;
+        default:
+            AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+    }
+
+    DWORD dwDesiredAccess;
+    switch (fOpen & RTFILE_O_ACCESS_MASK)
+    {
+        case RTFILE_O_READ:
+            dwDesiredAccess = FILE_GENERIC_READ; /* RTFILE_O_APPEND is ignored. */
+            break;
+        case RTFILE_O_WRITE:
+            dwDesiredAccess = fOpen & RTFILE_O_APPEND
+                            ? FILE_GENERIC_WRITE & ~FILE_WRITE_DATA
+                            : FILE_GENERIC_WRITE;
+            break;
+        case RTFILE_O_READWRITE:
+            dwDesiredAccess = fOpen & RTFILE_O_APPEND
+                            ? FILE_GENERIC_READ | (FILE_GENERIC_WRITE & ~FILE_WRITE_DATA)
+                            : FILE_GENERIC_READ | FILE_GENERIC_WRITE;
+            break;
+        case RTFILE_O_ATTR_ONLY:
+            if (fOpen & RTFILE_O_ACCESS_ATTR_MASK)
+            {
+                dwDesiredAccess = 0;
+                break;
+            }
+            RT_FALL_THRU();
+        default:
+            AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+    }
+    if (dwCreationDisposition == TRUNCATE_EXISTING)
+        /* Required for truncating the file (see MSDN), it is *NOT* part of FILE_GENERIC_WRITE. */
+        dwDesiredAccess |= GENERIC_WRITE;
+
+    /* RTFileSetMode needs following rights as well. */
+    switch (fOpen & RTFILE_O_ACCESS_ATTR_MASK)
+    {
+        case RTFILE_O_ACCESS_ATTR_READ:      dwDesiredAccess |= FILE_READ_ATTRIBUTES  | SYNCHRONIZE; break;
+        case RTFILE_O_ACCESS_ATTR_WRITE:     dwDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+        case RTFILE_O_ACCESS_ATTR_READWRITE: dwDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+        default:
+            /* Attributes access is the same as the file access. */
+            switch (fOpen & RTFILE_O_ACCESS_MASK)
+            {
+                case RTFILE_O_READ:          dwDesiredAccess |= FILE_READ_ATTRIBUTES  | SYNCHRONIZE; break;
+                case RTFILE_O_WRITE:         dwDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+                case RTFILE_O_READWRITE:     dwDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+                default:
+                    AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+            }
+    }
+
+    DWORD dwShareMode;
+    switch (fOpen & RTFILE_O_DENY_MASK)
+    {
+        case RTFILE_O_DENY_NONE:                                dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_READ:                                dwShareMode = FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_WRITE:                               dwShareMode = FILE_SHARE_READ; break;
+        case RTFILE_O_DENY_READWRITE:                           dwShareMode = 0; break;
+
+        case RTFILE_O_DENY_NOT_DELETE:                          dwShareMode = FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READ:     dwShareMode = FILE_SHARE_DELETE | FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_WRITE:    dwShareMode = FILE_SHARE_DELETE | FILE_SHARE_READ; break;
+        case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READWRITE:dwShareMode = FILE_SHARE_DELETE; break;
+        default:
+            AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+    }
+
+    SECURITY_ATTRIBUTES  SecurityAttributes;
+    PSECURITY_ATTRIBUTES pSecurityAttributes = NULL;
+    if (fOpen & RTFILE_O_INHERIT)
+    {
+        SecurityAttributes.nLength              = sizeof(SecurityAttributes);
+        SecurityAttributes.lpSecurityDescriptor = NULL;
+        SecurityAttributes.bInheritHandle       = TRUE;
+        pSecurityAttributes = &SecurityAttributes;
+    }
+
+    DWORD dwFlagsAndAttributes;
+    dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
+    if (fOpen & RTFILE_O_WRITE_THROUGH)
+        dwFlagsAndAttributes |= FILE_FLAG_WRITE_THROUGH;
+    if (fOpen & RTFILE_O_ASYNC_IO)
+        dwFlagsAndAttributes |= FILE_FLAG_OVERLAPPED;
+    if (fOpen & RTFILE_O_NO_CACHE)
+    {
+        dwFlagsAndAttributes |= FILE_FLAG_NO_BUFFERING;
+        dwDesiredAccess &= ~FILE_APPEND_DATA;
+    }
+
+    /*
+     * Open/Create the file.
+     */
+    PRTUTF16 pwszFilename;
+    rc = RTPathWinFromUtf8(&pwszFilename, pszFilename, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        HANDLE hFile = CreateFileW(pwszFilename,
+                                   dwDesiredAccess,
+                                   dwShareMode,
+                                   pSecurityAttributes,
+                                   dwCreationDisposition,
+                                   dwFlagsAndAttributes,
+                                   NULL);
+        DWORD const dwErr = GetLastError();
+        if (hFile != INVALID_HANDLE_VALUE)
+        {
+            /*
+             * Calculate the action taken value.
+             */
+            RTFILEACTION enmActionTaken;
+            switch (dwCreationDisposition)
+            {
+                case CREATE_NEW:
+                    enmActionTaken = RTFILEACTION_CREATED;
+                    break;
+                case CREATE_ALWAYS:
+                    AssertMsg(dwErr == ERROR_ALREADY_EXISTS || dwErr == NO_ERROR, ("%u\n", dwErr));
+                    enmActionTaken = dwErr == ERROR_ALREADY_EXISTS ? RTFILEACTION_REPLACED : RTFILEACTION_CREATED;
+                    break;
+                case OPEN_EXISTING:
+                    enmActionTaken = RTFILEACTION_OPENED;
+                    break;
+                case OPEN_ALWAYS:
+                    AssertMsg(dwErr == ERROR_ALREADY_EXISTS || dwErr == NO_ERROR, ("%u\n", dwErr));
+                    enmActionTaken = dwErr == ERROR_ALREADY_EXISTS ? RTFILEACTION_OPENED : RTFILEACTION_CREATED;
+                    break;
+                case TRUNCATE_EXISTING:
+                    enmActionTaken = RTFILEACTION_TRUNCATED;
+                    break;
+                default:
+                    AssertMsgFailed(("%d %#x\n", dwCreationDisposition, dwCreationDisposition));
+                    enmActionTaken = RTFILEACTION_INVALID;
+                    break;
+            }
+
+            /*
+             * Turn off indexing of directory through Windows Indexing Service if
+             * we created a new file or replaced an existing one.
+             */
+            if (   (fOpen & RTFILE_O_NOT_CONTENT_INDEXED)
+                && (   enmActionTaken == RTFILEACTION_CREATED
+                    || enmActionTaken == RTFILEACTION_REPLACED) )
+            {
+                /** @todo there must be a way to do this via the handle! */
+                if (!SetFileAttributesW(pwszFilename, FILE_ATTRIBUTE_NOT_CONTENT_INDEXED))
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            /*
+             * If RTFILEACTION_OPENED, we may need to truncate the file.
+             */
+            else if (  (fOpen & (RTFILE_O_TRUNCATE | RTFILE_O_ACTION_MASK)) == (RTFILE_O_TRUNCATE | RTFILE_O_OPEN_CREATE)
+                     && enmActionTaken == RTFILEACTION_OPENED)
+            {
+                if (SetEndOfFile(hFile))
+                    enmActionTaken = RTFILEACTION_TRUNCATED;
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            if (penmActionTaken)
+                *penmActionTaken = enmActionTaken;
+            if (RT_SUCCESS(rc))
+            {
+                *phFile = (RTFILE)hFile;
+                Assert((HANDLE)*phFile == hFile);
+                RTPathWinFree(pwszFilename);
+                return VINF_SUCCESS;
+            }
+
+            CloseHandle(hFile);
+        }
+        else
+        {
+            if (   penmActionTaken
+                && dwCreationDisposition == CREATE_NEW
+                && dwErr == ERROR_FILE_EXISTS)
+                *penmActionTaken = RTFILEACTION_ALREADY_EXISTS;
+            rc = RTErrConvertFromWin32(dwErr);
+        }
+        RTPathWinFree(pwszFilename);
+    }
+    return rc;
+}
+
+
+RTR3DECL(int)  RTFileOpenBitBucket(PRTFILE phFile, uint64_t fAccess)
+{
+    AssertReturn(   fAccess == RTFILE_O_READ
+                 || fAccess == RTFILE_O_WRITE
+                 || fAccess == RTFILE_O_READWRITE,
+                 VERR_INVALID_PARAMETER);
+    return RTFileOpen(phFile, "NUL", fAccess | RTFILE_O_DENY_NONE | RTFILE_O_OPEN);
+}
+
+
+RTR3DECL(int)  RTFileClose(RTFILE hFile)
+{
+    if (hFile == NIL_RTFILE)
+        return VINF_SUCCESS;
+    if (CloseHandle((HANDLE)RTFileToNative(hFile)))
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTFILE rtFileGetStandard(RTHANDLESTD enmStdHandle)
+{
+    DWORD dwStdHandle;
+    switch (enmStdHandle)
+    {
+        case RTHANDLESTD_INPUT:     dwStdHandle = STD_INPUT_HANDLE;  break;
+        case RTHANDLESTD_OUTPUT:    dwStdHandle = STD_OUTPUT_HANDLE; break;
+        case RTHANDLESTD_ERROR:     dwStdHandle = STD_ERROR_HANDLE;  break;
+        default:
+            AssertFailedReturn(NIL_RTFILE);
+    }
+
+    HANDLE hNative = GetStdHandle(dwStdHandle);
+    if (hNative == INVALID_HANDLE_VALUE)
+        return NIL_RTFILE;
+
+    RTFILE hFile = (RTFILE)(uintptr_t)hNative;
+    AssertReturn((HANDLE)(uintptr_t)hFile == hNative, NIL_RTFILE);
+    return hFile;
+}
+
+
+RTR3DECL(int)  RTFileSeek(RTFILE hFile, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
+{
+    static ULONG aulSeekRecode[] =
+    {
+        FILE_BEGIN,
+        FILE_CURRENT,
+        FILE_END,
+    };
+
+    /*
+     * Validate input.
+     */
+    if (uMethod > RTFILE_SEEK_END)
+    {
+        AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Execute the seek.
+     */
+    if (MySetFilePointer(hFile, offSeek, poffActual, aulSeekRecode[uMethod]))
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(int)  RTFileRead(RTFILE hFile, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    if (cbToRead <= 0)
+    {
+        if (pcbRead)
+            *pcbRead = 0;
+        return VINF_SUCCESS;
+    }
+    ULONG cbToReadAdj = (ULONG)cbToRead;
+    AssertReturn(cbToReadAdj == cbToRead, VERR_NUMBER_TOO_BIG);
+
+    ULONG cbRead = 0;
+    if (ReadFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToReadAdj, &cbRead, NULL))
+    {
+        if (pcbRead)
+            /* Caller can handle partial reads. */
+            *pcbRead = cbRead;
+        else
+        {
+            /* Caller expects everything to be read. */
+            while (cbToReadAdj > cbRead)
+            {
+                ULONG cbReadPart = 0;
+                if (!ReadFile((HANDLE)RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToReadAdj - cbRead, &cbReadPart, NULL))
+                    return RTErrConvertFromWin32(GetLastError());
+                if (cbReadPart == 0)
+                    return VERR_EOF;
+                cbRead += cbReadPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * If it's a console, we might bump into out of memory conditions in the
+     * ReadConsole call.
+     */
+    DWORD dwErr = GetLastError();
+    if (dwErr == ERROR_NOT_ENOUGH_MEMORY)
+    {
+        ULONG cbChunk = cbToReadAdj / 2;
+        if (cbChunk > 16*_1K)
+            cbChunk = 16*_1K;
+        else
+            cbChunk = RT_ALIGN_32(cbChunk, 256);
+
+        cbRead = 0;
+        while (cbToReadAdj > cbRead)
+        {
+            ULONG cbToRead   = RT_MIN(cbChunk, cbToReadAdj - cbRead);
+            ULONG cbReadPart = 0;
+            if (!ReadFile((HANDLE)RTFileToNative(hFile), (char *)pvBuf + cbRead, cbToRead, &cbReadPart, NULL))
+            {
+                /* If we failed because the buffer is too big, shrink it and
+                   try again. */
+                dwErr = GetLastError();
+                if (   dwErr == ERROR_NOT_ENOUGH_MEMORY
+                    && cbChunk > 8)
+                {
+                    cbChunk /= 2;
+                    continue;
+                }
+                return RTErrConvertFromWin32(dwErr);
+            }
+            cbRead += cbReadPart;
+
+            /* Return if the caller can handle partial reads, otherwise try
+               fill the buffer all the way up. */
+            if (pcbRead)
+            {
+                *pcbRead = cbRead;
+                break;
+            }
+            if (cbReadPart == 0)
+                return VERR_EOF;
+        }
+        return VINF_SUCCESS;
+    }
+
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTDECL(int)  RTFileReadAt(RTFILE hFile, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    ULONG cbToReadAdj = (ULONG)cbToRead;
+    AssertReturn(cbToReadAdj == cbToRead, VERR_NUMBER_TOO_BIG);
+
+    OVERLAPPED Overlapped;
+    Overlapped.Offset       = (uint32_t)off;
+    Overlapped.OffsetHigh   = (uint32_t)(off >> 32);
+    Overlapped.hEvent       = NULL;
+    Overlapped.Internal     = 0;
+    Overlapped.InternalHigh = 0;
+
+    ULONG cbRead = 0;
+    if (ReadFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToReadAdj, &cbRead, &Overlapped))
+    {
+        if (pcbRead)
+            /* Caller can handle partial reads. */
+            *pcbRead = cbRead;
+        else
+        {
+            /* Caller expects everything to be read. */
+            while (cbToReadAdj > cbRead)
+            {
+                Overlapped.Offset       = (uint32_t)(off + cbRead);
+                Overlapped.OffsetHigh   = (uint32_t)((off + cbRead) >> 32);
+                Overlapped.hEvent       = NULL;
+                Overlapped.Internal     = 0;
+                Overlapped.InternalHigh = 0;
+
+                ULONG cbReadPart = 0;
+                if (!ReadFile((HANDLE)RTFileToNative(hFile), (char *)pvBuf + cbRead, cbToReadAdj - cbRead,
+                              &cbReadPart, &Overlapped))
+                    return RTErrConvertFromWin32(GetLastError());
+                if (cbReadPart == 0)
+                    return VERR_EOF;
+                cbRead += cbReadPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    /* We will get an EOF error when using overlapped I/O.  So, make sure we don't
+       return it when pcbhRead is not NULL. */
+    DWORD dwErr = GetLastError();
+    if (pcbRead && dwErr == ERROR_HANDLE_EOF)
+    {
+        *pcbRead = 0;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTR3DECL(int)  RTFileWrite(RTFILE hFile, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    if (cbToWrite <= 0)
+        return VINF_SUCCESS;
+    ULONG const cbToWriteAdj = (ULONG)cbToWrite;
+    AssertReturn(cbToWriteAdj == cbToWrite, VERR_NUMBER_TOO_BIG);
+
+    ULONG cbWritten = 0;
+    if (WriteFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToWriteAdj, &cbWritten, NULL))
+    {
+        if (pcbWritten)
+            /* Caller can handle partial writes. */
+            *pcbWritten = RT_MIN(cbWritten, cbToWriteAdj); /* paranoia^3 */
+        else
+        {
+            /* Caller expects everything to be written. */
+            while (cbWritten < cbToWriteAdj)
+            {
+                ULONG cbWrittenPart = 0;
+                if (!WriteFile((HANDLE)RTFileToNative(hFile), (char*)pvBuf + cbWritten,
+                               cbToWriteAdj - cbWritten, &cbWrittenPart, NULL))
+                {
+                    int rc = RTErrConvertFromWin32(GetLastError());
+                    if (rc == VERR_DISK_FULL)
+                        rc = rtFileWinCheckIfDiskReallyFull(hFile, RTFileTell(hFile) + cbToWriteAdj - cbWritten);
+                    return rc;
+                }
+                if (cbWrittenPart == 0)
+                    return VERR_WRITE_ERROR;
+                cbWritten += cbWrittenPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * If it's a console, we might bump into out of memory conditions in the
+     * WriteConsole call.
+     */
+    DWORD dwErr = GetLastError();
+    if (dwErr == ERROR_NOT_ENOUGH_MEMORY)
+    {
+        ULONG cbChunk = cbToWriteAdj / 2;
+        if (cbChunk > _32K)
+            cbChunk = _32K;
+        else
+            cbChunk = RT_ALIGN_32(cbChunk, 256);
+
+        cbWritten = 0;
+        while (cbWritten < cbToWriteAdj)
+        {
+            ULONG cbToWrite     = RT_MIN(cbChunk, cbToWriteAdj - cbWritten);
+            ULONG cbWrittenPart = 0;
+            if (!WriteFile((HANDLE)RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite, &cbWrittenPart, NULL))
+            {
+                /* If we failed because the buffer is too big, shrink it and
+                   try again. */
+                dwErr = GetLastError();
+                if (   dwErr == ERROR_NOT_ENOUGH_MEMORY
+                    && cbChunk > 8)
+                {
+                    cbChunk /= 2;
+                    continue;
+                }
+                int rc = RTErrConvertFromWin32(dwErr);
+                if (rc == VERR_DISK_FULL)
+                    rc = rtFileWinCheckIfDiskReallyFull(hFile, RTFileTell(hFile) + cbToWrite);
+                return rc;
+            }
+            cbWritten += cbWrittenPart;
+
+            /* Return if the caller can handle partial writes, otherwise try
+               write out everything. */
+            if (pcbWritten)
+            {
+                *pcbWritten = RT_MIN(cbWritten, cbToWriteAdj); /* paranoia^3 */
+                break;
+            }
+            if (cbWrittenPart == 0)
+                return VERR_WRITE_ERROR;
+        }
+        return VINF_SUCCESS;
+    }
+
+    int rc = RTErrConvertFromWin32(dwErr);
+    if (rc == VERR_DISK_FULL)
+        rc = rtFileWinCheckIfDiskReallyFull(hFile, RTFileTell(hFile) + cbToWriteAdj);
+    return rc;
+}
+
+
+RTDECL(int)  RTFileWriteAt(RTFILE hFile, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    ULONG const cbToWriteAdj = (ULONG)cbToWrite;
+    AssertReturn(cbToWriteAdj == cbToWrite, VERR_NUMBER_TOO_BIG);
+
+    OVERLAPPED Overlapped;
+    Overlapped.Offset       = (uint32_t)off;
+    Overlapped.OffsetHigh   = (uint32_t)(off >> 32);
+    Overlapped.hEvent       = NULL;
+    Overlapped.Internal     = 0;
+    Overlapped.InternalHigh = 0;
+
+    ULONG cbWritten = 0;
+    if (WriteFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToWriteAdj, &cbWritten, &Overlapped))
+    {
+        if (pcbWritten)
+            /* Caller can handle partial writes. */
+            *pcbWritten = RT_MIN(cbWritten, cbToWriteAdj); /* paranoia^3 */
+        else
+        {
+            /* Caller expects everything to be written. */
+            while (cbWritten < cbToWriteAdj)
+            {
+                Overlapped.Offset       = (uint32_t)(off + cbWritten);
+                Overlapped.OffsetHigh   = (uint32_t)((off + cbWritten) >> 32);
+                Overlapped.hEvent       = NULL;
+                Overlapped.Internal     = 0;
+                Overlapped.InternalHigh = 0;
+
+                ULONG cbWrittenPart = 0;
+                if (!WriteFile((HANDLE)RTFileToNative(hFile), (char*)pvBuf + cbWritten,
+                               cbToWriteAdj - cbWritten, &cbWrittenPart, &Overlapped))
+                {
+                    int rc = RTErrConvertFromWin32(GetLastError());
+                    if (rc == VERR_DISK_FULL)
+                        rc = rtFileWinCheckIfDiskReallyFull(hFile, off + cbToWriteAdj);
+                    return rc;
+                }
+                if (cbWrittenPart == 0)
+                    return VERR_WRITE_ERROR;
+                cbWritten += cbWrittenPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    int rc = RTErrConvertFromWin32(GetLastError());
+    if (rc == VERR_DISK_FULL)
+        rc = rtFileWinCheckIfDiskReallyFull(hFile, off + cbToWriteAdj);
+    return rc;
+}
+
+
+RTR3DECL(int)  RTFileFlush(RTFILE hFile)
+{
+    if (!FlushFileBuffers((HANDLE)RTFileToNative(hFile)))
+    {
+        int rc = GetLastError();
+        Log(("FlushFileBuffers failed with %d\n", rc));
+        return RTErrConvertFromWin32(rc);
+    }
+    return VINF_SUCCESS;
+}
+
+#if 1
+
+/**
+ * Checks the the two handles refers to the same file.
+ *
+ * @returns true if the same file, false if different ones or invalid handles.
+ * @param   hFile1              Handle \#1.
+ * @param   hFile2              Handle \#2.
+ */
+static bool rtFileIsSame(HANDLE hFile1, HANDLE hFile2)
+{
+    /*
+     * We retry in case CreationTime or the Object ID is being modified and there
+     * aren't any IndexNumber (file ID) on this kind of file system.
+     */
+    for (uint32_t iTries = 0; iTries < 3; iTries++)
+    {
+        /*
+         * Fetch data to compare (being a little lazy here).
+         */
+        struct
+        {
+            HANDLE                      hFile;
+            NTSTATUS                    rcObjId;
+            FILE_OBJECTID_INFORMATION   ObjId;
+            FILE_ALL_INFORMATION        All;
+            FILE_FS_VOLUME_INFORMATION  Vol;
+        } auData[2];
+        auData[0].hFile = hFile1;
+        auData[1].hFile = hFile2;
+
+        for (uintptr_t i = 0; i < RT_ELEMENTS(auData); i++)
+        {
+            RT_ZERO(auData[i].ObjId);
+            IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+            auData[i].rcObjId = NtQueryInformationFile(auData[i].hFile, &Ios, &auData[i].ObjId, sizeof(auData[i].ObjId),
+                                                       FileObjectIdInformation);
+
+            RT_ZERO(auData[i].All);
+            RTNT_IO_STATUS_BLOCK_REINIT(&Ios);
+            NTSTATUS rcNt = NtQueryInformationFile(auData[i].hFile, &Ios, &auData[i].All, sizeof(auData[i].All),
+                                                   FileAllInformation);
+            AssertReturn(rcNt == STATUS_BUFFER_OVERFLOW /* insufficient space for name info */ || NT_SUCCESS(rcNt), false);
+
+            union
+            {
+                 FILE_FS_VOLUME_INFORMATION Info;
+                 uint8_t                    abBuf[sizeof(FILE_FS_VOLUME_INFORMATION) + 4096];
+            } uVol;
+            RT_ZERO(uVol.Info);
+            RTNT_IO_STATUS_BLOCK_REINIT(&Ios);
+            rcNt = NtQueryVolumeInformationFile(auData[i].hFile, &Ios, &uVol, sizeof(uVol), FileFsVolumeInformation);
+            if (NT_SUCCESS(rcNt))
+                auData[i].Vol = uVol.Info;
+            else
+                RT_ZERO(auData[i].Vol);
+        }
+
+        /*
+         * Compare it.
+         */
+        if (   auData[0].All.StandardInformation.Directory
+            == auData[1].All.StandardInformation.Directory)
+        { /* likely */ }
+        else
+            break;
+
+        if (   (auData[0].All.BasicInformation.FileAttributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE | FILE_ATTRIBUTE_REPARSE_POINT))
+            == (auData[1].All.BasicInformation.FileAttributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE | FILE_ATTRIBUTE_REPARSE_POINT)))
+        { /* likely */ }
+        else
+            break;
+
+        if (   auData[0].Vol.VolumeSerialNumber
+            == auData[1].Vol.VolumeSerialNumber)
+        { /* likely */ }
+        else
+            break;
+
+        if (   auData[0].All.InternalInformation.IndexNumber.QuadPart
+            == auData[1].All.InternalInformation.IndexNumber.QuadPart)
+        { /* likely */ }
+        else
+            break;
+
+        if (   !NT_SUCCESS(auData[0].rcObjId)
+            || memcmp(&auData[0].ObjId, &auData[1].ObjId, RT_UOFFSETOF(FILE_OBJECTID_INFORMATION, ExtendedInfo)) == 0)
+        {
+            if (   auData[0].All.BasicInformation.CreationTime.QuadPart
+                == auData[1].All.BasicInformation.CreationTime.QuadPart)
+                return true;
+        }
+    }
+
+    return false;
+}
+
+
+/**
+ * If @a hFile is opened in append mode, try return a handle with
+ * FILE_WRITE_DATA permissions.
+ *
+ * @returns Duplicate handle.
+ * @param   hFile               The NT handle to check & duplicate.
+ *
+ * @todo    It would be much easier to implement this by not dropping the
+ *          FILE_WRITE_DATA access and instead have the RTFileWrite APIs
+ *          enforce the appending.  That will require keeping additional
+ *          information along side the handle (instance structure).  However, on
+ *          windows you can grant append permissions w/o giving people access to
+ *          overwrite existing data, so the RTFileOpenEx code would have to deal
+ *          with those kinds of STATUS_ACCESS_DENIED too then.
+ */
+static HANDLE rtFileReOpenAppendOnlyWithFullWriteAccess(HANDLE hFile)
+{
+    OBJECT_BASIC_INFORMATION BasicInfo = {0};
+    ULONG                    cbActual  = 0;
+    NTSTATUS rcNt = NtQueryObject(hFile, ObjectBasicInformation, &BasicInfo, sizeof(BasicInfo), &cbActual);
+    if (NT_SUCCESS(rcNt))
+    {
+        if ((BasicInfo.GrantedAccess & (FILE_APPEND_DATA | FILE_WRITE_DATA)) == FILE_APPEND_DATA)
+        {
+            /*
+             * We cannot use NtDuplicateObject here as it is not possible to
+             * upgrade the access on files, only making it more strict.  So,
+             * query the path and re-open it (we could do by file/object/whatever
+             * id too, but that may not work with all file systems).
+             */
+            for (uint32_t i = 0; i < 16; i++)
+            {
+                UNICODE_STRING  NtName;
+                int rc = RTNtPathFromHandle(&NtName, hFile, 0);
+                AssertRCReturn(rc, INVALID_HANDLE_VALUE);
+
+                HANDLE              hDupFile = RTNT_INVALID_HANDLE_VALUE;
+                IO_STATUS_BLOCK     Ios      = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+                OBJECT_ATTRIBUTES   ObjAttr;
+                InitializeObjectAttributes(&ObjAttr, &NtName, BasicInfo.Attributes & ~OBJ_INHERIT, NULL, NULL);
+
+                NTSTATUS rcNt = NtCreateFile(&hDupFile,
+                                             BasicInfo.GrantedAccess | FILE_WRITE_DATA,
+                                             &ObjAttr,
+                                             &Ios,
+                                             NULL /* AllocationSize*/,
+                                             FILE_ATTRIBUTE_NORMAL,
+                                             FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                                             FILE_OPEN,
+                                             FILE_OPEN_FOR_BACKUP_INTENT /*??*/,
+                                             NULL /*EaBuffer*/,
+                                             0 /*EaLength*/);
+                RTUtf16Free(NtName.Buffer);
+                if (NT_SUCCESS(rcNt))
+                {
+                    /*
+                     * Check that we've opened the same file.
+                     */
+                    if (rtFileIsSame(hFile, hDupFile))
+                        return hDupFile;
+                    NtClose(hDupFile);
+                }
+            }
+            AssertFailed();
+        }
+    }
+    return INVALID_HANDLE_VALUE;
+}
+
+#endif
+
+RTR3DECL(int) RTFileSetSize(RTFILE hFile, uint64_t cbSize)
+{
+#if 1
+    HANDLE hNtFile  = (HANDLE)RTFileToNative(hFile);
+    HANDLE hDupFile = INVALID_HANDLE_VALUE;
+    union
+    {
+        FILE_END_OF_FILE_INFORMATION Eof;
+        FILE_ALLOCATION_INFORMATION  Alloc;
+    } uInfo;
+
+    /*
+     * Change the EOF marker.
+     *
+     * HACK ALERT! If the file was opened in RTFILE_O_APPEND mode, we will have
+     *             to re-open it with FILE_WRITE_DATA access to get the job done.
+     *             This how ftruncate on a unixy system would work but not how
+     *             it is done on Windows where appending is a separate permission
+     *             rather than just a write modifier, making this hack totally wrong.
+     */
+    /** @todo The right way to fix this is either to add a RTFileSetSizeEx function
+     *        for specifically requesting the unixy behaviour, or add an additional
+     *        flag to RTFileOpen[Ex] to request the unixy append behaviour there.
+     *        The latter would require saving the open flags in a instance data
+     *        structure, which is a bit of a risky move, though something we should
+     *        do in 6.2 (or later).
+     *
+     *        Note! Because handle interitance, it is not realyan option to
+     *              always use FILE_WRITE_DATA and implement the RTFILE_O_APPEND
+     *              bits in RTFileWrite and friends.  Besides, it's not like
+     *              RTFILE_O_APPEND is so clearly defined anyway - see
+     *              RTFileWriteAt.
+     */
+    IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+    uInfo.Eof.EndOfFile.QuadPart = cbSize;
+    NTSTATUS rcNt = NtSetInformationFile(hNtFile, &Ios, &uInfo.Eof, sizeof(uInfo.Eof), FileEndOfFileInformation);
+    if (rcNt == STATUS_ACCESS_DENIED)
+    {
+        hDupFile = rtFileReOpenAppendOnlyWithFullWriteAccess(hNtFile);
+        if (hDupFile != INVALID_HANDLE_VALUE)
+        {
+            hNtFile = hDupFile;
+            uInfo.Eof.EndOfFile.QuadPart = cbSize;
+            rcNt = NtSetInformationFile(hNtFile, &Ios, &uInfo.Eof, sizeof(uInfo.Eof), FileEndOfFileInformation);
+        }
+    }
+
+    if (NT_SUCCESS(rcNt))
+    {
+        /*
+         * Change the allocation.
+         */
+        uInfo.Alloc.AllocationSize.QuadPart = cbSize;
+        rcNt = NtSetInformationFile(hNtFile, &Ios, &uInfo.Eof, sizeof(uInfo.Alloc), FileAllocationInformation);
+    }
+
+    /*
+     * Close the temporary file handle:
+     */
+    if (hDupFile != INVALID_HANDLE_VALUE)
+        NtClose(hDupFile);
+
+    if (RT_SUCCESS(rcNt))
+        return VINF_SUCCESS;
+    return RTErrConvertFromNtStatus(rcNt);
+
+#else /* this version of the code will fail to truncate files when RTFILE_O_APPEND is in effect, which isn't what we want... */
+    /*
+     * Get current file pointer.
+     */
+    int         rc;
+    uint64_t    offCurrent;
+    if (MySetFilePointer(hFile, 0, &offCurrent, FILE_CURRENT))
+    {
+        /*
+         * Set new file pointer.
+         */
+        if (MySetFilePointer(hFile, cbSize, NULL, FILE_BEGIN))
+        {
+            /* set file pointer */
+            if (SetEndOfFile((HANDLE)RTFileToNative(hFile)))
+            {
+                /*
+                 * Restore file pointer and return.
+                 * If the old pointer was beyond the new file end, ignore failure.
+                 */
+                if (    MySetFilePointer(hFile, offCurrent, NULL, FILE_BEGIN)
+                    ||  offCurrent > cbSize)
+                    return VINF_SUCCESS;
+            }
+
+            /*
+             * Failed, try restoring the file pointer.
+             */
+            rc = GetLastError();
+            MySetFilePointer(hFile, offCurrent, NULL, FILE_BEGIN);
+
+            if (rc == ERROR_DISK_FULL)
+                return rtFileWinCheckIfDiskReallyFull(hFile, cbSize);
+        }
+        else
+            rc = GetLastError();
+    }
+    else
+        rc = GetLastError();
+
+    return RTErrConvertFromWin32(rc);
+#endif
+}
+
+
+RTR3DECL(int)  RTFileQuerySize(RTFILE hFile, uint64_t *pcbSize)
+{
+    /*
+     * GetFileSize works for most handles.
+     */
+    ULARGE_INTEGER  Size;
+    Size.LowPart = GetFileSize((HANDLE)RTFileToNative(hFile), &Size.HighPart);
+    if (Size.LowPart != INVALID_FILE_SIZE)
+    {
+        *pcbSize = Size.QuadPart;
+        return VINF_SUCCESS;
+    }
+    int rc = RTErrConvertFromWin32(GetLastError());
+
+    /*
+     * Could it be a volume or a disk?
+     */
+    DISK_GEOMETRY   DriveGeo;
+    DWORD           cbDriveGeo;
+    if (DeviceIoControl((HANDLE)RTFileToNative(hFile),
+                        IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
+                        &DriveGeo, sizeof(DriveGeo), &cbDriveGeo, NULL))
+    {
+        if (   DriveGeo.MediaType == FixedMedia
+            || DriveGeo.MediaType == RemovableMedia)
+        {
+            *pcbSize = DriveGeo.Cylinders.QuadPart
+                     * DriveGeo.TracksPerCylinder
+                     * DriveGeo.SectorsPerTrack
+                     * DriveGeo.BytesPerSector;
+
+            GET_LENGTH_INFORMATION  DiskLenInfo;
+            DWORD                   Ignored;
+            if (DeviceIoControl((HANDLE)RTFileToNative(hFile),
+                                IOCTL_DISK_GET_LENGTH_INFO, NULL, 0,
+                                &DiskLenInfo, sizeof(DiskLenInfo), &Ignored, (LPOVERLAPPED)NULL))
+            {
+                /* IOCTL_DISK_GET_LENGTH_INFO is supported -- override cbSize. */
+                *pcbSize = DiskLenInfo.Length.QuadPart;
+            }
+            return VINF_SUCCESS;
+        }
+    }
+
+    /*
+     * Return the GetFileSize result if not a volume/disk.
+     */
+    return rc;
+}
+
+
+RTR3DECL(int) RTFileQueryMaxSizeEx(RTFILE hFile, PRTFOFF pcbMax)
+{
+    /** @todo r=bird:
+     * We might have to make this code OS version specific... In the worse
+     * case, we'll have to try GetVolumeInformationByHandle on vista and fall
+     * back on NtQueryVolumeInformationFile(,,,, FileFsAttributeInformation)
+     * else where, and check for known file system names. (For LAN shares we'll
+     * have to figure out the remote file system.) */
+    RT_NOREF_PV(hFile); RT_NOREF_PV(pcbMax);
+    return VERR_NOT_IMPLEMENTED;
+}
+
+
+RTR3DECL(bool) RTFileIsValid(RTFILE hFile)
+{
+    if (hFile != NIL_RTFILE)
+    {
+        DWORD dwType = GetFileType((HANDLE)RTFileToNative(hFile));
+        switch (dwType)
+        {
+            case FILE_TYPE_CHAR:
+            case FILE_TYPE_DISK:
+            case FILE_TYPE_PIPE:
+            case FILE_TYPE_REMOTE:
+                return true;
+
+            case FILE_TYPE_UNKNOWN:
+                if (GetLastError() == NO_ERROR)
+                    return true;
+                break;
+
+            default:
+                break;
+        }
+    }
+    return false;
+}
+
+
+#define LOW_DWORD(u64) ((DWORD)u64)
+#define HIGH_DWORD(u64) (((DWORD *)&u64)[1])
+
+RTR3DECL(int)  RTFileLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    /* Check arguments. */
+    if (fLock & ~RTFILE_LOCK_MASK)
+    {
+        AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /* Prepare flags. */
+    Assert(RTFILE_LOCK_WRITE);
+    DWORD dwFlags = (fLock & RTFILE_LOCK_WRITE) ? LOCKFILE_EXCLUSIVE_LOCK : 0;
+    Assert(RTFILE_LOCK_WAIT);
+    if (!(fLock & RTFILE_LOCK_WAIT))
+        dwFlags |= LOCKFILE_FAIL_IMMEDIATELY;
+
+    /* Windows structure. */
+    OVERLAPPED Overlapped;
+    memset(&Overlapped, 0, sizeof(Overlapped));
+    Overlapped.Offset = LOW_DWORD(offLock);
+    Overlapped.OffsetHigh = HIGH_DWORD(offLock);
+
+    /* Note: according to Microsoft, LockFileEx API call is available starting from NT 3.5 */
+    if (LockFileEx((HANDLE)RTFileToNative(hFile), dwFlags, 0, LOW_DWORD(cbLock), HIGH_DWORD(cbLock), &Overlapped))
+        return VINF_SUCCESS;
+
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(int)  RTFileChangeLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    /* Check arguments. */
+    if (fLock & ~RTFILE_LOCK_MASK)
+    {
+        AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /* Remove old lock. */
+    int rc = RTFileUnlock(hFile, offLock, cbLock);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /* Set new lock. */
+    rc = RTFileLock(hFile, fLock, offLock, cbLock);
+    if (RT_SUCCESS(rc))
+        return rc;
+
+    /* Try to restore old lock. */
+    unsigned fLockOld = (fLock & RTFILE_LOCK_WRITE) ? fLock & ~RTFILE_LOCK_WRITE : fLock | RTFILE_LOCK_WRITE;
+    rc = RTFileLock(hFile, fLockOld, offLock, cbLock);
+    if (RT_SUCCESS(rc))
+        return VERR_FILE_LOCK_VIOLATION;
+    else
+        return VERR_FILE_LOCK_LOST;
+}
+
+
+RTR3DECL(int)  RTFileUnlock(RTFILE hFile, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    if (UnlockFile((HANDLE)RTFileToNative(hFile),
+                   LOW_DWORD(offLock), HIGH_DWORD(offLock),
+                   LOW_DWORD(cbLock), HIGH_DWORD(cbLock)))
+        return VINF_SUCCESS;
+
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+
+RTR3DECL(int) RTFileQueryInfo(RTFILE hFile, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs)
+{
+    /*
+     * Validate input.
+     */
+    if (hFile == NIL_RTFILE)
+    {
+        AssertMsgFailed(("Invalid hFile=%RTfile\n", hFile));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (!pObjInfo)
+    {
+        AssertMsgFailed(("Invalid pObjInfo=%p\n", pObjInfo));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (    enmAdditionalAttribs < RTFSOBJATTRADD_NOTHING
+        ||  enmAdditionalAttribs > RTFSOBJATTRADD_LAST)
+    {
+        AssertMsgFailed(("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Query file info.
+     */
+    HANDLE hHandle = (HANDLE)RTFileToNative(hFile);
+#if 1
+    uint64_t auBuf[168 / sizeof(uint64_t)]; /* Missing FILE_ALL_INFORMATION here. */
+    int rc = rtPathNtQueryInfoFromHandle(hFile, auBuf, sizeof(auBuf), pObjInfo, enmAdditionalAttribs, NULL, 0);
+    if (RT_SUCCESS(rc))
+        return rc;
+
+    /*
+     * Console I/O handles make trouble here.  On older windows versions they
+     * end up with ERROR_INVALID_HANDLE when handed to the above API, while on
+     * more recent ones they cause different errors to appear.
+     *
+     * Thus, we must ignore the latter and doubly verify invalid handle claims.
+     * We use the undocumented VerifyConsoleIoHandle to do this, falling back on
+     * GetFileType should it not be there.
+     */
+    if (   rc == VERR_INVALID_HANDLE
+        || rc == VERR_ACCESS_DENIED
+        || rc == VERR_UNEXPECTED_FS_OBJ_TYPE)
+    {
+        static PFNVERIFYCONSOLEIOHANDLE s_pfnVerifyConsoleIoHandle = NULL;
+        static bool volatile            s_fInitialized = false;
+        PFNVERIFYCONSOLEIOHANDLE        pfnVerifyConsoleIoHandle;
+        if (s_fInitialized)
+            pfnVerifyConsoleIoHandle = s_pfnVerifyConsoleIoHandle;
+        else
+        {
+            pfnVerifyConsoleIoHandle = (PFNVERIFYCONSOLEIOHANDLE)RTLdrGetSystemSymbol("kernel32.dll", "VerifyConsoleIoHandle");
+            ASMAtomicWriteBool(&s_fInitialized, true);
+        }
+        if (   pfnVerifyConsoleIoHandle
+            ? !pfnVerifyConsoleIoHandle(hHandle)
+            : GetFileType(hHandle) == FILE_TYPE_UNKNOWN && GetLastError() != NO_ERROR)
+            return VERR_INVALID_HANDLE;
+    }
+    /*
+     * On Windows 10 and (hopefully) 8.1 we get ERROR_INVALID_FUNCTION with console
+     * I/O handles and null device handles.  We must ignore these just like the
+     * above invalid handle error.
+     */
+    else if (rc != VERR_INVALID_FUNCTION && rc != VERR_IO_BAD_COMMAND)
+        return rc;
+
+    RT_ZERO(*pObjInfo);
+    pObjInfo->Attr.enmAdditional = enmAdditionalAttribs;
+    pObjInfo->Attr.fMode = rtFsModeFromDos(RTFS_DOS_NT_DEVICE, "", 0, 0, 0);
+    return VINF_SUCCESS;
+#else
+
+    BY_HANDLE_FILE_INFORMATION Data;
+    if (!GetFileInformationByHandle(hHandle, &Data))
+    {
+        /*
+         * Console I/O handles make trouble here.  On older windows versions they
+         * end up with ERROR_INVALID_HANDLE when handed to the above API, while on
+         * more recent ones they cause different errors to appear.
+         *
+         * Thus, we must ignore the latter and doubly verify invalid handle claims.
+         * We use the undocumented VerifyConsoleIoHandle to do this, falling back on
+         * GetFileType should it not be there.
+         */
+        DWORD dwErr = GetLastError();
+        if (dwErr == ERROR_INVALID_HANDLE)
+        {
+            static PFNVERIFYCONSOLEIOHANDLE s_pfnVerifyConsoleIoHandle = NULL;
+            static bool volatile            s_fInitialized = false;
+            PFNVERIFYCONSOLEIOHANDLE        pfnVerifyConsoleIoHandle;
+            if (s_fInitialized)
+                pfnVerifyConsoleIoHandle = s_pfnVerifyConsoleIoHandle;
+            else
+            {
+                pfnVerifyConsoleIoHandle = (PFNVERIFYCONSOLEIOHANDLE)RTLdrGetSystemSymbol("kernel32.dll", "VerifyConsoleIoHandle");
+                ASMAtomicWriteBool(&s_fInitialized, true);
+            }
+            if (   pfnVerifyConsoleIoHandle
+                ? !pfnVerifyConsoleIoHandle(hHandle)
+                : GetFileType(hHandle) == FILE_TYPE_UNKNOWN && GetLastError() != NO_ERROR)
+                return VERR_INVALID_HANDLE;
+        }
+        /*
+         * On Windows 10 and (hopefully) 8.1 we get ERROR_INVALID_FUNCTION with console I/O
+         * handles.  We must ignore these just like the above invalid handle error.
+         */
+        else if (dwErr != ERROR_INVALID_FUNCTION)
+            return RTErrConvertFromWin32(dwErr);
+
+        RT_ZERO(Data);
+        Data.dwFileAttributes = RTFS_DOS_NT_DEVICE;
+    }
+
+    /*
+     * Setup the returned data.
+     */
+    pObjInfo->cbObject    = ((uint64_t)Data.nFileSizeHigh << 32)
+                          |  (uint64_t)Data.nFileSizeLow;
+    pObjInfo->cbAllocated = pObjInfo->cbObject;
+
+    Assert(sizeof(uint64_t) == sizeof(Data.ftCreationTime));
+    RTTimeSpecSetNtTime(&pObjInfo->BirthTime,         *(uint64_t *)&Data.ftCreationTime);
+    RTTimeSpecSetNtTime(&pObjInfo->AccessTime,        *(uint64_t *)&Data.ftLastAccessTime);
+    RTTimeSpecSetNtTime(&pObjInfo->ModificationTime,  *(uint64_t *)&Data.ftLastWriteTime);
+    pObjInfo->ChangeTime  = pObjInfo->ModificationTime;
+
+    pObjInfo->Attr.fMode  = rtFsModeFromDos((Data.dwFileAttributes << RTFS_DOS_SHIFT) & RTFS_DOS_MASK_NT, "", 0,
+                                            RTFSMODE_SYMLINK_REPARSE_TAG /* (symlink or not, doesn't usually matter here) */);
+
+    /*
+     * Requested attributes (we cannot provide anything actually).
+     */
+    switch (enmAdditionalAttribs)
+    {
+        case RTFSOBJATTRADD_NOTHING:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_NOTHING;
+            break;
+
+        case RTFSOBJATTRADD_UNIX:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX;
+            pObjInfo->Attr.u.Unix.uid             = ~0U;
+            pObjInfo->Attr.u.Unix.gid             = ~0U;
+            pObjInfo->Attr.u.Unix.cHardlinks      = Data.nNumberOfLinks ? Data.nNumberOfLinks : 1;
+            pObjInfo->Attr.u.Unix.INodeIdDevice   = Data.dwVolumeSerialNumber;
+            pObjInfo->Attr.u.Unix.INodeId         = RT_MAKE_U64(Data.nFileIndexLow, Data.nFileIndexHigh);
+            pObjInfo->Attr.u.Unix.fFlags          = 0;
+            pObjInfo->Attr.u.Unix.GenerationId    = 0;
+            pObjInfo->Attr.u.Unix.Device          = 0;
+            break;
+
+        case RTFSOBJATTRADD_UNIX_OWNER:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_OWNER;
+            pObjInfo->Attr.u.UnixOwner.uid        = ~0U;
+            pObjInfo->Attr.u.UnixOwner.szName[0]  = '\0'; /** @todo return something sensible here. */
+            break;
+
+        case RTFSOBJATTRADD_UNIX_GROUP:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_GROUP;
+            pObjInfo->Attr.u.UnixGroup.gid        = ~0U;
+            pObjInfo->Attr.u.UnixGroup.szName[0]  = '\0';
+            break;
+
+        case RTFSOBJATTRADD_EASIZE:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_EASIZE;
+            pObjInfo->Attr.u.EASize.cb            = 0;
+            break;
+
+        default:
+            AssertMsgFailed(("Impossible!\n"));
+            return VERR_INTERNAL_ERROR;
+    }
+
+    return VINF_SUCCESS;
+#endif
+}
+
+
+RTR3DECL(int) RTFileSetTimes(RTFILE hFile, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
+                             PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
+{
+    RT_NOREF_PV(pChangeTime); /* Not exposed thru the windows API we're using. */
+
+    if (!pAccessTime && !pModificationTime && !pBirthTime)
+        return VINF_SUCCESS;    /* NOP */
+
+    FILETIME    CreationTimeFT;
+    PFILETIME   pCreationTimeFT = NULL;
+    if (pBirthTime)
+        pCreationTimeFT = RTTimeSpecGetNtFileTime(pBirthTime, &CreationTimeFT);
+
+    FILETIME    LastAccessTimeFT;
+    PFILETIME   pLastAccessTimeFT = NULL;
+    if (pAccessTime)
+        pLastAccessTimeFT = RTTimeSpecGetNtFileTime(pAccessTime, &LastAccessTimeFT);
+
+    FILETIME    LastWriteTimeFT;
+    PFILETIME   pLastWriteTimeFT = NULL;
+    if (pModificationTime)
+        pLastWriteTimeFT = RTTimeSpecGetNtFileTime(pModificationTime, &LastWriteTimeFT);
+
+    int rc = VINF_SUCCESS;
+    if (!SetFileTime((HANDLE)RTFileToNative(hFile), pCreationTimeFT, pLastAccessTimeFT, pLastWriteTimeFT))
+    {
+        DWORD Err = GetLastError();
+        rc = RTErrConvertFromWin32(Err);
+        Log(("RTFileSetTimes(%RTfile, %p, %p, %p, %p): SetFileTime failed with lasterr %d (%Rrc)\n",
+             hFile, pAccessTime, pModificationTime, pChangeTime, pBirthTime, Err, rc));
+    }
+    return rc;
+}
+
+
+#if 0 /* RTFileSetMode is implemented by RTFileSetMode-r3-nt.cpp */
+/* This comes from a source file with a different set of system headers (DDK)
+ * so it can't be declared in a common header, like internal/file.h.
+ */
+extern int rtFileNativeSetAttributes(HANDLE FileHandle, ULONG FileAttributes);
+
+
+RTR3DECL(int) RTFileSetMode(RTFILE hFile, RTFMODE fMode)
+{
+    /*
+     * Normalize the mode and call the API.
+     */
+    fMode = rtFsModeNormalize(fMode, NULL, 0);
+    if (!rtFsModeIsValid(fMode))
+        return VERR_INVALID_PARAMETER;
+
+    ULONG FileAttributes = (fMode & RTFS_DOS_MASK) >> RTFS_DOS_SHIFT;
+    int Err = rtFileNativeSetAttributes((HANDLE)hFile, FileAttributes);
+    if (Err != ERROR_SUCCESS)
+    {
+        int rc = RTErrConvertFromWin32(Err);
+        Log(("RTFileSetMode(%RTfile, %RTfmode): rtFileNativeSetAttributes (0x%08X) failed with err %d (%Rrc)\n",
+             hFile, fMode, FileAttributes, Err, rc));
+        return rc;
+    }
+    return VINF_SUCCESS;
+}
+#endif
+
+
+/* RTFileQueryFsSizes is implemented by ../nt/RTFileQueryFsSizes-nt.cpp */
+
+
+RTR3DECL(int)  RTFileDelete(const char *pszFilename)
+{
+    PRTUTF16 pwszFilename;
+    int rc = RTPathWinFromUtf8(&pwszFilename, pszFilename, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        if (!DeleteFileW(pwszFilename))
+            rc = RTErrConvertFromWin32(GetLastError());
+        RTPathWinFree(pwszFilename);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTFileRename(const char *pszSrc, const char *pszDst, unsigned fRename)
+{
+    /*
+     * Validate input.
+     */
+    AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
+    AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
+    AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
+
+    /*
+     * Hand it on to the worker.
+     */
+    int rc = rtPathWin32MoveRename(pszSrc, pszDst,
+                                   fRename & RTPATHRENAME_FLAGS_REPLACE ? MOVEFILE_REPLACE_EXISTING : 0,
+                                   RTFS_TYPE_FILE);
+
+    LogFlow(("RTFileMove(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
+             pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
+    return rc;
+
+}
+
+
+RTDECL(int) RTFileMove(const char *pszSrc, const char *pszDst, unsigned fMove)
+{
+    /*
+     * Validate input.
+     */
+    AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
+    AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
+    AssertMsgReturn(!(fMove & ~RTFILEMOVE_FLAGS_REPLACE), ("%#x\n", fMove), VERR_INVALID_PARAMETER);
+
+    /*
+     * Hand it on to the worker.
+     */
+    int rc = rtPathWin32MoveRename(pszSrc, pszDst,
+                                   fMove & RTFILEMOVE_FLAGS_REPLACE
+                                   ? MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING
+                                   : MOVEFILE_COPY_ALLOWED,
+                                   RTFS_TYPE_FILE);
+
+    LogFlow(("RTFileMove(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
+             pszSrc, pszSrc, pszDst, pszDst, fMove, rc));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/fs-win.cpp b/src/VBox/Runtime/r3/win/fs-win.cpp
new file mode 100644
index 00000000..c780b4d5
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/fs-win.cpp
@@ -0,0 +1,427 @@
+/* $Id: fs-win.cpp $ */
+/** @file
+ * IPRT - File System, Win32.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_FS
+#include <iprt/win/windows.h>
+
+#include <iprt/fs.h>
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/param.h>
+#include <iprt/err.h>
+#include <iprt/log.h>
+#include <iprt/assert.h>
+#include "internal/fs.h"
+
+/* from ntdef.h */
+typedef LONG NTSTATUS;
+
+/* from ntddk.h */
+typedef struct _IO_STATUS_BLOCK {
+    union {
+        NTSTATUS Status;
+        PVOID Pointer;
+    };
+    ULONG_PTR Information;
+} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
+
+typedef enum _FSINFOCLASS {
+    FileFsAttributeInformation = 5,
+} FS_INFORMATION_CLASS, *PFS_INFORMATION_CLASS;
+
+/* from ntifs.h */
+
+typedef struct _FILE_FS_ATTRIBUTE_INFORMATION {
+    ULONG FileSystemAttributes;
+    LONG MaximumComponentNameLength;
+    ULONG FileSystemNameLength;
+    WCHAR FileSystemName[1];
+} FILE_FS_ATTRIBUTE_INFORMATION, *PFILE_FS_ATTRIBUTE_INFORMATION;
+
+extern "C" NTSTATUS NTAPI NtQueryVolumeInformationFile(HANDLE, PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS);
+
+/**
+ * Checks quickly if this is an correct root specification.
+ * Root specs ends with a slash of some kind.
+ *
+ * @returns indicator.
+ * @param   pszFsPath       Path to check.
+ */
+static bool rtFsIsRoot(const char *pszFsPath)
+{
+    /*
+     * UNC has exactly two slashes..
+     *
+     * Anything else starting with slashe(s) requires
+     * expansion and will have to take the long road.
+     */
+    if (RTPATH_IS_SLASH(pszFsPath[0]))
+    {
+        if (    !RTPATH_IS_SLASH(pszFsPath[1])
+            ||  RTPATH_IS_SLASH(pszFsPath[2]))
+            return false;
+
+        /* end of machine name */
+        const char *pszSlash = strpbrk(pszFsPath + 2, "\\/");
+        if (!pszSlash)
+            return false;
+
+        /* end of service name. */
+        pszSlash = strpbrk(pszSlash + 1, "\\/");
+        if (!pszSlash)
+            return false;
+
+        return pszSlash[1] == '\0';
+    }
+
+    /*
+     * Ok the other alternative is driver letter.
+     */
+    return  pszFsPath[0] >= 'A' && pszFsPath[0] <= 'Z'
+        &&  pszFsPath[1] == ':'
+        &&  RTPATH_IS_SLASH(pszFsPath[2])
+        && !pszFsPath[3];
+}
+
+
+
+/**
+ * Finds the root of the specified volume.
+ *
+ * @returns iprt status code.
+ * @param   pszFsPath       Path within the filesystem. Verified as one byte or more.
+ * @param   ppwszFsRoot     Where to store the returned string. Free with rtFsFreeRoot(),
+ */
+static int rtFsGetRoot(const char *pszFsPath, PRTUTF16 *ppwszFsRoot)
+{
+    /*
+     * Do straight forward stuff first,
+     */
+    if (rtFsIsRoot(pszFsPath))
+        return RTStrToUtf16(pszFsPath, ppwszFsRoot);
+
+    /*
+     * Expand and add slash (if required).
+     */
+    char szFullPath[RTPATH_MAX];
+    int rc = RTPathAbs(pszFsPath, szFullPath, sizeof(szFullPath));
+    if (RT_FAILURE(rc))
+        return rc;
+    size_t cb = strlen(szFullPath);
+    if (!RTPATH_IS_SLASH(szFullPath[cb - 1]))
+    {
+        AssertReturn(cb + 1 < RTPATH_MAX, VERR_FILENAME_TOO_LONG);
+        szFullPath[cb] = '\\';
+        szFullPath[++cb] = '\0';
+    }
+
+    /*
+     * Convert the path.
+     */
+    rc = RTStrToUtf16(szFullPath, ppwszFsRoot);
+    if (RT_FAILURE(rc))
+        return rc == VERR_BUFFER_OVERFLOW ? VERR_FILENAME_TOO_LONG : rc;
+
+    /*
+     * Walk the path until our proper API is happy or there is no more path left.
+     */
+    PRTUTF16 pwszStart = *ppwszFsRoot;
+    if (!GetVolumeInformationW(pwszStart, NULL, 0, NULL, NULL, 0, NULL, 0))
+    {
+        PRTUTF16 pwszEnd = pwszStart + RTUtf16Len(pwszStart);
+        PRTUTF16 pwszMin = pwszStart + 2;
+        do
+        {
+            /* Strip off the last path component. */
+            while (pwszEnd-- > pwszMin)
+                if (RTPATH_IS_SLASH(*pwszEnd))
+                    break;
+            AssertReturn(pwszEnd >= pwszMin, VERR_INTERNAL_ERROR); /* leaks, but that's irrelevant for an internal error. */
+            pwszEnd[1] = '\0';
+        } while (!GetVolumeInformationW(pwszStart, NULL, 0, NULL, NULL, 0, NULL, 0));
+    }
+
+    return VINF_SUCCESS;
+}
+
+/**
+ * Frees string returned by rtFsGetRoot().
+ */
+static void rtFsFreeRoot(PRTUTF16 pwszFsRoot)
+{
+    RTUtf16Free(pwszFsRoot);
+}
+
+
+RTR3DECL(int) RTFsQuerySizes(const char *pszFsPath, RTFOFF *pcbTotal, RTFOFF *pcbFree,
+                             uint32_t *pcbBlock, uint32_t *pcbSector)
+{
+    /*
+     * Validate & get valid root path.
+     */
+    AssertMsgReturn(VALID_PTR(pszFsPath) && *pszFsPath, ("%p", pszFsPath), VERR_INVALID_PARAMETER);
+    PRTUTF16 pwszFsRoot;
+    int rc = rtFsGetRoot(pszFsPath, &pwszFsRoot);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Free and total.
+     */
+    if (pcbTotal || pcbFree)
+    {
+        ULARGE_INTEGER cbTotal;
+        ULARGE_INTEGER cbFree;
+        if (GetDiskFreeSpaceExW(pwszFsRoot, &cbFree, &cbTotal, NULL))
+        {
+            if (pcbTotal)
+                *pcbTotal = cbTotal.QuadPart;
+            if (pcbFree)
+                *pcbFree  = cbFree.QuadPart;
+        }
+        else
+        {
+            DWORD Err = GetLastError();
+            rc = RTErrConvertFromWin32(Err);
+            Log(("RTFsQuerySizes(%s,): GetDiskFreeSpaceEx failed with lasterr %d (%Rrc)\n",
+                 pszFsPath, Err, rc));
+        }
+    }
+
+    /*
+     * Block and sector size.
+     */
+    if (    RT_SUCCESS(rc)
+        &&  (pcbBlock || pcbSector))
+    {
+        DWORD dwDummy1, dwDummy2;
+        DWORD cbSector;
+        DWORD cSectorsPerCluster;
+        if (GetDiskFreeSpaceW(pwszFsRoot, &cSectorsPerCluster, &cbSector, &dwDummy1, &dwDummy2))
+        {
+            if (pcbBlock)
+                *pcbBlock = cbSector * cSectorsPerCluster;
+            if (pcbSector)
+                *pcbSector = cbSector;
+        }
+        else
+        {
+            DWORD Err = GetLastError();
+            rc = RTErrConvertFromWin32(Err);
+            Log(("RTFsQuerySizes(%s,): GetDiskFreeSpace failed with lasterr %d (%Rrc)\n",
+                 pszFsPath, Err, rc));
+        }
+    }
+
+    rtFsFreeRoot(pwszFsRoot);
+    return rc;
+}
+
+
+/**
+ * Query the serial number of a filesystem.
+ *
+ * @returns iprt status code.
+ * @param   pszFsPath       Path within the mounted filesystem.
+ * @param   pu32Serial      Where to store the serial number.
+ */
+RTR3DECL(int) RTFsQuerySerial(const char *pszFsPath, uint32_t *pu32Serial)
+{
+    /*
+     * Validate & get valid root path.
+     */
+    AssertMsgReturn(VALID_PTR(pszFsPath) && *pszFsPath, ("%p", pszFsPath), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(VALID_PTR(pu32Serial), ("%p", pu32Serial), VERR_INVALID_PARAMETER);
+    PRTUTF16 pwszFsRoot;
+    int rc = rtFsGetRoot(pszFsPath, &pwszFsRoot);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Do work.
+     */
+    DWORD   dwMaxName;
+    DWORD   dwFlags;
+    DWORD   dwSerial;
+    if (GetVolumeInformationW(pwszFsRoot, NULL, 0, &dwSerial, &dwMaxName, &dwFlags, NULL, 0))
+        *pu32Serial = dwSerial;
+    else
+    {
+        DWORD Err = GetLastError();
+        rc = RTErrConvertFromWin32(Err);
+        Log(("RTFsQuerySizes(%s,): GetDiskFreeSpaceEx failed with lasterr %d (%Rrc)\n",
+             pszFsPath, Err, rc));
+    }
+
+    rtFsFreeRoot(pwszFsRoot);
+    return rc;
+}
+
+
+/**
+ * Query the properties of a mounted filesystem.
+ *
+ * @returns iprt status code.
+ * @param   pszFsPath       Path within the mounted filesystem.
+ * @param   pProperties     Where to store the properties.
+ */
+RTR3DECL(int) RTFsQueryProperties(const char *pszFsPath, PRTFSPROPERTIES pProperties)
+{
+    /*
+     * Validate & get valid root path.
+     */
+    AssertMsgReturn(VALID_PTR(pszFsPath) && *pszFsPath, ("%p", pszFsPath), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(VALID_PTR(pProperties), ("%p", pProperties), VERR_INVALID_PARAMETER);
+    PRTUTF16 pwszFsRoot;
+    int rc = rtFsGetRoot(pszFsPath, &pwszFsRoot);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Do work.
+     */
+    DWORD   dwMaxName;
+    DWORD   dwFlags;
+    DWORD   dwSerial;
+    if (GetVolumeInformationW(pwszFsRoot, NULL, 0, &dwSerial, &dwMaxName, &dwFlags, NULL, 0))
+    {
+        memset(pProperties, 0, sizeof(*pProperties));
+        pProperties->cbMaxComponent   = dwMaxName;
+        pProperties->fFileCompression = !!(dwFlags & FILE_FILE_COMPRESSION);
+        pProperties->fCompressed      = !!(dwFlags & FILE_VOLUME_IS_COMPRESSED);
+        pProperties->fReadOnly        = !!(dwFlags & FILE_READ_ONLY_VOLUME);
+        pProperties->fSupportsUnicode = !!(dwFlags & FILE_UNICODE_ON_DISK);
+        pProperties->fCaseSensitive   = false;    /* win32 is case preserving only */
+        /** @todo r=bird: What about FILE_CASE_SENSITIVE_SEARCH ?  Is this set for NTFS
+         *        as well perchance?  If so, better mention it instead of just setting
+         *        fCaseSensitive to false. */
+        pProperties->fRemote          = false;    /* no idea yet */
+    }
+    else
+    {
+        DWORD Err = GetLastError();
+        rc = RTErrConvertFromWin32(Err);
+        Log(("RTFsQuerySizes(%s,): GetVolumeInformation failed with lasterr %d (%Rrc)\n",
+             pszFsPath, Err, rc));
+    }
+
+    rtFsFreeRoot(pwszFsRoot);
+    return rc;
+}
+
+
+RTR3DECL(bool) RTFsIsCaseSensitive(const char *pszFsPath)
+{
+    return false;
+}
+
+
+/**
+ * Internal helper for comparing a WCHAR string with a char string.
+ *
+ * @returns @c true if equal, @c false if not.
+ * @param   pwsz1               The first string.
+ * @param   cch1                The length of the first string, in bytes.
+ * @param   psz2                The second string.
+ * @param   cch2                The length of the second string.
+ */
+static bool rtFsWinAreEqual(WCHAR const *pwsz1, size_t cch1, const char *psz2, size_t cch2)
+{
+    if (cch1 != cch2 * 2)
+        return false;
+    while (cch2-- > 0)
+    {
+        unsigned ch1 = *pwsz1++;
+        unsigned ch2 = (unsigned char)*psz2++;
+        if (ch1 != ch2)
+            return false;
+    }
+    return true;
+}
+
+
+RTR3DECL(int) RTFsQueryType(const char *pszFsPath, PRTFSTYPE penmType)
+{
+    *penmType = RTFSTYPE_UNKNOWN;
+
+    AssertPtrReturn(pszFsPath, VERR_INVALID_POINTER);
+    AssertReturn(*pszFsPath, VERR_INVALID_PARAMETER);
+
+    /*
+     * Convert the path and try open it.
+     */
+    PRTUTF16 pwszFsPath;
+    int rc = RTPathWinFromUtf8(&pwszFsPath, pszFsPath, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        HANDLE hFile = CreateFileW(pwszFsPath,
+                                   GENERIC_READ,
+                                   FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                                   NULL,
+                                   OPEN_EXISTING,
+                                   FILE_FLAG_BACKUP_SEMANTICS,
+                                   NULL);
+        if (hFile != INVALID_HANDLE_VALUE)
+        {
+            /*
+             * Use the NT api directly to get the file system name.
+             */
+            char            abBuf[8192];
+            IO_STATUS_BLOCK Ios;
+            NTSTATUS        rcNt = NtQueryVolumeInformationFile(hFile, &Ios,
+                                                                abBuf, sizeof(abBuf),
+                                                                FileFsAttributeInformation);
+            if (rcNt >= 0)
+            {
+                PFILE_FS_ATTRIBUTE_INFORMATION pFsAttrInfo = (PFILE_FS_ATTRIBUTE_INFORMATION)abBuf;
+#define IS_FS(szName) \
+    rtFsWinAreEqual(pFsAttrInfo->FileSystemName, pFsAttrInfo->FileSystemNameLength, szName, sizeof(szName) - 1)
+                if (IS_FS("NTFS"))
+                    *penmType = RTFSTYPE_NTFS;
+                else if (IS_FS("FAT"))
+                    *penmType = RTFSTYPE_FAT;
+                else if (IS_FS("FAT32"))
+                    *penmType = RTFSTYPE_FAT;
+                else if (IS_FS("EXFAT"))
+                    *penmType = RTFSTYPE_EXFAT;
+                else if (IS_FS("VBoxSharedFolderFS"))
+                    *penmType = RTFSTYPE_VBOXSHF;
+#undef IS_FS
+            }
+            else
+                rc = RTErrConvertFromNtStatus(rcNt);
+            CloseHandle(hFile);
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+        RTPathWinFree(pwszFsPath);
+    }
+    return rc;
+}
diff --git a/src/VBox/Runtime/r3/win/init-win.cpp b/src/VBox/Runtime/r3/win/init-win.cpp
new file mode 100644
index 00000000..ae74cf48
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/init-win.cpp
@@ -0,0 +1,801 @@
+/* $Id: init-win.cpp $ */
+/** @file
+ * IPRT - Init Ring-3, Windows Specific Code.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_DEFAULT
+#include <iprt/nt/nt-and-windows.h>
+#ifndef LOAD_LIBRARY_SEARCH_APPLICATION_DIR
+# define LOAD_LIBRARY_SEARCH_APPLICATION_DIR    0x200
+# define LOAD_LIBRARY_SEARCH_SYSTEM32           0x800
+#endif
+
+#include "internal-r3-win.h"
+#include <iprt/initterm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/ldr.h>
+#include <iprt/log.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/thread.h>
+#include "../init.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef VOID (WINAPI *PFNGETCURRENTTHREADSTACKLIMITS)(PULONG_PTR puLow, PULONG_PTR puHigh);
+typedef LPTOP_LEVEL_EXCEPTION_FILTER (WINAPI * PFNSETUNHANDLEDEXCEPTIONFILTER)(LPTOP_LEVEL_EXCEPTION_FILTER);
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Windows DLL loader protection level. */
+DECLHIDDEN(RTR3WINLDRPROT)      g_enmWinLdrProt = RTR3WINLDRPROT_NONE;
+/** Our simplified windows version.    */
+DECLHIDDEN(RTWINOSTYPE)         g_enmWinVer = kRTWinOSType_UNKNOWN;
+/** Extended windows version information. */
+DECLHIDDEN(OSVERSIONINFOEXW)    g_WinOsInfoEx;
+
+/** The native kernel32.dll handle. */
+DECLHIDDEN(HMODULE)                         g_hModKernel32 = NULL;
+/** GetSystemWindowsDirectoryW or GetWindowsDirectoryW (NT4). */
+DECLHIDDEN(PFNGETWINSYSDIR)                 g_pfnGetSystemWindowsDirectoryW = NULL;
+/** The GetCurrentThreadStackLimits API. */
+static PFNGETCURRENTTHREADSTACKLIMITS       g_pfnGetCurrentThreadStackLimits = NULL;
+/** SetUnhandledExceptionFilter. */
+static PFNSETUNHANDLEDEXCEPTIONFILTER       g_pfnSetUnhandledExceptionFilter = NULL;
+/** The previous unhandled exception filter. */
+static LPTOP_LEVEL_EXCEPTION_FILTER         g_pfnUnhandledXcptFilter = NULL;
+/** SystemTimeToTzSpecificLocalTime. */
+decltype(SystemTimeToTzSpecificLocalTime)  *g_pfnSystemTimeToTzSpecificLocalTime = NULL;
+
+/** The native ntdll.dll handle. */
+DECLHIDDEN(HMODULE)                         g_hModNtDll = NULL;
+/** NtQueryFullAttributesFile   */
+DECLHIDDEN(PFNNTQUERYFULLATTRIBUTESFILE)    g_pfnNtQueryFullAttributesFile = NULL;
+/** NtDuplicateToken (NT 3.51). */
+DECLHIDDEN(PFNNTDUPLICATETOKEN)             g_pfnNtDuplicateToken = NULL;
+/** NtAlertThread (NT 3.51). */
+decltype(NtAlertThread)                    *g_pfnNtAlertThread = NULL;
+
+/** Either ws2_32.dll (NT4+) or wsock32.dll (NT3.x). */
+DECLHIDDEN(HMODULE)                         g_hModWinSock = NULL;
+/** Set if we're dealing with old winsock.   */
+DECLHIDDEN(bool)                            g_fOldWinSock = false;
+/** WSAStartup   */
+DECLHIDDEN(PFNWSASTARTUP)                   g_pfnWSAStartup = NULL;
+/** WSACleanup */
+DECLHIDDEN(PFNWSACLEANUP)                   g_pfnWSACleanup = NULL;
+/** Pointner to WSAGetLastError (for RTErrVarsSave). */
+DECLHIDDEN(PFNWSAGETLASTERROR)              g_pfnWSAGetLastError = NULL;
+/** Pointner to WSASetLastError (for RTErrVarsRestore). */
+DECLHIDDEN(PFNWSASETLASTERROR)              g_pfnWSASetLastError = NULL;
+/** WSACreateEvent */
+DECLHIDDEN(PFNWSACREATEEVENT)               g_pfnWSACreateEvent = NULL;
+/** WSACloseEvent  */
+DECLHIDDEN(PFNWSACLOSEEVENT)                g_pfnWSACloseEvent = NULL;
+/** WSASetEvent */
+DECLHIDDEN(PFNWSASETEVENT)                  g_pfnWSASetEvent = NULL;
+/** WSAEventSelect   */
+DECLHIDDEN(PFNWSAEVENTSELECT)               g_pfnWSAEventSelect = NULL;
+/** WSAEnumNetworkEvents */
+DECLHIDDEN(PFNWSAENUMNETWORKEVENTS)         g_pfnWSAEnumNetworkEvents = NULL;
+/** WSASend */
+DECLHIDDEN(PFNWSASend)                      g_pfnWSASend = NULL;
+/** socket */
+DECLHIDDEN(PFNWINSOCKSOCKET)                g_pfnsocket = NULL;
+/** closesocket */
+DECLHIDDEN(PFNWINSOCKCLOSESOCKET)           g_pfnclosesocket = NULL;
+/** recv */
+DECLHIDDEN(PFNWINSOCKRECV)                  g_pfnrecv = NULL;
+/** send */
+DECLHIDDEN(PFNWINSOCKSEND)                  g_pfnsend = NULL;
+/** recvfrom */
+DECLHIDDEN(PFNWINSOCKRECVFROM)              g_pfnrecvfrom = NULL;
+/** sendto */
+DECLHIDDEN(PFNWINSOCKSENDTO)                g_pfnsendto = NULL;
+/** bind */
+DECLHIDDEN(PFNWINSOCKBIND)                  g_pfnbind = NULL;
+/** listen  */
+DECLHIDDEN(PFNWINSOCKLISTEN)                g_pfnlisten = NULL;
+/** accept */
+DECLHIDDEN(PFNWINSOCKACCEPT)                g_pfnaccept = NULL;
+/** connect */
+DECLHIDDEN(PFNWINSOCKCONNECT)               g_pfnconnect = NULL;
+/** shutdown */
+DECLHIDDEN(PFNWINSOCKSHUTDOWN)              g_pfnshutdown = NULL;
+/** getsockopt */
+DECLHIDDEN(PFNWINSOCKGETSOCKOPT)            g_pfngetsockopt = NULL;
+/** setsockopt */
+DECLHIDDEN(PFNWINSOCKSETSOCKOPT)            g_pfnsetsockopt = NULL;
+/** ioctlsocket */
+DECLHIDDEN(PFNWINSOCKIOCTLSOCKET)           g_pfnioctlsocket = NULL;
+/** getpeername   */
+DECLHIDDEN(PFNWINSOCKGETPEERNAME)           g_pfngetpeername = NULL;
+/** getsockname */
+DECLHIDDEN(PFNWINSOCKGETSOCKNAME)           g_pfngetsockname = NULL;
+/** __WSAFDIsSet */
+DECLHIDDEN(PFNWINSOCK__WSAFDISSET)          g_pfn__WSAFDIsSet = NULL;
+/** select */
+DECLHIDDEN(PFNWINSOCKSELECT)                g_pfnselect = NULL;
+/** gethostbyname */
+DECLHIDDEN(PFNWINSOCKGETHOSTBYNAME)         g_pfngethostbyname = NULL;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static LONG CALLBACK rtR3WinUnhandledXcptFilter(PEXCEPTION_POINTERS);
+
+
+/**
+ * Translates OSVERSIONINOFEX into a Windows OS type.
+ *
+ * @returns The Windows OS type.
+ * @param   pOSInfoEx       The OS info returned by Windows.
+ *
+ * @remarks This table has been assembled from Usenet postings, personal
+ *          observations, and reading other people's code.  Please feel
+ *          free to add to it or correct it.
+ * <pre>
+         dwPlatFormID  dwMajorVersion  dwMinorVersion  dwBuildNumber
+95             1              4               0             950
+95 SP1         1              4               0        >950 && <=1080
+95 OSR2        1              4             <10           >1080
+98             1              4              10            1998
+98 SP1         1              4              10       >1998 && <2183
+98 SE          1              4              10          >=2183
+ME             1              4              90            3000
+
+NT 3.51        2              3              51            1057
+NT 4           2              4               0            1381
+2000           2              5               0            2195
+XP             2              5               1            2600
+2003           2              5               2            3790
+Vista          2              6               0
+
+CE 1.0         3              1               0
+CE 2.0         3              2               0
+CE 2.1         3              2               1
+CE 3.0         3              3               0
+</pre>
+ */
+static RTWINOSTYPE rtR3InitWinSimplifiedVersion(OSVERSIONINFOEXW const *pOSInfoEx)
+{
+    RTWINOSTYPE enmVer         = kRTWinOSType_UNKNOWN;
+    BYTE  const bProductType   = pOSInfoEx->wProductType;
+    DWORD const dwPlatformId   = pOSInfoEx->dwPlatformId;
+    DWORD const dwMinorVersion = pOSInfoEx->dwMinorVersion;
+    DWORD const dwMajorVersion = pOSInfoEx->dwMajorVersion;
+    DWORD const dwBuildNumber  = pOSInfoEx->dwBuildNumber & 0xFFFF;   /* Win 9x needs this. */
+
+    if (    dwPlatformId == VER_PLATFORM_WIN32_WINDOWS
+        &&  dwMajorVersion == 4)
+    {
+        if (        dwMinorVersion < 10
+                 && dwBuildNumber == 950)
+            enmVer = kRTWinOSType_95;
+        else if (   dwMinorVersion < 10
+                 && dwBuildNumber > 950
+                 && dwBuildNumber <= 1080)
+            enmVer = kRTWinOSType_95SP1;
+        else if (   dwMinorVersion < 10
+                 && dwBuildNumber > 1080)
+            enmVer = kRTWinOSType_95OSR2;
+        else if (   dwMinorVersion == 10
+                 && dwBuildNumber == 1998)
+            enmVer = kRTWinOSType_98;
+        else if (   dwMinorVersion == 10
+                 && dwBuildNumber > 1998
+                 && dwBuildNumber < 2183)
+            enmVer = kRTWinOSType_98SP1;
+        else if (   dwMinorVersion == 10
+                 && dwBuildNumber >= 2183)
+            enmVer = kRTWinOSType_98SE;
+        else if (dwMinorVersion == 90)
+            enmVer = kRTWinOSType_ME;
+    }
+    else if (dwPlatformId == VER_PLATFORM_WIN32_NT)
+    {
+        if (dwMajorVersion == 3)
+        {
+            if (     dwMinorVersion < 50)
+                enmVer = kRTWinOSType_NT310;
+            else if (dwMinorVersion == 50)
+                enmVer = kRTWinOSType_NT350;
+            else
+                enmVer = kRTWinOSType_NT351;
+        }
+        else if (dwMajorVersion == 4)
+            enmVer = kRTWinOSType_NT4;
+        else if (dwMajorVersion == 5)
+        {
+            if (dwMinorVersion == 0)
+                enmVer = kRTWinOSType_2K;
+            else if (dwMinorVersion == 1)
+                enmVer = kRTWinOSType_XP;
+            else
+                enmVer = kRTWinOSType_2003;
+        }
+        else if (dwMajorVersion == 6)
+        {
+            if (dwMinorVersion == 0)
+                enmVer = bProductType != VER_NT_WORKSTATION ? kRTWinOSType_2008   : kRTWinOSType_VISTA;
+            else if (dwMinorVersion == 1)
+                enmVer = bProductType != VER_NT_WORKSTATION ? kRTWinOSType_2008R2 : kRTWinOSType_7;
+            else if (dwMinorVersion == 2)
+                enmVer = bProductType != VER_NT_WORKSTATION ? kRTWinOSType_2012   : kRTWinOSType_8;
+            else if (dwMinorVersion == 3)
+                enmVer = bProductType != VER_NT_WORKSTATION ? kRTWinOSType_2012R2 : kRTWinOSType_81;
+            else if (dwMinorVersion == 4)
+                enmVer = bProductType != VER_NT_WORKSTATION ? kRTWinOSType_2016   : kRTWinOSType_10;
+            else
+                enmVer = kRTWinOSType_NT_UNKNOWN;
+        }
+        else if (dwMajorVersion == 10)
+        {
+            if (dwMinorVersion == 0)
+                enmVer = bProductType != VER_NT_WORKSTATION ? kRTWinOSType_2016   : kRTWinOSType_10;
+            else
+                enmVer = kRTWinOSType_NT_UNKNOWN;
+        }
+        else
+            enmVer = kRTWinOSType_NT_UNKNOWN;
+    }
+
+    return enmVer;
+}
+
+
+/**
+ * Initializes the global variables related to windows version.
+ */
+static void rtR3InitWindowsVersion(void)
+{
+    Assert(g_hModNtDll != NULL);
+
+    /*
+     * ASSUMES OSVERSIONINFOEX starts with the exact same layout as OSVERSIONINFO (safe).
+     */
+    AssertCompileMembersSameSizeAndOffset(OSVERSIONINFOEX, szCSDVersion, OSVERSIONINFO, szCSDVersion);
+    AssertCompileMemberOffset(OSVERSIONINFOEX, wServicePackMajor, sizeof(OSVERSIONINFO));
+
+    /*
+     * Use the NT version of GetVersionExW so we don't get fooled by
+     * compatability shims.
+     */
+    RT_ZERO(g_WinOsInfoEx);
+    g_WinOsInfoEx.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+
+    LONG (__stdcall *pfnRtlGetVersion)(OSVERSIONINFOEXW *);
+    *(FARPROC *)&pfnRtlGetVersion = GetProcAddress(g_hModNtDll, "RtlGetVersion");
+    LONG rcNt = -1;
+    if (pfnRtlGetVersion)
+        rcNt = pfnRtlGetVersion(&g_WinOsInfoEx);
+    if (rcNt != 0)
+    {
+        /*
+         * Couldn't find it or it failed, try the windows version of the API.
+         */
+        RT_ZERO(g_WinOsInfoEx);
+        g_WinOsInfoEx.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+        if (!GetVersionExW((POSVERSIONINFOW)&g_WinOsInfoEx))
+        {
+            /*
+             * If that didn't work either, just get the basic version bits.
+             */
+            RT_ZERO(g_WinOsInfoEx);
+            g_WinOsInfoEx.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
+            if (GetVersionExW((POSVERSIONINFOW)&g_WinOsInfoEx))
+                Assert(g_WinOsInfoEx.dwPlatformId != VER_PLATFORM_WIN32_NT || g_WinOsInfoEx.dwMajorVersion < 5);
+            else
+            {
+                AssertBreakpoint();
+                RT_ZERO(g_WinOsInfoEx);
+            }
+        }
+    }
+
+    if (g_WinOsInfoEx.dwOSVersionInfoSize)
+        g_enmWinVer = rtR3InitWinSimplifiedVersion(&g_WinOsInfoEx);
+}
+
+
+/**
+ * Resolves the winsock error APIs.
+ */
+static void rtR3InitWinSockApis(void)
+{
+    /*
+     * Try get ws2_32.dll, then try load it, then finally fall back to the old
+     * wsock32.dll.  We use RTLdrLoadSystem to the loading as it has all the fancy
+     * logic for safely doing that.
+     */
+    g_hModWinSock = GetModuleHandleW(L"ws2_32.dll");
+    if (g_hModWinSock == NULL)
+    {
+        RTLDRMOD hLdrMod;
+        int rc = RTLdrLoadSystem("ws2_32.dll", true /*fNoUnload*/, &hLdrMod);
+        if (RT_FAILURE(rc))
+        {
+            rc = RTLdrLoadSystem("wsock32.dll", true /*fNoUnload*/, &hLdrMod);
+            if (RT_FAILURE(rc))
+            {
+                AssertMsgFailed(("rc=%Rrc\n", rc));
+                return;
+            }
+            g_fOldWinSock = true;
+        }
+        g_hModWinSock = (HMODULE)RTLdrGetNativeHandle(hLdrMod);
+        RTLdrClose(hLdrMod);
+    }
+
+    g_pfnWSAStartup           = (decltype(g_pfnWSAStartup))         GetProcAddress(g_hModWinSock, "WSAStartup");
+    g_pfnWSACleanup           = (decltype(g_pfnWSACleanup))         GetProcAddress(g_hModWinSock, "WSACleanup");
+    g_pfnWSAGetLastError      = (decltype(g_pfnWSAGetLastError))    GetProcAddress(g_hModWinSock, "WSAGetLastError");
+    g_pfnWSASetLastError      = (decltype(g_pfnWSASetLastError))    GetProcAddress(g_hModWinSock, "WSASetLastError");
+    g_pfnWSACreateEvent       = (decltype(g_pfnWSACreateEvent))     GetProcAddress(g_hModWinSock, "WSACreateEvent");
+    g_pfnWSACloseEvent        = (decltype(g_pfnWSACloseEvent))      GetProcAddress(g_hModWinSock, "WSACloseEvent");
+    g_pfnWSASetEvent          = (decltype(g_pfnWSASetEvent))        GetProcAddress(g_hModWinSock, "WSASetEvent");
+    g_pfnWSAEventSelect       = (decltype(g_pfnWSAEventSelect))     GetProcAddress(g_hModWinSock, "WSAEventSelect");
+    g_pfnWSAEnumNetworkEvents = (decltype(g_pfnWSAEnumNetworkEvents))GetProcAddress(g_hModWinSock,"WSAEnumNetworkEvents");
+    g_pfnWSASend              = (decltype(g_pfnWSASend))            GetProcAddress(g_hModWinSock, "WSASend");
+    g_pfnsocket               = (decltype(g_pfnsocket))             GetProcAddress(g_hModWinSock, "socket");
+    g_pfnclosesocket          = (decltype(g_pfnclosesocket))        GetProcAddress(g_hModWinSock, "closesocket");
+    g_pfnrecv                 = (decltype(g_pfnrecv))               GetProcAddress(g_hModWinSock, "recv");
+    g_pfnsend                 = (decltype(g_pfnsend))               GetProcAddress(g_hModWinSock, "send");
+    g_pfnrecvfrom             = (decltype(g_pfnrecvfrom))           GetProcAddress(g_hModWinSock, "recvfrom");
+    g_pfnsendto               = (decltype(g_pfnsendto))             GetProcAddress(g_hModWinSock, "sendto");
+    g_pfnbind                 = (decltype(g_pfnbind))               GetProcAddress(g_hModWinSock, "bind");
+    g_pfnlisten               = (decltype(g_pfnlisten))             GetProcAddress(g_hModWinSock, "listen");
+    g_pfnaccept               = (decltype(g_pfnaccept))             GetProcAddress(g_hModWinSock, "accept");
+    g_pfnconnect              = (decltype(g_pfnconnect))            GetProcAddress(g_hModWinSock, "connect");
+    g_pfnshutdown             = (decltype(g_pfnshutdown))           GetProcAddress(g_hModWinSock, "shutdown");
+    g_pfngetsockopt           = (decltype(g_pfngetsockopt))         GetProcAddress(g_hModWinSock, "getsockopt");
+    g_pfnsetsockopt           = (decltype(g_pfnsetsockopt))         GetProcAddress(g_hModWinSock, "setsockopt");
+    g_pfnioctlsocket          = (decltype(g_pfnioctlsocket))        GetProcAddress(g_hModWinSock, "ioctlsocket");
+    g_pfngetpeername          = (decltype(g_pfngetpeername))        GetProcAddress(g_hModWinSock, "getpeername");
+    g_pfngetsockname          = (decltype(g_pfngetsockname))        GetProcAddress(g_hModWinSock, "getsockname");
+    g_pfn__WSAFDIsSet         = (decltype(g_pfn__WSAFDIsSet))       GetProcAddress(g_hModWinSock, "__WSAFDIsSet");
+    g_pfnselect               = (decltype(g_pfnselect))             GetProcAddress(g_hModWinSock, "select");
+    g_pfngethostbyname        = (decltype(g_pfngethostbyname))      GetProcAddress(g_hModWinSock, "gethostbyname");
+
+    Assert(g_pfnWSAStartup);
+    Assert(g_pfnWSACleanup);
+    Assert(g_pfnWSAGetLastError);
+    Assert(g_pfnWSASetLastError);
+    Assert(g_pfnWSACreateEvent       || g_fOldWinSock);
+    Assert(g_pfnWSACloseEvent        || g_fOldWinSock);
+    Assert(g_pfnWSASetEvent          || g_fOldWinSock);
+    Assert(g_pfnWSAEventSelect       || g_fOldWinSock);
+    Assert(g_pfnWSAEnumNetworkEvents || g_fOldWinSock);
+    Assert(g_pfnWSASend              || g_fOldWinSock);
+    Assert(g_pfnsocket);
+    Assert(g_pfnclosesocket);
+    Assert(g_pfnrecv);
+    Assert(g_pfnsend);
+    Assert(g_pfnrecvfrom);
+    Assert(g_pfnsendto);
+    Assert(g_pfnbind);
+    Assert(g_pfnlisten);
+    Assert(g_pfnaccept);
+    Assert(g_pfnconnect);
+    Assert(g_pfnshutdown);
+    Assert(g_pfngetsockopt);
+    Assert(g_pfnsetsockopt);
+    Assert(g_pfnioctlsocket);
+    Assert(g_pfngetpeername);
+    Assert(g_pfngetsockname);
+    Assert(g_pfn__WSAFDIsSet);
+    Assert(g_pfnselect);
+    Assert(g_pfngethostbyname);
+}
+
+
+static int rtR3InitNativeObtrusiveWorker(uint32_t fFlags)
+{
+    /*
+     * Disable error popups.
+     */
+    UINT fOldErrMode = SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX | fOldErrMode);
+
+    /*
+     * Restrict DLL searching for the process on windows versions which allow
+     * us to do so.
+     *  - The first trick works on XP SP1+ and disables the searching of the
+     *    current directory.
+     *  - The second trick is W7 w/ KB2533623 and W8+, it restrict the DLL
+     *    searching to the application directory (except when
+     *    RTR3INIT_FLAGS_STANDALONE_APP is given) and the System32 directory.
+     */
+    int rc = VINF_SUCCESS;
+
+    typedef BOOL (WINAPI *PFNSETDLLDIRECTORY)(LPCWSTR);
+    PFNSETDLLDIRECTORY pfnSetDllDir = (PFNSETDLLDIRECTORY)GetProcAddress(g_hModKernel32, "SetDllDirectoryW");
+    if (pfnSetDllDir)
+    {
+        if (pfnSetDllDir(L""))
+            g_enmWinLdrProt = RTR3WINLDRPROT_NO_CWD;
+        else
+            rc = VERR_INTERNAL_ERROR_3;
+    }
+
+    /** @bugref{6861} Observed GUI issues on Vista (32-bit and 64-bit) when using
+     *                SetDefaultDllDirectories.
+     *  @bugref{8194} Try use SetDefaultDllDirectories on Vista for standalone apps
+     *                despite potential GUI issues. */
+    if (   g_enmWinVer > kRTWinOSType_VISTA
+        || (fFlags & RTR3INIT_FLAGS_STANDALONE_APP))
+    {
+        typedef BOOL(WINAPI *PFNSETDEFAULTDLLDIRECTORIES)(DWORD);
+        PFNSETDEFAULTDLLDIRECTORIES pfnSetDefDllDirs;
+        pfnSetDefDllDirs = (PFNSETDEFAULTDLLDIRECTORIES)GetProcAddress(g_hModKernel32, "SetDefaultDllDirectories");
+        if (pfnSetDefDllDirs)
+        {
+            DWORD fDllDirs = LOAD_LIBRARY_SEARCH_SYSTEM32;
+            if (!(fFlags & RTR3INIT_FLAGS_STANDALONE_APP))
+                fDllDirs |= LOAD_LIBRARY_SEARCH_APPLICATION_DIR;
+            if (pfnSetDefDllDirs(fDllDirs))
+                g_enmWinLdrProt = fDllDirs & LOAD_LIBRARY_SEARCH_APPLICATION_DIR ? RTR3WINLDRPROT_SAFE : RTR3WINLDRPROT_SAFER;
+            else if (RT_SUCCESS(rc))
+                rc = VERR_INTERNAL_ERROR_4;
+        }
+    }
+
+    /*
+     * Register an unhandled exception callback if we can.
+     */
+    g_pfnGetCurrentThreadStackLimits = (PFNGETCURRENTTHREADSTACKLIMITS)GetProcAddress(g_hModKernel32, "GetCurrentThreadStackLimits");
+    g_pfnSetUnhandledExceptionFilter = (PFNSETUNHANDLEDEXCEPTIONFILTER)GetProcAddress(g_hModKernel32, "SetUnhandledExceptionFilter");
+    if (g_pfnSetUnhandledExceptionFilter && !g_pfnUnhandledXcptFilter)
+    {
+        g_pfnUnhandledXcptFilter = g_pfnSetUnhandledExceptionFilter(rtR3WinUnhandledXcptFilter);
+        AssertStmt(g_pfnUnhandledXcptFilter != rtR3WinUnhandledXcptFilter, g_pfnUnhandledXcptFilter = NULL);
+    }
+
+    return rc;
+}
+
+
+DECLHIDDEN(int) rtR3InitNativeFirst(uint32_t fFlags)
+{
+    /*
+     * Make sure we've got the handles of the two main Windows NT dlls.
+     */
+    g_hModKernel32 = GetModuleHandleW(L"kernel32.dll");
+    if (g_hModKernel32 == NULL)
+        return VERR_INTERNAL_ERROR_2;
+    g_hModNtDll    = GetModuleHandleW(L"ntdll.dll");
+    if (g_hModNtDll == NULL)
+        return VERR_INTERNAL_ERROR_2;
+
+    rtR3InitWindowsVersion();
+
+    int rc = VINF_SUCCESS;
+    if (!(fFlags & RTR3INIT_FLAGS_UNOBTRUSIVE))
+        rc = rtR3InitNativeObtrusiveWorker(fFlags);
+
+    /*
+     * Resolve some kernel32.dll APIs we may need but aren't necessarily
+     * present in older windows versions.
+     */
+    g_pfnGetSystemWindowsDirectoryW = (PFNGETWINSYSDIR)GetProcAddress(g_hModKernel32, "GetSystemWindowsDirectoryW");
+    if (g_pfnGetSystemWindowsDirectoryW)
+        g_pfnGetSystemWindowsDirectoryW = (PFNGETWINSYSDIR)GetProcAddress(g_hModKernel32, "GetWindowsDirectoryW");
+    g_pfnSystemTimeToTzSpecificLocalTime = (decltype(SystemTimeToTzSpecificLocalTime) *)GetProcAddress(g_hModKernel32, "SystemTimeToTzSpecificLocalTime");
+
+    /*
+     * Resolve some ntdll.dll APIs that weren't there in early NT versions.
+     */
+    g_pfnNtQueryFullAttributesFile = (PFNNTQUERYFULLATTRIBUTESFILE)GetProcAddress(g_hModNtDll, "NtQueryFullAttributesFile");
+    g_pfnNtDuplicateToken          = (PFNNTDUPLICATETOKEN)GetProcAddress(         g_hModNtDll, "NtDuplicateToken");
+    g_pfnNtAlertThread             = (decltype(NtAlertThread) *)GetProcAddress(   g_hModNtDll, "NtAlertThread");
+
+    /*
+     * Resolve the winsock error getter and setter so assertions can save those too.
+     */
+    rtR3InitWinSockApis();
+
+    return rc;
+}
+
+
+DECLHIDDEN(void) rtR3InitNativeObtrusive(uint32_t fFlags)
+{
+    rtR3InitNativeObtrusiveWorker(fFlags);
+}
+
+
+DECLHIDDEN(int) rtR3InitNativeFinal(uint32_t fFlags)
+{
+    /* Nothing to do here. */
+    RT_NOREF_PV(fFlags);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Unhandled exception filter callback.
+ *
+ * Will try log stuff.
+ */
+static LONG CALLBACK rtR3WinUnhandledXcptFilter(PEXCEPTION_POINTERS pPtrs)
+{
+    /*
+     * Try get the logger and log exception details.
+     *
+     * Note! We'll be using RTLogLogger for now, though we should probably add
+     *       a less deadlock prone API here and gives up pretty fast if it
+     *       cannot get the lock...
+     */
+    PRTLOGGER pLogger = RTLogRelGetDefaultInstance();
+    if (!pLogger)
+        pLogger = RTLogGetDefaultInstance();
+    if (pLogger)
+    {
+        RTLogLogger(pLogger, NULL, "\n!!! rtR3WinUnhandledXcptFilter caught an exception on thread %p!!!\n", RTThreadNativeSelf());
+
+        /*
+         * Dump the exception record.
+         */
+        uintptr_t         uXcptPC  = 0;
+        PEXCEPTION_RECORD pXcptRec = RT_VALID_PTR(pPtrs) && RT_VALID_PTR(pPtrs->ExceptionRecord) ? pPtrs->ExceptionRecord : NULL;
+        if (pXcptRec)
+        {
+            RTLogLogger(pLogger, NULL, "\nExceptionCode=%#010x ExceptionFlags=%#010x ExceptionAddress=%p\n",
+                        pXcptRec->ExceptionCode, pXcptRec->ExceptionFlags, pXcptRec->ExceptionAddress);
+            for (uint32_t i = 0; i < RT_MIN(pXcptRec->NumberParameters, EXCEPTION_MAXIMUM_PARAMETERS); i++)
+                RTLogLogger(pLogger, NULL, "ExceptionInformation[%d]=%p\n", i, pXcptRec->ExceptionInformation[i]);
+            uXcptPC = (uintptr_t)pXcptRec->ExceptionAddress;
+
+            /* Nested? Display one level only. */
+            PEXCEPTION_RECORD pNestedRec = pXcptRec->ExceptionRecord;
+            if (RT_VALID_PTR(pNestedRec))
+            {
+                RTLogLogger(pLogger, NULL, "Nested: ExceptionCode=%#010x ExceptionFlags=%#010x ExceptionAddress=%p (nested %p)\n",
+                            pNestedRec->ExceptionCode, pNestedRec->ExceptionFlags, pNestedRec->ExceptionAddress,
+                            pNestedRec->ExceptionRecord);
+                for (uint32_t i = 0; i < RT_MIN(pNestedRec->NumberParameters, EXCEPTION_MAXIMUM_PARAMETERS); i++)
+                    RTLogLogger(pLogger, NULL, "Nested: ExceptionInformation[%d]=%p\n", i, pNestedRec->ExceptionInformation[i]);
+                uXcptPC = (uintptr_t)pNestedRec->ExceptionAddress;
+            }
+        }
+
+        /*
+         * Dump the context record.
+         */
+        volatile char   szMarker[] = "stackmarker";
+        uintptr_t       uXcptSP = (uintptr_t)&szMarker[0];
+        PCONTEXT pXcptCtx = RT_VALID_PTR(pPtrs) && RT_VALID_PTR(pPtrs->ContextRecord)   ? pPtrs->ContextRecord   : NULL;
+        if (pXcptCtx)
+        {
+#ifdef RT_ARCH_AMD64
+            RTLogLogger(pLogger, NULL, "\ncs:rip=%04x:%016RX64\n", pXcptCtx->SegCs, pXcptCtx->Rip);
+            RTLogLogger(pLogger, NULL, "ss:rsp=%04x:%016RX64 rbp=%016RX64\n", pXcptCtx->SegSs, pXcptCtx->Rsp, pXcptCtx->Rbp);
+            RTLogLogger(pLogger, NULL, "rax=%016RX64 rcx=%016RX64 rdx=%016RX64 rbx=%016RX64\n",
+                        pXcptCtx->Rax, pXcptCtx->Rcx, pXcptCtx->Rdx, pXcptCtx->Rbx);
+            RTLogLogger(pLogger, NULL, "rsi=%016RX64 rdi=%016RX64 rsp=%016RX64 rbp=%016RX64\n",
+                        pXcptCtx->Rsi, pXcptCtx->Rdi, pXcptCtx->Rsp, pXcptCtx->Rbp);
+            RTLogLogger(pLogger, NULL, "r8 =%016RX64 r9 =%016RX64 r10=%016RX64 r11=%016RX64\n",
+                        pXcptCtx->R8,  pXcptCtx->R9,  pXcptCtx->R10, pXcptCtx->R11);
+            RTLogLogger(pLogger, NULL, "r12=%016RX64 r13=%016RX64 r14=%016RX64 r15=%016RX64\n",
+                        pXcptCtx->R12,  pXcptCtx->R13,  pXcptCtx->R14, pXcptCtx->R15);
+            RTLogLogger(pLogger, NULL, "ds=%04x es=%04x fs=%04x gs=%04x eflags=%08x\n",
+                        pXcptCtx->SegDs, pXcptCtx->SegEs, pXcptCtx->SegFs, pXcptCtx->SegGs, pXcptCtx->EFlags);
+            RTLogLogger(pLogger, NULL, "p1home=%016RX64 p2home=%016RX64 pe3home=%016RX64\n",
+                        pXcptCtx->P1Home, pXcptCtx->P2Home, pXcptCtx->P3Home);
+            RTLogLogger(pLogger, NULL, "p4home=%016RX64 p5home=%016RX64 pe6home=%016RX64\n",
+                        pXcptCtx->P4Home, pXcptCtx->P5Home, pXcptCtx->P6Home);
+            RTLogLogger(pLogger, NULL, "   LastBranchToRip=%016RX64    LastBranchFromRip=%016RX64\n",
+                        pXcptCtx->LastBranchToRip, pXcptCtx->LastBranchFromRip);
+            RTLogLogger(pLogger, NULL, "LastExceptionToRip=%016RX64 LastExceptionFromRip=%016RX64\n",
+                        pXcptCtx->LastExceptionToRip, pXcptCtx->LastExceptionFromRip);
+            uXcptSP = pXcptCtx->Rsp;
+            uXcptPC = pXcptCtx->Rip;
+
+#elif defined(RT_ARCH_X86)
+            RTLogLogger(pLogger, NULL, "\ncs:eip=%04x:%08RX32\n", pXcptCtx->SegCs, pXcptCtx->Eip);
+            RTLogLogger(pLogger, NULL, "ss:esp=%04x:%08RX32 ebp=%08RX32\n", pXcptCtx->SegSs, pXcptCtx->Esp, pXcptCtx->Ebp);
+            RTLogLogger(pLogger, NULL, "eax=%08RX32 ecx=%08RX32 edx=%08RX32 ebx=%08RX32\n",
+                        pXcptCtx->Eax, pXcptCtx->Ecx,  pXcptCtx->Edx,  pXcptCtx->Ebx);
+            RTLogLogger(pLogger, NULL, "esi=%08RX32 edi=%08RX32 esp=%08RX32 ebp=%08RX32\n",
+                        pXcptCtx->Esi, pXcptCtx->Edi,  pXcptCtx->Esp,  pXcptCtx->Ebp);
+            RTLogLogger(pLogger, NULL, "ds=%04x es=%04x fs=%04x gs=%04x eflags=%08x\n",
+                        pXcptCtx->SegDs, pXcptCtx->SegEs, pXcptCtx->SegFs, pXcptCtx->SegGs, pXcptCtx->EFlags);
+            uXcptSP = pXcptCtx->Esp;
+            uXcptPC = pXcptCtx->Eip;
+#endif
+        }
+
+        /*
+         * Dump stack.
+         */
+        uintptr_t uStack = (uintptr_t)(void *)&szMarker[0];
+        uStack -= uStack & 15;
+
+        size_t cbToDump = PAGE_SIZE - (uStack & PAGE_OFFSET_MASK);
+        if (cbToDump < 512)
+            cbToDump += PAGE_SIZE;
+        size_t cbToXcpt = uXcptSP - uStack;
+        while (cbToXcpt > cbToDump && cbToXcpt <= _16K)
+            cbToDump += PAGE_SIZE;
+        ULONG_PTR uLow  = (uintptr_t)&szMarker[0];
+        ULONG_PTR uHigh = (uintptr_t)&szMarker[0];
+        if (g_pfnGetCurrentThreadStackLimits)
+        {
+            g_pfnGetCurrentThreadStackLimits(&uLow, &uHigh);
+            size_t cbToTop = RT_MAX(uLow, uHigh) - uStack;
+            if (cbToTop < _1M)
+                cbToDump = cbToTop;
+        }
+
+        RTLogLogger(pLogger, NULL, "\nStack %p, dumping %#x bytes (low=%p, high=%p)\n", uStack, cbToDump, uLow, uHigh);
+        RTLogLogger(pLogger, NULL, "%.*RhxD\n", cbToDump, uStack);
+
+        /*
+         * Try figure the thread name.
+         *
+         * Note! This involves the thread db lock, so it may deadlock, which
+         *       is why it's at the end.
+         */
+        RTLogLogger(pLogger, NULL,  "Thread ID:   %p\n", RTThreadNativeSelf());
+        RTLogLogger(pLogger, NULL,  "Thread name: %s\n", RTThreadSelfName());
+        RTLogLogger(pLogger, NULL,  "Thread IPRT: %p\n", RTThreadSelf());
+
+        /*
+         * Try dump the load information.
+         */
+        PPEB pPeb = RTNtCurrentPeb();
+        if (RT_VALID_PTR(pPeb))
+        {
+            PPEB_LDR_DATA pLdrData = pPeb->Ldr;
+            if (RT_VALID_PTR(pLdrData))
+            {
+                PLDR_DATA_TABLE_ENTRY pFound     = NULL;
+                LIST_ENTRY * const    pList      = &pLdrData->InMemoryOrderModuleList;
+                LIST_ENTRY           *pListEntry = pList->Flink;
+                uint32_t              cLoops     = 0;
+                RTLogLogger(pLogger, NULL,
+                            "\nLoaded Modules:\n"
+                            "%-*s[*] Timestamp Path\n", sizeof(void *) * 4 + 2 - 1, "Address range"
+                            );
+                while (pListEntry != pList && RT_VALID_PTR(pListEntry) && cLoops < 1024)
+                {
+                    PLDR_DATA_TABLE_ENTRY pLdrEntry = RT_FROM_MEMBER(pListEntry, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
+                    uint32_t const        cbLength  = (uint32_t)(uintptr_t)pLdrEntry->Reserved3[1];
+                    char                  chInd     = ' ';
+                    if (uXcptPC - (uintptr_t)pLdrEntry->DllBase < cbLength)
+                    {
+                        chInd = '*';
+                        pFound = pLdrEntry;
+                    }
+
+                    if (   RT_VALID_PTR(pLdrEntry->FullDllName.Buffer)
+                        && pLdrEntry->FullDllName.Length > 0
+                        && pLdrEntry->FullDllName.Length < _8K
+                        && (pLdrEntry->FullDllName.Length & 1) == 0
+                        && pLdrEntry->FullDllName.Length <= pLdrEntry->FullDllName.MaximumLength)
+                        RTLogLogger(pLogger, NULL, "%p..%p%c  %08RX32  %.*ls\n",
+                                    pLdrEntry->DllBase, (uintptr_t)pLdrEntry->DllBase + cbLength - 1, chInd,
+                                    pLdrEntry->TimeDateStamp, pLdrEntry->FullDllName.Length / sizeof(RTUTF16),
+                                    pLdrEntry->FullDllName.Buffer);
+                    else
+                        RTLogLogger(pLogger, NULL, "%p..%p%c  %08RX32  <bad or missing: %p LB %#x max %#x\n",
+                                    pLdrEntry->DllBase, (uintptr_t)pLdrEntry->DllBase + cbLength - 1, chInd,
+                                    pLdrEntry->TimeDateStamp, pLdrEntry->FullDllName.Buffer, pLdrEntry->FullDllName.Length,
+                                    pLdrEntry->FullDllName.MaximumLength);
+
+                    /* advance */
+                    pListEntry = pListEntry->Flink;
+                    cLoops++;
+                }
+
+                /*
+                 * Use the above to pick out code addresses on the stack.
+                 */
+                if (   cLoops < 1024
+                    && uXcptSP - uStack < cbToDump)
+                {
+                    RTLogLogger(pLogger, NULL, "\nPotential code addresses on the stack:\n");
+                    if (pFound)
+                    {
+                        if (   RT_VALID_PTR(pFound->FullDllName.Buffer)
+                            && pFound->FullDllName.Length > 0
+                            && pFound->FullDllName.Length < _8K
+                            && (pFound->FullDllName.Length & 1) == 0
+                            && pFound->FullDllName.Length <= pFound->FullDllName.MaximumLength)
+                            RTLogLogger(pLogger, NULL, "%-*s: %p - %#010RX32 bytes into %.*ls\n",
+                                        sizeof(void *) * 2, "Xcpt PC", uXcptPC, (uint32_t)(uXcptPC - (uintptr_t)pFound->DllBase),
+                                        pFound->FullDllName.Length / sizeof(RTUTF16), pFound->FullDllName.Buffer);
+                        else
+                            RTLogLogger(pLogger, NULL, "%-*s: %p - %08RX32 into module at %p\n",
+                                        sizeof(void *) * 2, "Xcpt PC", uXcptPC, (uint32_t)(uXcptPC - (uintptr_t)pFound->DllBase),
+                                        pFound->DllBase);
+                    }
+
+                    uintptr_t const *puStack = (uintptr_t const *)uXcptSP;
+                    uintptr_t        cLeft   = (cbToDump - (uXcptSP - uStack)) / sizeof(uintptr_t);
+                    while (cLeft-- > 0)
+                    {
+                        uintptr_t uPtr = *puStack;
+                        if (RT_VALID_PTR(uPtr))
+                        {
+                            /* Search the module table. */
+                            pFound     = NULL;
+                            cLoops     = 0;
+                            pListEntry = pList->Flink;
+                            while (pListEntry != pList && RT_VALID_PTR(pListEntry) && cLoops < 1024)
+                            {
+                                PLDR_DATA_TABLE_ENTRY pLdrEntry = RT_FROM_MEMBER(pListEntry, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
+                                uint32_t const        cbLength  = (uint32_t)(uintptr_t)pLdrEntry->Reserved3[1];
+                                if (uPtr - (uintptr_t)pLdrEntry->DllBase < cbLength)
+                                {
+                                    pFound = pLdrEntry;
+                                    break;
+                                }
+
+                                /* advance */
+                                pListEntry = pListEntry->Flink;
+                                cLoops++;
+                            }
+
+                            if (pFound)
+                            {
+                                if (   RT_VALID_PTR(pFound->FullDllName.Buffer)
+                                    && pFound->FullDllName.Length > 0
+                                    && pFound->FullDllName.Length < _8K
+                                    && (pFound->FullDllName.Length & 1) == 0
+                                    && pFound->FullDllName.Length <= pFound->FullDllName.MaximumLength)
+                                    RTLogLogger(pLogger, NULL, "%p: %p - %#010RX32 bytes into %.*ls\n",
+                                                puStack, uPtr, (uint32_t)(uPtr - (uintptr_t)pFound->DllBase),
+                                                pFound->FullDllName.Length / sizeof(RTUTF16), pFound->FullDllName.Buffer);
+                                else
+                                    RTLogLogger(pLogger, NULL, "%p: %p - %08RX32 into module at %p\n",
+                                                puStack, uPtr, (uint32_t)(uPtr - (uintptr_t)pFound->DllBase), pFound->DllBase);
+                            }
+                        }
+
+                        puStack++;
+                    }
+                }
+            }
+        }
+    }
+
+    /*
+     * Do the default stuff, never mind us.
+     */
+    if (g_pfnUnhandledXcptFilter)
+        return g_pfnUnhandledXcptFilter(pPtrs);
+    return EXCEPTION_CONTINUE_SEARCH;
+}
+
diff --git a/src/VBox/Runtime/r3/win/internal-r3-win.h b/src/VBox/Runtime/r3/win/internal-r3-win.h
new file mode 100644
index 00000000..b43d7c14
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/internal-r3-win.h
@@ -0,0 +1,212 @@
+/* $Id: internal-r3-win.h $ */
+/** @file
+ * IPRT - some Windows OS type constants.
+ */
+
+/*
+ * Copyright (C) 2013-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r3_win_internal_r3_win_h
+#define IPRT_INCLUDED_SRC_r3_win_internal_r3_win_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "internal/iprt.h"
+#include <iprt/types.h>
+
+
+/*******************************************************************************
+*   Structures and Typedefs                                                    *
+*******************************************************************************/
+/**
+ * Windows OS type as determined by rtSystemWinOSType().
+ *
+ * @note ASSUMPTIONS are made regarding ordering. Win 9x should come first, then
+ *       NT. The Win9x and NT versions should internally be ordered in ascending
+ *       version/code-base order.
+ */
+typedef enum RTWINOSTYPE
+{
+    kRTWinOSType_UNKNOWN    = 0,
+    kRTWinOSType_9XFIRST    = 1,
+    kRTWinOSType_95         = kRTWinOSType_9XFIRST,
+    kRTWinOSType_95SP1,
+    kRTWinOSType_95OSR2,
+    kRTWinOSType_98,
+    kRTWinOSType_98SP1,
+    kRTWinOSType_98SE,
+    kRTWinOSType_ME,
+    kRTWinOSType_9XLAST     = 99,
+    kRTWinOSType_NTFIRST    = 100,
+    kRTWinOSType_NT310      = kRTWinOSType_NTFIRST,
+    kRTWinOSType_NT350,
+    kRTWinOSType_NT351,
+    kRTWinOSType_NT4,
+    kRTWinOSType_2K,                        /* 5.0 */
+    kRTWinOSType_XP,                        /* 5.1 */
+    kRTWinOSType_XP64,                      /* 5.2, workstation */
+    kRTWinOSType_2003,                      /* 5.2 */
+    kRTWinOSType_VISTA,                     /* 6.0, workstation */
+    kRTWinOSType_2008,                      /* 6.0, server */
+    kRTWinOSType_7,                         /* 6.1, workstation */
+    kRTWinOSType_2008R2,                    /* 6.1, server */
+    kRTWinOSType_8,                         /* 6.2, workstation */
+    kRTWinOSType_2012,                      /* 6.2, server */
+    kRTWinOSType_81,                        /* 6.3, workstation */
+    kRTWinOSType_2012R2,                    /* 6.3, server */
+    kRTWinOSType_10,                        /* 10.0, workstation */
+    kRTWinOSType_2016,                      /* 10.0, server */
+    kRTWinOSType_NT_UNKNOWN = 199,
+    kRTWinOSType_NT_LAST    = kRTWinOSType_UNKNOWN
+} RTWINOSTYPE;
+
+/**
+ * Windows loader protection level.
+ */
+typedef enum RTR3WINLDRPROT
+{
+    RTR3WINLDRPROT_INVALID = 0,
+    RTR3WINLDRPROT_NONE,
+    RTR3WINLDRPROT_NO_CWD,
+    RTR3WINLDRPROT_SAFE,
+    RTR3WINLDRPROT_SAFER
+} RTR3WINLDRPROT;
+
+
+/*******************************************************************************
+*   Global Variables                                                           *
+*******************************************************************************/
+extern DECLHIDDEN(RTR3WINLDRPROT)   g_enmWinLdrProt;
+extern DECLHIDDEN(RTWINOSTYPE)      g_enmWinVer;
+#ifdef _WINDEF_
+extern DECLHIDDEN(OSVERSIONINFOEXW) g_WinOsInfoEx;
+
+extern DECLHIDDEN(HMODULE)                         g_hModKernel32;
+typedef UINT (WINAPI *PFNGETWINSYSDIR)(LPWSTR,UINT);
+extern DECLHIDDEN(PFNGETWINSYSDIR)                 g_pfnGetSystemWindowsDirectoryW;
+extern decltype(SystemTimeToTzSpecificLocalTime)  *g_pfnSystemTimeToTzSpecificLocalTime;
+
+extern DECLHIDDEN(HMODULE)          g_hModNtDll;
+typedef NTSTATUS (NTAPI *PFNNTQUERYFULLATTRIBUTESFILE)(struct _OBJECT_ATTRIBUTES *, struct _FILE_NETWORK_OPEN_INFORMATION *);
+extern DECLHIDDEN(PFNNTQUERYFULLATTRIBUTESFILE) g_pfnNtQueryFullAttributesFile;
+typedef NTSTATUS (NTAPI *PFNNTDUPLICATETOKEN)(HANDLE, ACCESS_MASK, struct _OBJECT_ATTRIBUTES *, BOOLEAN, TOKEN_TYPE, PHANDLE);
+extern DECLHIDDEN(PFNNTDUPLICATETOKEN)             g_pfnNtDuplicateToken;
+#ifdef IPRT_INCLUDED_nt_nt_h
+extern decltype(NtAlertThread)                    *g_pfnNtAlertThread;
+#endif
+
+extern DECLHIDDEN(HMODULE)                         g_hModWinSock;
+
+/** WSAStartup */
+typedef int             (WINAPI *PFNWSASTARTUP)(WORD, struct WSAData *);
+/** WSACleanup */
+typedef int             (WINAPI *PFNWSACLEANUP)(void);
+/** WSAGetLastError */
+typedef int             (WINAPI *PFNWSAGETLASTERROR)(void);
+/** WSASetLastError */
+typedef int             (WINAPI *PFNWSASETLASTERROR)(int);
+/** WSACreateEvent */
+typedef HANDLE          (WINAPI *PFNWSACREATEEVENT)(void);
+/** WSASetEvent */
+typedef BOOL            (WINAPI *PFNWSASETEVENT)(HANDLE);
+/** WSACloseEvent */
+typedef BOOL            (WINAPI *PFNWSACLOSEEVENT)(HANDLE);
+/** WSAEventSelect */
+typedef BOOL            (WINAPI *PFNWSAEVENTSELECT)(UINT_PTR, HANDLE, LONG);
+/** WSAEnumNetworkEvents */
+typedef int             (WINAPI *PFNWSAENUMNETWORKEVENTS)(UINT_PTR, HANDLE, struct _WSANETWORKEVENTS *);
+/** WSASend */
+typedef int             (WINAPI *PFNWSASend)(UINT_PTR, struct _WSABUF *, DWORD, LPDWORD, DWORD dwFlags, struct _OVERLAPPED *, PFNRT /*LPWSAOVERLAPPED_COMPLETION_ROUTINE*/);
+
+/** socket */
+typedef UINT_PTR        (WINAPI *PFNWINSOCKSOCKET)(int, int, int);
+/** closesocket */
+typedef int             (WINAPI *PFNWINSOCKCLOSESOCKET)(UINT_PTR);
+/** recv */
+typedef int             (WINAPI *PFNWINSOCKRECV)(UINT_PTR, char *, int, int);
+/** send */
+typedef int             (WINAPI *PFNWINSOCKSEND)(UINT_PTR, const char *, int, int);
+/** recvfrom */
+typedef int             (WINAPI *PFNWINSOCKRECVFROM)(UINT_PTR, char *, int, int, struct sockaddr *, int *);
+/** sendto */
+typedef int             (WINAPI *PFNWINSOCKSENDTO)(UINT_PTR, const char *, int, int, const struct sockaddr *, int);
+/** bind */
+typedef int             (WINAPI *PFNWINSOCKBIND)(UINT_PTR, const struct sockaddr *, int);
+/** listen  */
+typedef int             (WINAPI *PFNWINSOCKLISTEN)(UINT_PTR, int);
+/** accept */
+typedef UINT_PTR        (WINAPI *PFNWINSOCKACCEPT)(UINT_PTR, struct sockaddr *, int *);
+/** connect */
+typedef int             (WINAPI *PFNWINSOCKCONNECT)(UINT_PTR, const struct sockaddr *, int);
+/** shutdown */
+typedef int             (WINAPI *PFNWINSOCKSHUTDOWN)(UINT_PTR, int);
+/** getsockopt */
+typedef int             (WINAPI *PFNWINSOCKGETSOCKOPT)(UINT_PTR, int, int, char *, int *);
+/** setsockopt */
+typedef int             (WINAPI *PFNWINSOCKSETSOCKOPT)(UINT_PTR, int, int, const char *, int);
+/** ioctlsocket */
+typedef int             (WINAPI *PFNWINSOCKIOCTLSOCKET)(UINT_PTR, long, unsigned long *);
+/** getpeername   */
+typedef int             (WINAPI *PFNWINSOCKGETPEERNAME)(UINT_PTR, struct sockaddr *, int *);
+/** getsockname */
+typedef int             (WINAPI *PFNWINSOCKGETSOCKNAME)(UINT_PTR, struct sockaddr *, int *);
+/** __WSAFDIsSet */
+typedef int             (WINAPI *PFNWINSOCK__WSAFDISSET)(UINT_PTR, struct fd_set *);
+/** select */
+typedef int             (WINAPI *PFNWINSOCKSELECT)(int, struct fd_set *, struct fd_set *, struct fd_set *, const struct timeval *);
+/** gethostbyname */
+typedef struct hostent *(WINAPI *PFNWINSOCKGETHOSTBYNAME)(const char *);
+
+extern DECLHIDDEN(PFNWSASTARTUP)                   g_pfnWSAStartup;
+extern DECLHIDDEN(PFNWSACLEANUP)                   g_pfnWSACleanup;
+extern PFNWSAGETLASTERROR                          g_pfnWSAGetLastError;
+extern PFNWSASETLASTERROR                          g_pfnWSASetLastError;
+extern DECLHIDDEN(PFNWSACREATEEVENT)               g_pfnWSACreateEvent;
+extern DECLHIDDEN(PFNWSACLOSEEVENT)                g_pfnWSACloseEvent;
+extern DECLHIDDEN(PFNWSASETEVENT)                  g_pfnWSASetEvent;
+extern DECLHIDDEN(PFNWSAEVENTSELECT)               g_pfnWSAEventSelect;
+extern DECLHIDDEN(PFNWSAENUMNETWORKEVENTS)         g_pfnWSAEnumNetworkEvents;
+extern DECLHIDDEN(PFNWSASend)                      g_pfnWSASend;
+extern DECLHIDDEN(PFNWINSOCKSOCKET)                g_pfnsocket;
+extern DECLHIDDEN(PFNWINSOCKCLOSESOCKET)           g_pfnclosesocket;
+extern DECLHIDDEN(PFNWINSOCKRECV)                  g_pfnrecv;
+extern DECLHIDDEN(PFNWINSOCKSEND)                  g_pfnsend;
+extern DECLHIDDEN(PFNWINSOCKRECVFROM)              g_pfnrecvfrom;
+extern DECLHIDDEN(PFNWINSOCKSENDTO)                g_pfnsendto;
+extern DECLHIDDEN(PFNWINSOCKBIND)                  g_pfnbind;
+extern DECLHIDDEN(PFNWINSOCKLISTEN)                g_pfnlisten;
+extern DECLHIDDEN(PFNWINSOCKACCEPT)                g_pfnaccept;
+extern DECLHIDDEN(PFNWINSOCKCONNECT)               g_pfnconnect;
+extern DECLHIDDEN(PFNWINSOCKSHUTDOWN)              g_pfnshutdown;
+extern DECLHIDDEN(PFNWINSOCKGETSOCKOPT)            g_pfngetsockopt;
+extern DECLHIDDEN(PFNWINSOCKSETSOCKOPT)            g_pfnsetsockopt;
+extern DECLHIDDEN(PFNWINSOCKIOCTLSOCKET)           g_pfnioctlsocket;
+extern DECLHIDDEN(PFNWINSOCKGETPEERNAME)           g_pfngetpeername;
+extern DECLHIDDEN(PFNWINSOCKGETSOCKNAME)           g_pfngetsockname;
+extern DECLHIDDEN(PFNWINSOCK__WSAFDISSET)          g_pfn__WSAFDIsSet;
+extern DECLHIDDEN(PFNWINSOCKSELECT)                g_pfnselect;
+extern DECLHIDDEN(PFNWINSOCKGETHOSTBYNAME)         g_pfngethostbyname;
+#endif
+
+
+#endif /* !IPRT_INCLUDED_SRC_r3_win_internal_r3_win_h */
+
diff --git a/src/VBox/Runtime/r3/win/krnlmod-win.cpp b/src/VBox/Runtime/r3/win/krnlmod-win.cpp
new file mode 100644
index 00000000..e85d681b
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/krnlmod-win.cpp
@@ -0,0 +1,297 @@
+/* $Id: krnlmod-win.cpp $ */
+/** @file
+ * IPRT - Kernel module, Windows.
+ */
+
+/*
+ * Copyright (C) 2017-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SYSTEM
+#include <iprt/nt/nt.h>
+
+#include <iprt/krnlmod.h>
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/dir.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/types.h>
+
+
+/**
+ * Internal kernel information record state.
+ */
+typedef struct RTKRNLMODINFOINT
+{
+    /** Reference counter. */
+    volatile uint32_t   cRefs;
+    /** Reference count for the kernel module. */
+    uint32_t            cRefKrnlMod;
+    /** Load address of the kernel module. */
+    RTR0UINTPTR         uLoadAddr;
+    /** Size of the kernel module. */
+    size_t              cbKrnlMod;
+    /** Pointer to the driver name. */
+    const char          *pszName;
+    /** Size of the name in characters including the zero terminator. */
+    size_t              cchFilePath;
+    /** Module name - variable in size. */
+    char                achFilePath[1];
+} RTKRNLMODINFOINT;
+/** Pointer to the internal kernel module information record. */
+typedef RTKRNLMODINFOINT *PRTKRNLMODINFOINT;
+/** Pointer to a const internal kernel module information record. */
+typedef const RTKRNLMODINFOINT *PCRTKRNLMODINFOINT;
+
+
+/**
+ * Destroy the given kernel module information record.
+ *
+ * @returns nothing.
+ * @param   pThis            The record to destroy.
+ */
+static void rtKrnlModInfoDestroy(PRTKRNLMODINFOINT pThis)
+{
+    RTMemFree(pThis);
+}
+
+
+/**
+ * Queries the complete kernel modules structure and returns a pointer to it.
+ *
+ * @returns IPRT status code.
+ * @param   ppKrnlMods       Where to store the pointer to the kernel module list on success.
+ *                           Free with RTMemFree().
+ */
+static int rtKrnlModWinQueryKrnlMods(PRTL_PROCESS_MODULES *ppKrnlMods)
+{
+    int rc = VINF_SUCCESS;
+    RTL_PROCESS_MODULES KrnlModsSize;
+
+    NTSTATUS rcNt = NtQuerySystemInformation(SystemModuleInformation, &KrnlModsSize, sizeof(KrnlModsSize), NULL);
+    if (NT_SUCCESS(rcNt) || rcNt == STATUS_INFO_LENGTH_MISMATCH)
+    {
+        ULONG cbKrnlMods = RT_UOFFSETOF_DYN(RTL_PROCESS_MODULES, Modules[KrnlModsSize.NumberOfModules]);
+        PRTL_PROCESS_MODULES pKrnlMods = (PRTL_PROCESS_MODULES)RTMemAllocZ(cbKrnlMods);
+        if (RT_LIKELY(pKrnlMods))
+        {
+            rcNt = NtQuerySystemInformation(SystemModuleInformation, pKrnlMods, cbKrnlMods, NULL);
+            if (NT_SUCCESS(rcNt))
+                *ppKrnlMods = pKrnlMods;
+            else
+                rc = RTErrConvertFromNtStatus(rcNt);
+        }
+        else
+            rc = VERR_NO_MEMORY;
+    }
+    else
+        rc = RTErrConvertFromNtStatus(rcNt);
+
+    return rc;
+}
+
+/**
+ * Creates a new kernel module information record for the given module.
+ *
+ * @returns IPRT status code.
+ * @param   pModInfo         The kernel module information.
+ * @param   phKrnlModInfo    Where to store the handle to the kernel module information record
+ *                           on success.
+ */
+static int rtKrnlModWinInfoCreate(PRTL_PROCESS_MODULE_INFORMATION pModInfo, PRTKRNLMODINFO phKrnlModInfo)
+{
+    int rc = VINF_SUCCESS;
+    RT_NOREF2(pModInfo, phKrnlModInfo);
+    size_t cchFilePath = strlen((const char *)&pModInfo->FullPathName[0]) + 1;
+    PRTKRNLMODINFOINT pThis = (PRTKRNLMODINFOINT)RTMemAllocZ(RT_UOFFSETOF_DYN(RTKRNLMODINFOINT, achFilePath[cchFilePath]));
+    if (RT_LIKELY(pThis))
+    {
+        memcpy(&pThis->achFilePath[0], &pModInfo->FullPathName[0], cchFilePath);
+        pThis->cchFilePath = cchFilePath;
+        pThis->cRefs       = 1;
+        pThis->cbKrnlMod   = pModInfo->ImageSize;
+        pThis->uLoadAddr   = (RTR0UINTPTR)pModInfo->ImageBase;
+        pThis->pszName     =   pModInfo->OffsetToFileName >= cchFilePath
+                             ? NULL
+                             : pThis->achFilePath + pModInfo->OffsetToFileName;
+
+        *phKrnlModInfo = pThis;
+    }
+    else
+        rc = VERR_NO_MEMORY;
+
+    return rc;
+}
+
+
+RTDECL(int) RTKrnlModQueryLoaded(const char *pszName, bool *pfLoaded)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertPtrReturn(pfLoaded, VERR_INVALID_POINTER);
+
+    int rc = VERR_NOT_IMPLEMENTED;
+
+    return rc;
+}
+
+
+RTDECL(int) RTKrnlModLoadedQueryInfo(const char *pszName, PRTKRNLMODINFO phKrnlModInfo)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertPtrReturn(phKrnlModInfo, VERR_INVALID_POINTER);
+
+    int rc = VERR_NOT_IMPLEMENTED;
+
+    return rc;
+}
+
+
+RTDECL(uint32_t) RTKrnlModLoadedGetCount(void)
+{
+    uint32_t cKrnlMods = 0;
+    RTL_PROCESS_MODULES ProcMods;
+
+    NTSTATUS rcNt = NtQuerySystemInformation(SystemModuleInformation, &ProcMods, sizeof(ProcMods), NULL);
+    if (NT_SUCCESS(rcNt) || rcNt == STATUS_INFO_LENGTH_MISMATCH)
+        cKrnlMods = ProcMods.NumberOfModules;
+
+    return cKrnlMods;
+}
+
+
+RTDECL(int) RTKrnlModLoadedQueryInfoAll(PRTKRNLMODINFO pahKrnlModInfo, uint32_t cEntriesMax,
+                                        uint32_t *pcEntries)
+{
+    AssertReturn(VALID_PTR(pahKrnlModInfo) || cEntriesMax == 0, VERR_INVALID_PARAMETER);
+
+    PRTL_PROCESS_MODULES pKrnlMods = NULL;
+    int rc = rtKrnlModWinQueryKrnlMods(&pKrnlMods);
+    if (RT_SUCCESS(rc))
+    {
+        if (pKrnlMods->NumberOfModules <= cEntriesMax)
+        {
+            for (unsigned i = 0; i < pKrnlMods->NumberOfModules; i++)
+            {
+                pKrnlMods->Modules[i].FullPathName[255] = '\0'; /* Paranoia */
+                rc = rtKrnlModWinInfoCreate(&pKrnlMods->Modules[i], &pahKrnlModInfo[i]);
+                if (RT_FAILURE(rc))
+                {
+                    while (i-- > 0)
+                        RTKrnlModInfoRelease(pahKrnlModInfo[i]);
+                    break;
+                }
+            }
+        }
+        else
+            rc = VERR_BUFFER_OVERFLOW;
+
+        if (pcEntries)
+            *pcEntries = pKrnlMods->NumberOfModules;
+
+        RTMemFree(pKrnlMods);
+    }
+
+    return rc;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoRetain(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, UINT32_MAX);
+
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
+    return cRefs;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoRelease(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    if (!pThis)
+        return 0;
+    AssertPtrReturn(pThis, UINT32_MAX);
+
+    uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
+    if (cRefs == 0)
+        rtKrnlModInfoDestroy(pThis);
+    return cRefs;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoGetRefCnt(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, 0);
+
+    return pThis->cRefKrnlMod;
+}
+
+
+RTDECL(const char *) RTKrnlModInfoGetName(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, NULL);
+
+    return pThis->pszName;
+}
+
+
+RTDECL(const char *) RTKrnlModInfoGetFilePath(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, NULL);
+
+    return &pThis->achFilePath[0];
+}
+
+
+RTDECL(size_t) RTKrnlModInfoGetSize(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, 0);
+
+    return pThis->cbKrnlMod;
+}
+
+
+RTDECL(RTR0UINTPTR) RTKrnlModInfoGetLoadAddr(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, 0);
+
+    return pThis->uLoadAddr;
+}
+
+
+RTDECL(int) RTKrnlModInfoQueryRefModInfo(RTKRNLMODINFO hKrnlModInfo, uint32_t idx,
+                                         PRTKRNLMODINFO phKrnlModInfoRef)
+{
+    RT_NOREF3(hKrnlModInfo, idx, phKrnlModInfoRef);
+    return VERR_NOT_SUPPORTED;
+}
diff --git a/src/VBox/Runtime/r3/win/ldrNative-win.cpp b/src/VBox/Runtime/r3/win/ldrNative-win.cpp
new file mode 100644
index 00000000..5175a03f
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/ldrNative-win.cpp
@@ -0,0 +1,316 @@
+/* $Id: ldrNative-win.cpp $ */
+/** @file
+ * IPRT - Binary Image Loader, Win32 native.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_LDR
+#include <iprt/nt/nt-and-windows.h>
+
+#include <iprt/ldr.h>
+#include "internal/iprt.h"
+
+#include <iprt/alloca.h>
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/log.h>
+#include <iprt/once.h>
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+
+#include "internal/ldr.h"
+#include "internal-r3-win.h"
+
+#ifndef LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR
+# define LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR       UINT32_C(0x100)
+# define LOAD_LIBRARY_SEARCH_APPLICATION_DIR    UINT32_C(0x200)
+# define LOAD_LIBRARY_SEARCH_SYSTEM32           UINT32_C(0x800)
+#endif
+
+
+DECLHIDDEN(int) rtldrNativeLoad(const char *pszFilename, uintptr_t *phHandle, uint32_t fFlags, PRTERRINFO pErrInfo)
+{
+    Assert(sizeof(*phHandle) >= sizeof(HMODULE));
+    AssertReturn(!(fFlags & RTLDRLOAD_FLAGS_GLOBAL), VERR_INVALID_FLAGS);
+    AssertLogRelMsgReturn(RTPathStartsWithRoot(pszFilename),  /* Relative names will still be applied to the search path. */
+                          ("pszFilename='%s'\n", pszFilename),
+                          VERR_INTERNAL_ERROR_2);
+    AssertReleaseMsg(g_hModKernel32,
+                     ("rtldrNativeLoad(%s,,) is called before IPRT has configured the windows loader!\n", pszFilename));
+
+    /*
+     * Convert to UTF-16 and make sure it got a .DLL suffix.
+     */
+    /** @todo Implement long path support for native DLL loading on windows. @bugref{9248} */
+    int rc;
+    RTUTF16 *pwszNative = NULL;
+    if (RTPathHasSuffix(pszFilename) || (fFlags & RTLDRLOAD_FLAGS_NO_SUFFIX))
+        rc = RTStrToUtf16(pszFilename, &pwszNative);
+    else
+    {
+        size_t cwcAlloc;
+        rc = RTStrCalcUtf16LenEx(pszFilename, RTSTR_MAX, &cwcAlloc);
+        if (RT_SUCCESS(rc))
+        {
+            cwcAlloc += sizeof(".DLL");
+            pwszNative = RTUtf16Alloc(cwcAlloc * sizeof(RTUTF16));
+            if (pwszNative)
+            {
+                size_t cwcNative;
+                rc = RTStrToUtf16Ex(pszFilename, RTSTR_MAX, &pwszNative, cwcAlloc, &cwcNative);
+                if (RT_SUCCESS(rc))
+                    rc = RTUtf16CopyAscii(&pwszNative[cwcNative], cwcAlloc - cwcNative, ".DLL");
+            }
+            else
+                rc = VERR_NO_UTF16_MEMORY;
+        }
+    }
+    if (RT_SUCCESS(rc))
+    {
+        /* Convert slashes just to be on the safe side. */
+        for (size_t off = 0;; off++)
+        {
+            RTUTF16 wc = pwszNative[off];
+            if (wc == '/')
+                pwszNative[off] = '\\';
+            else if (!wc)
+                break;
+        }
+
+        /*
+         * Attempt load.
+         */
+        HMODULE     hmod;
+        static int  s_iSearchDllLoadDirSupported = 0;
+        if (   !(fFlags & RTLDRLOAD_FLAGS_NT_SEARCH_DLL_LOAD_DIR)
+            || s_iSearchDllLoadDirSupported < 0)
+            hmod = LoadLibraryExW(pwszNative, NULL, 0);
+        else
+        {
+            hmod = LoadLibraryExW(pwszNative, NULL, LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32
+                                  | LOAD_LIBRARY_SEARCH_APPLICATION_DIR);
+            if (s_iSearchDllLoadDirSupported == 0)
+            {
+                if (hmod != NULL || GetLastError() != ERROR_INVALID_PARAMETER)
+                    s_iSearchDllLoadDirSupported = 1;
+                else
+                {
+                    s_iSearchDllLoadDirSupported = -1;
+                    hmod = LoadLibraryExW(pwszNative, NULL, 0);
+                }
+            }
+        }
+        if (hmod)
+        {
+            *phHandle = (uintptr_t)hmod;
+            RTUtf16Free(pwszNative);
+            return VINF_SUCCESS;
+        }
+
+        /*
+         * Try figure why it failed to load.
+         */
+        DWORD dwErr = GetLastError();
+        rc = RTErrConvertFromWin32(dwErr);
+        rc = RTErrInfoSetF(pErrInfo, rc, "GetLastError=%u", dwErr);
+    }
+    else
+        rc = RTErrInfoSetF(pErrInfo, rc, "Error converting UTF-8 to UTF-16 string.");
+    RTUtf16Free(pwszNative);
+    return rc;
+}
+
+
+DECLCALLBACK(int) rtldrNativeGetSymbol(PRTLDRMODINTERNAL pMod, const char *pszSymbol, void **ppvValue)
+{
+    PRTLDRMODNATIVE pModNative = (PRTLDRMODNATIVE)pMod;
+    FARPROC pfn = GetProcAddress((HMODULE)pModNative->hNative, pszSymbol);
+    if (pfn)
+    {
+        *ppvValue = (void *)pfn;
+        return VINF_SUCCESS;
+    }
+    *ppvValue = NULL;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+DECLCALLBACK(int) rtldrNativeClose(PRTLDRMODINTERNAL pMod)
+{
+    PRTLDRMODNATIVE pModNative = (PRTLDRMODNATIVE)pMod;
+    if (   (pModNative->fFlags & RTLDRLOAD_FLAGS_NO_UNLOAD)
+        || FreeLibrary((HMODULE)pModNative->hNative))
+    {
+        pModNative->hNative = (uintptr_t)INVALID_HANDLE_VALUE;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+DECLHIDDEN(int) rtldrNativeLoadSystem(const char *pszFilename, const char *pszExt, uint32_t fFlags, PRTLDRMOD phLdrMod)
+{
+    AssertReleaseMsg(g_hModKernel32,
+                     ("rtldrNativeLoadSystem(%s,,) is called before IPRT has configured the windows loader!\n", pszFilename));
+
+    /*
+     * Resolve side-by-side resolver API.
+     */
+    static bool volatile s_fInitialized = false;
+    static decltype(RtlDosApplyFileIsolationRedirection_Ustr) *s_pfnApplyRedir = NULL;
+    if (!s_fInitialized)
+    {
+        s_pfnApplyRedir = (decltype(s_pfnApplyRedir))GetProcAddress(g_hModNtDll,
+                                                                    "RtlDosApplyFileIsolationRedirection_Ustr");
+        ASMCompilerBarrier();
+        s_fInitialized = true;
+    }
+
+    /*
+     * We try WinSxS via undocumented NTDLL API and flal back on the System32
+     * directory. No other locations are supported.
+     */
+    int rc = VERR_TRY_AGAIN;
+    char  szPath[RTPATH_MAX];
+    char *pszPath = szPath;
+
+    /* Get the windows system32 directory so we can sanity check the WinSxS result. */
+    WCHAR wszSysDir[MAX_PATH];
+    UINT cwcSysDir = GetSystemDirectoryW(wszSysDir, MAX_PATH);
+    if (cwcSysDir >= MAX_PATH)
+        return VERR_FILENAME_TOO_LONG;
+
+    /* Try side-by-side first (see COMCTL32.DLL). */
+    if (s_pfnApplyRedir)
+    {
+        size_t   cwcName = 0;
+        RTUTF16  wszName[MAX_PATH];
+        PRTUTF16 pwszName = wszName;
+        int rc2 = RTStrToUtf16Ex(pszFilename, RTSTR_MAX, &pwszName, RT_ELEMENTS(wszName), &cwcName);
+        if (RT_SUCCESS(rc2))
+        {
+            static UNICODE_STRING const s_DefaultSuffix = RTNT_CONSTANT_UNISTR(L".dll");
+            WCHAR           wszPath[MAX_PATH];
+            UNICODE_STRING  UniStrStatic   = { 0, (USHORT)sizeof(wszPath) - sizeof(WCHAR), wszPath };
+            UNICODE_STRING  UniStrDynamic  = { 0, 0, NULL };
+            PUNICODE_STRING pUniStrResult  = NULL;
+            UNICODE_STRING  UniStrName     =
+            { (USHORT)(cwcName * sizeof(RTUTF16)), (USHORT)((cwcName + 1) * sizeof(RTUTF16)), wszName };
+
+            NTSTATUS rcNt = s_pfnApplyRedir(1 /*fFlags*/,
+                                            &UniStrName,
+                                            (PUNICODE_STRING)&s_DefaultSuffix,
+                                            &UniStrStatic,
+                                            &UniStrDynamic,
+                                            &pUniStrResult,
+                                            NULL /*pNewFlags*/,
+                                            NULL /*pcbFilename*/,
+                                            NULL /*pcbNeeded*/);
+            if (NT_SUCCESS(rcNt))
+            {
+                /*
+                 * Check that the resolved path has similarities to the
+                 * system directory.
+                 *
+                 * ASSUMES the windows directory is a root directory and
+                 * that both System32 and are on the same level.  So, we'll
+                 * have 2 matching components (or more if the resolver
+                 * returns a system32 path for some reason).
+                 */
+                unsigned cMatchingComponents = 0;
+                size_t   off = 0;
+                while (off < pUniStrResult->Length)
+                {
+                    RTUTF16 wc1 = wszSysDir[off];
+                    RTUTF16 wc2 = pUniStrResult->Buffer[off];
+                    if (!RTPATH_IS_SLASH(wc1))
+                    {
+                        if (wc1 == wc2)
+                            off++;
+                        else if (   wc1 < 127
+                                 && wc2 < 127
+                                 && RT_C_TO_LOWER(wc1) == RT_C_TO_LOWER(wc2) )
+                            off++;
+                        else
+                            break;
+                    }
+                    else if (RTPATH_IS_SLASH(wc2))
+                    {
+                        cMatchingComponents += off > 0;
+                        do
+                            off++;
+                        while (   off < pUniStrResult->Length
+                               && RTPATH_IS_SLASH(wszSysDir[off])
+                               && RTPATH_IS_SLASH(pUniStrResult->Buffer[off]));
+                    }
+                    else
+                        break;
+                }
+                if (cMatchingComponents >= 2)
+                {
+                    pszPath = szPath;
+                    rc2 = RTUtf16ToUtf8Ex(pUniStrResult->Buffer, pUniStrResult->Length / sizeof(RTUTF16),
+                                          &pszPath, sizeof(szPath), NULL);
+                    if (RT_SUCCESS(rc2))
+                        rc = VINF_SUCCESS;
+                }
+                else
+                    AssertMsgFailed(("%s -> '%*.ls'\n", pszFilename, pUniStrResult->Length, pUniStrResult->Buffer));
+                RtlFreeUnicodeString(&UniStrDynamic);
+            }
+        }
+        else
+            AssertMsgFailed(("%Rrc\n", rc));
+    }
+
+    /* If the above didn't succeed, create a system32 path. */
+    if (RT_FAILURE(rc))
+    {
+        rc = RTUtf16ToUtf8Ex(wszSysDir, RTSTR_MAX, &pszPath, sizeof(szPath), NULL);
+        if (RT_SUCCESS(rc))
+        {
+            rc = RTPathAppend(szPath, sizeof(szPath), pszFilename);
+            if (pszExt && RT_SUCCESS(rc))
+                rc = RTStrCat(szPath, sizeof(szPath), pszExt);
+        }
+    }
+
+    /* Do the actual loading, if we were successful constructing a name. */
+    if (RT_SUCCESS(rc))
+    {
+        if (RTFileExists(szPath))
+            rc = RTLdrLoadEx(szPath, phLdrMod, fFlags, NULL);
+        else
+            rc = VERR_MODULE_NOT_FOUND;
+    }
+
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/localipc-win.cpp b/src/VBox/Runtime/r3/win/localipc-win.cpp
new file mode 100644
index 00000000..31bcc382
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/localipc-win.cpp
@@ -0,0 +1,1648 @@
+/* $Id: localipc-win.cpp $ */
+/** @file
+ * IPRT - Local IPC, Windows Implementation Using Named Pipes.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_LOCALIPC
+/*
+ * We have to force NT 5.0 here because of
+ * ConvertStringSecurityDescriptorToSecurityDescriptor. Note that because of
+ * FILE_FLAG_FIRST_PIPE_INSTANCE this code actually requires W2K SP2+.
+ */
+#ifndef _WIN32_WINNT
+# define _WIN32_WINNT 0x0500 /* for ConvertStringSecurityDescriptorToSecurityDescriptor */
+#elif _WIN32_WINNT < 0x0500
+# undef _WIN32_WINNT
+# define _WIN32_WINNT 0x0500
+#endif
+#define UNICODE    /* For the SDDL_ strings. */
+#include <iprt/win/windows.h>
+#include <sddl.h>
+
+#include "internal/iprt.h"
+#include <iprt/localipc.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/critsect.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/ldr.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+#include <iprt/utf16.h>
+
+#include "internal/magics.h"
+#include "internal-r3-win.h"
+
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Pipe prefix string. */
+#define RTLOCALIPC_WIN_PREFIX   L"\\\\.\\pipe\\IPRT-"
+
+/** DACL for block all network access and local users other than the creator/owner.
+ *
+ * ACE format: (ace_type;ace_flags;rights;object_guid;inherit_object_guid;account_sid)
+ *
+ * Note! FILE_GENERIC_WRITE (SDDL_FILE_WRITE) is evil here because it includes
+ *       the FILE_CREATE_PIPE_INSTANCE(=FILE_APPEND_DATA) flag. Thus the hardcoded
+ *       value 0x0012019b in the client ACE. The server-side still needs
+ *       setting FILE_CREATE_PIPE_INSTANCE although.
+ *       It expands to:
+ *          0x00000001 - FILE_READ_DATA
+ *          0x00000008 - FILE_READ_EA
+ *          0x00000080 - FILE_READ_ATTRIBUTES
+ *          0x00020000 - READ_CONTROL
+ *          0x00100000 - SYNCHRONIZE
+ *          0x00000002 - FILE_WRITE_DATA
+ *          0x00000010 - FILE_WRITE_EA
+ *          0x00000100 - FILE_WRITE_ATTRIBUTES
+ *       =  0x0012019b (client)
+ *       + (only for server):
+ *          0x00000004 - FILE_CREATE_PIPE_INSTANCE
+ *       =  0x0012019f
+ *
+ * @todo Triple check this!
+ * @todo EVERYONE -> AUTHENTICATED USERS or something more appropriate?
+ * @todo Have trouble allowing the owner FILE_CREATE_PIPE_INSTANCE access, so for now I'm hacking
+ *       it just to get progress - the service runs as local system.
+ *       The CREATOR OWNER and PERSONAL SELF works (the former is only involved in inheriting
+ *       it seems, which is why it won't work. The latter I've no idea about. Perhaps the solution
+ *       is to go the annoying route of OpenProcessToken, QueryTokenInformation,
+ *          ConvertSidToStringSid and then use the result... Suggestions are very welcome
+ */
+#define RTLOCALIPC_WIN_SDDL_BASE \
+        SDDL_DACL SDDL_DELIMINATOR \
+        SDDL_ACE_BEGIN SDDL_ACCESS_DENIED L";;" SDDL_GENERIC_ALL L";;;" SDDL_NETWORK SDDL_ACE_END \
+        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";;" SDDL_FILE_ALL   L";;;" SDDL_LOCAL_SYSTEM SDDL_ACE_END
+
+#define RTLOCALIPC_WIN_SDDL_SERVER \
+        RTLOCALIPC_WIN_SDDL_BASE \
+        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";;" L"0x0012019f"   L";;;" SDDL_EVERYONE SDDL_ACE_END
+
+#define RTLOCALIPC_WIN_SDDL_CLIENT \
+        RTLOCALIPC_WIN_SDDL_BASE \
+        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";;" L"0x0012019b"   L";;;" SDDL_EVERYONE SDDL_ACE_END
+
+//        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";;" SDDL_GENERIC_ALL L";;;" SDDL_PERSONAL_SELF SDDL_ACE_END \
+//        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";CIOI;" SDDL_GENERIC_ALL L";;;" SDDL_CREATOR_OWNER SDDL_ACE_END
+//        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";;" L"0x0012019b"    L";;;" SDDL_EVERYONE SDDL_ACE_END
+//        SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED L";;" SDDL_FILE_ALL L";;;" SDDL_LOCAL_SYSTEM SDDL_ACE_END
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Local IPC service instance, Windows.
+ */
+typedef struct RTLOCALIPCSERVERINT
+{
+    /** The magic (RTLOCALIPCSERVER_MAGIC). */
+    uint32_t u32Magic;
+    /** The creation flags. */
+    uint32_t fFlags;
+    /** Critical section protecting the structure. */
+    RTCRITSECT CritSect;
+    /** The number of references to the instance.
+     * @remarks The reference counting isn't race proof. */
+    uint32_t volatile cRefs;
+    /** Indicates that there is a pending cancel request. */
+    bool volatile fCancelled;
+    /** The named pipe handle. */
+    HANDLE hNmPipe;
+    /** The handle to the event object we're using for overlapped I/O. */
+    HANDLE hEvent;
+    /** The overlapped I/O structure. */
+    OVERLAPPED OverlappedIO;
+    /** The full pipe name (variable length). */
+    RTUTF16 wszName[1];
+} RTLOCALIPCSERVERINT;
+/** Pointer to a local IPC server instance (Windows). */
+typedef RTLOCALIPCSERVERINT *PRTLOCALIPCSERVERINT;
+
+
+/**
+ * Local IPC session instance, Windows.
+ *
+ * This is a named pipe and we should probably merge the pipe code with this to
+ * save work and code duplication.
+ */
+typedef struct RTLOCALIPCSESSIONINT
+{
+    /** The magic (RTLOCALIPCSESSION_MAGIC). */
+    uint32_t            u32Magic;
+    /** Critical section protecting the structure. */
+    RTCRITSECT          CritSect;
+    /** The number of references to the instance.
+     * @remarks The reference counting isn't race proof. */
+    uint32_t volatile   cRefs;
+    /** Set if the zero byte read that the poll code using is pending. */
+    bool                fZeroByteRead;
+    /** Indicates that there is a pending cancel request. */
+    bool volatile       fCancelled;
+    /** Set if this is the server side, clear if the client. */
+    bool                fServerSide;
+    /** The named pipe handle. */
+    HANDLE              hNmPipe;
+    struct
+    {
+        RTTHREAD        hActiveThread;
+        /** The handle to the event object we're using for overlapped I/O. */
+        HANDLE          hEvent;
+        /** The overlapped I/O structure. */
+        OVERLAPPED      OverlappedIO;
+    }
+    /** Overlapped reads. */
+                        Read,
+    /** Overlapped writes. */
+                        Write;
+#if 0 /* Non-blocking writes are not yet supported. */
+    /** Bounce buffer for writes. */
+    uint8_t            *pbBounceBuf;
+    /** Amount of used buffer space. */
+    size_t              cbBounceBufUsed;
+    /** Amount of allocated buffer space. */
+    size_t              cbBounceBufAlloc;
+#endif
+    /** Buffer for the zero byte read.
+     * Used in RTLocalIpcSessionWaitForData(). */
+    uint8_t             abBuf[8];
+} RTLOCALIPCSESSIONINT;
+/** Pointer to a local IPC session instance (Windows). */
+typedef RTLOCALIPCSESSIONINT *PRTLOCALIPCSESSIONINT;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int rtLocalIpcWinCreateSession(PRTLOCALIPCSESSIONINT *ppSession, HANDLE hNmPipeSession);
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static bool volatile g_fResolvedApis = false;
+/** advapi32.dll API ConvertStringSecurityDescriptorToSecurityDescriptorW. */
+static decltype(ConvertStringSecurityDescriptorToSecurityDescriptorW) *g_pfnSSDLToSecDescW = NULL;
+
+
+/**
+ * Builds and allocates the security descriptor required for securing the local pipe.
+ *
+ * @return  IPRT status code.
+ * @param   ppDesc              Where to store the allocated security descriptor on success.
+ *                              Must be free'd using LocalFree().
+ * @param   fServer             Whether it's for a server or client instance.
+ */
+static int rtLocalIpcServerWinAllocSecurityDescriptior(PSECURITY_DESCRIPTOR *ppDesc, bool fServer)
+{
+    /*
+     * Resolve the API the first time around.
+     */
+    if (!g_fResolvedApis)
+    {
+        g_pfnSSDLToSecDescW = (decltype(g_pfnSSDLToSecDescW))RTLdrGetSystemSymbol("advapi32.dll", "ConvertStringSecurityDescriptorToSecurityDescriptorW");
+        ASMCompilerBarrier();
+        g_fResolvedApis = true;
+    }
+
+    int rc;
+    PSECURITY_DESCRIPTOR pSecDesc = NULL;
+    if (g_pfnSSDLToSecDescW)
+    {
+        /*
+         * We'll create a security descriptor from a SDDL that denies
+         * access to network clients (this is local IPC after all), it
+         * makes some further restrictions to prevent non-authenticated
+         * users from screwing around.
+         */
+        PCRTUTF16 pwszSDDL = fServer ? RTLOCALIPC_WIN_SDDL_SERVER : RTLOCALIPC_WIN_SDDL_CLIENT;
+        if (g_pfnSSDLToSecDescW(pwszSDDL, SDDL_REVISION_1, &pSecDesc, NULL))
+        {
+            AssertPtr(pSecDesc);
+            *ppDesc = pSecDesc;
+            return VINF_SUCCESS;
+        }
+
+        rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+    {
+        /* Windows OSes < W2K SP2 not supported for now, bail out. */
+        /** @todo Implement me! */
+        rc = VERR_NOT_SUPPORTED;
+    }
+    return rc;
+}
+
+
+/**
+ * Creates a named pipe instance.
+ *
+ * This is used by both RTLocalIpcServerCreate and RTLocalIpcServerListen.
+ *
+ * @return  IPRT status code.
+ * @param   phNmPipe        Where to store the named pipe handle on success.
+ *                          This will be set to INVALID_HANDLE_VALUE on failure.
+ * @param   pwszPipeName    The named pipe name, full, UTF-16 encoded.
+ * @param   fFirst          Set on the first call (from RTLocalIpcServerCreate),
+ *                          otherwise clear. Governs the
+ *                          FILE_FLAG_FIRST_PIPE_INSTANCE flag.
+ */
+static int rtLocalIpcServerWinCreatePipeInstance(PHANDLE phNmPipe, PCRTUTF16 pwszPipeName, bool fFirst)
+{
+    *phNmPipe = INVALID_HANDLE_VALUE;
+
+    PSECURITY_DESCRIPTOR pSecDesc;
+    int rc = rtLocalIpcServerWinAllocSecurityDescriptior(&pSecDesc, fFirst /* Server? */);
+    if (RT_SUCCESS(rc))
+    {
+        SECURITY_ATTRIBUTES SecAttrs;
+        SecAttrs.nLength              = sizeof(SECURITY_ATTRIBUTES);
+        SecAttrs.lpSecurityDescriptor = pSecDesc;
+        SecAttrs.bInheritHandle       = FALSE;
+
+        DWORD fOpenMode = PIPE_ACCESS_DUPLEX
+                        | PIPE_WAIT
+                        | FILE_FLAG_OVERLAPPED;
+        if (   fFirst
+            && (   g_enmWinVer >= kRTWinOSType_XP
+                || (   g_enmWinVer == kRTWinOSType_2K
+                    && g_WinOsInfoEx.wServicePackMajor >= 2) ) )
+            fOpenMode |= FILE_FLAG_FIRST_PIPE_INSTANCE; /* Introduced with W2K SP2 */
+
+        HANDLE hNmPipe = CreateNamedPipeW(pwszPipeName,                  /* lpName */
+                                          fOpenMode,                     /* dwOpenMode */
+                                          PIPE_TYPE_BYTE,                /* dwPipeMode */
+                                          PIPE_UNLIMITED_INSTANCES,      /* nMaxInstances */
+                                          PAGE_SIZE,                     /* nOutBufferSize (advisory) */
+                                          PAGE_SIZE,                     /* nInBufferSize (ditto) */
+                                          30*1000,                       /* nDefaultTimeOut = 30 sec */
+                                          &SecAttrs);                    /* lpSecurityAttributes */
+        LocalFree(pSecDesc);
+        if (hNmPipe != INVALID_HANDLE_VALUE)
+            *phNmPipe = hNmPipe;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+
+    return rc;
+}
+
+
+/**
+ * Validates the user specified name.
+ *
+ * @returns IPRT status code.
+ * @param   pszName         The name to validate.
+ * @param   pcwcFullName    Where to return the UTF-16 length of the full name.
+ * @param   fNative         Whether it's a native name or a portable name.
+ */
+static int rtLocalIpcWinValidateName(const char *pszName, size_t *pcwcFullName, bool fNative)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertReturn(*pszName, VERR_INVALID_NAME);
+
+    if (!fNative)
+    {
+        size_t cwcName = RT_ELEMENTS(RTLOCALIPC_WIN_PREFIX) - 1;
+        for (;;)
+        {
+            char ch = *pszName++;
+            if (!ch)
+                break;
+            AssertReturn(!RT_C_IS_CNTRL(ch), VERR_INVALID_NAME);
+            AssertReturn((unsigned)ch < 0x80, VERR_INVALID_NAME);
+            AssertReturn(ch != '\\', VERR_INVALID_NAME);
+            AssertReturn(ch != '/', VERR_INVALID_NAME);
+            cwcName++;
+        }
+        *pcwcFullName = cwcName;
+    }
+    else
+    {
+        int rc = RTStrCalcUtf16LenEx(pszName, RTSTR_MAX, pcwcFullName);
+        AssertRCReturn(rc, rc);
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Constructs the full pipe name as UTF-16.
+ *
+ * @returns IPRT status code.
+ * @param   pszName         The user supplied name.  ASSUMES reasonable length
+ *                          for now, so no long path prefixing needed.
+ * @param   pwszFullName    The output buffer.
+ * @param   cwcFullName     The output buffer size excluding the terminator.
+ * @param   fNative         Whether the user supplied name is a native or
+ *                          portable one.
+ */
+static int rtLocalIpcWinConstructName(const char *pszName, PRTUTF16 pwszFullName, size_t cwcFullName, bool fNative)
+{
+    if (!fNative)
+    {
+        static RTUTF16 const s_wszPrefix[] = RTLOCALIPC_WIN_PREFIX;
+        Assert(cwcFullName * sizeof(RTUTF16) > sizeof(s_wszPrefix));
+        memcpy(pwszFullName, s_wszPrefix, sizeof(s_wszPrefix));
+        cwcFullName  -= RT_ELEMENTS(s_wszPrefix) - 1;
+        pwszFullName += RT_ELEMENTS(s_wszPrefix) - 1;
+    }
+    return RTStrToUtf16Ex(pszName, RTSTR_MAX, &pwszFullName, cwcFullName + 1, NULL);
+}
+
+
+RTDECL(int) RTLocalIpcServerCreate(PRTLOCALIPCSERVER phServer, const char *pszName, uint32_t fFlags)
+{
+    /*
+     * Validate parameters.
+     */
+    AssertPtrReturn(phServer, VERR_INVALID_POINTER);
+    *phServer = NIL_RTLOCALIPCSERVER;
+    AssertReturn(!(fFlags & ~RTLOCALIPC_FLAGS_VALID_MASK), VERR_INVALID_FLAGS);
+    size_t cwcFullName;
+    int rc = rtLocalIpcWinValidateName(pszName, &cwcFullName, RT_BOOL(fFlags & RTLOCALIPC_FLAGS_NATIVE_NAME));
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Allocate and initialize the instance data.
+         */
+        size_t cbThis = RT_UOFFSETOF_DYN(RTLOCALIPCSERVERINT, wszName[cwcFullName + 1]);
+        PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)RTMemAllocVar(cbThis);
+        AssertReturn(pThis, VERR_NO_MEMORY);
+
+        pThis->u32Magic   = RTLOCALIPCSERVER_MAGIC;
+        pThis->cRefs      = 1; /* the one we return */
+        pThis->fCancelled = false;
+
+        rc = rtLocalIpcWinConstructName(pszName, pThis->wszName, cwcFullName, RT_BOOL(fFlags & RTLOCALIPC_FLAGS_NATIVE_NAME));
+        if (RT_SUCCESS(rc))
+        {
+            rc = RTCritSectInit(&pThis->CritSect);
+            if (RT_SUCCESS(rc))
+            {
+                pThis->hEvent = CreateEvent(NULL /*lpEventAttributes*/, TRUE /*bManualReset*/,
+                                            FALSE /*bInitialState*/, NULL /*lpName*/);
+                if (pThis->hEvent != NULL)
+                {
+                    RT_ZERO(pThis->OverlappedIO);
+                    pThis->OverlappedIO.Internal = STATUS_PENDING;
+                    pThis->OverlappedIO.hEvent   = pThis->hEvent;
+
+                    rc = rtLocalIpcServerWinCreatePipeInstance(&pThis->hNmPipe, pThis->wszName, true /* fFirst */);
+                    if (RT_SUCCESS(rc))
+                    {
+                        *phServer = pThis;
+                        return VINF_SUCCESS;
+                    }
+
+                    BOOL fRc = CloseHandle(pThis->hEvent);
+                    AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+                }
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+
+                int rc2 = RTCritSectDelete(&pThis->CritSect);
+                AssertRC(rc2);
+            }
+        }
+        RTMemFree(pThis);
+    }
+    return rc;
+}
+
+
+/**
+ * Retains a reference to the server instance.
+ *
+ * @returns
+ * @param   pThis               The server instance.
+ */
+DECLINLINE(void) rtLocalIpcServerRetain(PRTLOCALIPCSERVERINT pThis)
+{
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2 && cRefs); NOREF(cRefs);
+}
+
+
+/**
+ * Call when the reference count reaches 0.
+ *
+ * Caller owns the critsect.
+ *
+ * @returns VINF_OBJECT_DESTROYED
+ * @param   pThis       The instance to destroy.
+ */
+DECL_NO_INLINE(static, int) rtLocalIpcServerWinDestroy(PRTLOCALIPCSERVERINT pThis)
+{
+    Assert(pThis->u32Magic == ~RTLOCALIPCSERVER_MAGIC);
+    pThis->u32Magic = ~RTLOCALIPCSERVER_MAGIC;
+
+    BOOL fRc = CloseHandle(pThis->hNmPipe);
+    AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+    pThis->hNmPipe = INVALID_HANDLE_VALUE;
+
+    fRc = CloseHandle(pThis->hEvent);
+    AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+    pThis->hEvent = NULL;
+
+    RTCritSectLeave(&pThis->CritSect);
+    RTCritSectDelete(&pThis->CritSect);
+
+    RTMemFree(pThis);
+    return VINF_OBJECT_DESTROYED;
+}
+
+
+/**
+ * Server instance destructor.
+ *
+ * @returns VINF_OBJECT_DESTROYED
+ * @param   pThis               The server instance.
+ */
+DECL_NO_INLINE(static, int) rtLocalIpcServerDtor(PRTLOCALIPCSERVERINT pThis)
+{
+    RTCritSectEnter(&pThis->CritSect);
+    return rtLocalIpcServerWinDestroy(pThis);
+}
+
+
+/**
+ * Releases a reference to the server instance.
+ *
+ * @returns VINF_SUCCESS if only release, VINF_OBJECT_DESTROYED if destroyed.
+ * @param   pThis               The server instance.
+ */
+DECLINLINE(int) rtLocalIpcServerRelease(PRTLOCALIPCSERVERINT pThis)
+{
+    uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2);
+    if (!cRefs)
+        return rtLocalIpcServerDtor(pThis);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Releases a reference to the server instance and leaves the critsect.
+ *
+ * @returns VINF_SUCCESS if only release, VINF_OBJECT_DESTROYED if destroyed.
+ * @param   pThis               The server instance.
+ */
+DECLINLINE(int) rtLocalIpcServerReleaseAndUnlock(PRTLOCALIPCSERVERINT pThis)
+{
+    uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2);
+    if (!cRefs)
+        return rtLocalIpcServerWinDestroy(pThis);
+    return RTCritSectLeave(&pThis->CritSect);
+}
+
+
+
+RTDECL(int) RTLocalIpcServerDestroy(RTLOCALIPCSERVER hServer)
+{
+    /*
+     * Validate input.
+     */
+    if (hServer == NIL_RTLOCALIPCSERVER)
+        return VINF_SUCCESS;
+    PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)hServer;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSERVER_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Cancel any thread currently busy using the server,
+     * leaving the cleanup to it.
+     */
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTLOCALIPCSERVER_MAGIC, RTLOCALIPCSERVER_MAGIC), VERR_WRONG_ORDER);
+
+    RTCritSectEnter(&pThis->CritSect);
+
+    /* Cancel everything. */
+    ASMAtomicUoWriteBool(&pThis->fCancelled, true);
+    if (pThis->cRefs > 1)
+    {
+        BOOL fRc = SetEvent(pThis->hEvent);
+        AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+    }
+
+    return rtLocalIpcServerReleaseAndUnlock(pThis);
+}
+
+
+RTDECL(int) RTLocalIpcServerListen(RTLOCALIPCSERVER hServer, PRTLOCALIPCSESSION phClientSession)
+{
+    /*
+     * Validate input.
+     */
+    PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)hServer;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSERVER_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(phClientSession, VERR_INVALID_POINTER);
+
+    /*
+     * Enter the critsect before inspecting the object further.
+     */
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    AssertRCReturn(rc, rc);
+
+    rtLocalIpcServerRetain(pThis);
+    if (!pThis->fCancelled)
+    {
+        ResetEvent(pThis->hEvent);
+
+        RTCritSectLeave(&pThis->CritSect);
+
+        /*
+         * Try connect a client. We need to use overlapped I/O here because
+         * of the cancellation done by RTLocalIpcServerCancel and RTLocalIpcServerDestroy.
+         */
+        SetLastError(NO_ERROR);
+        BOOL fRc = ConnectNamedPipe(pThis->hNmPipe, &pThis->OverlappedIO);
+        DWORD dwErr = fRc ? NO_ERROR : GetLastError();
+        if (    !fRc
+            &&  dwErr == ERROR_IO_PENDING)
+        {
+            WaitForSingleObject(pThis->hEvent, INFINITE);
+            DWORD dwIgnored;
+            fRc = GetOverlappedResult(pThis->hNmPipe, &pThis->OverlappedIO, &dwIgnored, FALSE /* bWait*/);
+            dwErr = fRc ? NO_ERROR : GetLastError();
+        }
+
+        RTCritSectEnter(&pThis->CritSect);
+        if (   !pThis->fCancelled /* Event signalled but not cancelled? */
+            && pThis->u32Magic == RTLOCALIPCSERVER_MAGIC)
+        {
+            /*
+             * Still alive, some error or an actual client.
+             *
+             * If it's the latter we'll have to create a new pipe instance that
+             * replaces the current one for the server. The current pipe instance
+             * will be assigned to the client session.
+             */
+            if (   fRc
+                || dwErr == ERROR_PIPE_CONNECTED)
+            {
+                HANDLE hNmPipe;
+                rc = rtLocalIpcServerWinCreatePipeInstance(&hNmPipe, pThis->wszName, false /* fFirst */);
+                if (RT_SUCCESS(rc))
+                {
+                    HANDLE hNmPipeSession = pThis->hNmPipe; /* consumed */
+                    pThis->hNmPipe = hNmPipe;
+                    rc = rtLocalIpcWinCreateSession(phClientSession, hNmPipeSession);
+                }
+                else
+                {
+                    /*
+                     * We failed to create a new instance for the server, disconnect
+                     * the client and fail. Don't try service the client here.
+                     */
+                    fRc = DisconnectNamedPipe(pThis->hNmPipe);
+                    AssertMsg(fRc, ("%d\n", GetLastError()));
+                }
+            }
+            else
+                rc = RTErrConvertFromWin32(dwErr);
+        }
+        else
+        {
+            /*
+             * Cancelled.
+             *
+             * Cancel the overlapped io if it didn't complete (must be done
+             * in the this thread) or disconnect the client.
+             */
+            Assert(pThis->fCancelled);
+            if (    fRc
+                ||  dwErr == ERROR_PIPE_CONNECTED)
+                fRc = DisconnectNamedPipe(pThis->hNmPipe);
+            else if (dwErr == ERROR_IO_PENDING)
+                fRc = CancelIo(pThis->hNmPipe);
+            else
+                fRc = TRUE;
+            AssertMsg(fRc, ("%d\n", GetLastError()));
+            rc = VERR_CANCELLED;
+        }
+    }
+    else
+    {
+        /*pThis->fCancelled = false; - Terrible interface idea. Add API to clear fCancelled if ever required. */
+        rc = VERR_CANCELLED;
+    }
+    rtLocalIpcServerReleaseAndUnlock(pThis);
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcServerCancel(RTLOCALIPCSERVER hServer)
+{
+    /*
+     * Validate input.
+     */
+    PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)hServer;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSERVER_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Enter the critical section, then set the cancellation flag
+     * and signal the event (to wake up anyone in/at WaitForSingleObject).
+     */
+    rtLocalIpcServerRetain(pThis);
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        ASMAtomicUoWriteBool(&pThis->fCancelled, true);
+
+        BOOL fRc = SetEvent(pThis->hEvent);
+        if (fRc)
+            rc = VINF_SUCCESS;
+        else
+        {
+            DWORD dwErr = GetLastError();
+            AssertMsgFailed(("dwErr=%u\n", dwErr));
+            rc = RTErrConvertFromWin32(dwErr);
+        }
+
+        rtLocalIpcServerReleaseAndUnlock(pThis);
+    }
+    else
+        rtLocalIpcServerRelease(pThis);
+    return rc;
+}
+
+
+/**
+ * Create a session instance for a new server client or a client connect.
+ *
+ * @returns IPRT status code.
+ *
+ * @param   ppSession       Where to store the session handle on success.
+ * @param   hNmPipeSession  The named pipe handle if server calling,
+ *                          INVALID_HANDLE_VALUE if client connect.  This will
+ *                          be consumed by this session, meaning on failure to
+ *                          create the session it will be closed.
+ */
+static int rtLocalIpcWinCreateSession(PRTLOCALIPCSESSIONINT *ppSession, HANDLE hNmPipeSession)
+{
+    AssertPtr(ppSession);
+
+    /*
+     * Allocate and initialize the session instance data.
+     */
+    int rc;
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)RTMemAllocZ(sizeof(*pThis));
+    if (pThis)
+    {
+        pThis->u32Magic         = RTLOCALIPCSESSION_MAGIC;
+        pThis->cRefs            = 1; /* our ref */
+        pThis->fCancelled       = false;
+        pThis->fZeroByteRead    = false;
+        pThis->fServerSide      = hNmPipeSession != INVALID_HANDLE_VALUE;
+        pThis->hNmPipe          = hNmPipeSession;
+#if 0 /* Non-blocking writes are not yet supported. */
+        pThis->pbBounceBuf      = NULL;
+        pThis->cbBounceBufAlloc = 0;
+        pThis->cbBounceBufUsed  = 0;
+#endif
+        rc = RTCritSectInit(&pThis->CritSect);
+        if (RT_SUCCESS(rc))
+        {
+            pThis->Read.hEvent = CreateEvent(NULL /*lpEventAttributes*/, TRUE /*bManualReset*/,
+                                             FALSE /*bInitialState*/, NULL /*lpName*/);
+            if (pThis->Read.hEvent != NULL)
+            {
+                pThis->Read.OverlappedIO.Internal = STATUS_PENDING;
+                pThis->Read.OverlappedIO.hEvent   = pThis->Read.hEvent;
+                pThis->Read.hActiveThread         = NIL_RTTHREAD;
+
+                pThis->Write.hEvent = CreateEvent(NULL /*lpEventAttributes*/, TRUE /*bManualReset*/,
+                                                  FALSE /*bInitialState*/, NULL /*lpName*/);
+                if (pThis->Write.hEvent != NULL)
+                {
+                    pThis->Write.OverlappedIO.Internal = STATUS_PENDING;
+                    pThis->Write.OverlappedIO.hEvent   = pThis->Write.hEvent;
+                    pThis->Write.hActiveThread         = NIL_RTTHREAD;
+
+                    *ppSession = pThis;
+                    return VINF_SUCCESS;
+                }
+
+                CloseHandle(pThis->Read.hEvent);
+            }
+
+            /* bail out */
+            rc = RTErrConvertFromWin32(GetLastError());
+            RTCritSectDelete(&pThis->CritSect);
+        }
+        RTMemFree(pThis);
+    }
+    else
+        rc = VERR_NO_MEMORY;
+
+    if (hNmPipeSession != INVALID_HANDLE_VALUE)
+    {
+        BOOL fRc = CloseHandle(hNmPipeSession);
+        AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionConnect(PRTLOCALIPCSESSION phSession, const char *pszName, uint32_t fFlags)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(phSession, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTLOCALIPC_C_FLAGS_VALID_MASK), VERR_INVALID_FLAGS);
+
+    size_t cwcFullName;
+    int rc = rtLocalIpcWinValidateName(pszName, &cwcFullName, RT_BOOL(fFlags & RTLOCALIPC_C_FLAGS_NATIVE_NAME));
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Create a session (shared with server client session creation).
+         */
+        PRTLOCALIPCSESSIONINT pThis;
+        rc = rtLocalIpcWinCreateSession(&pThis, INVALID_HANDLE_VALUE);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Try open the pipe.
+             */
+            PSECURITY_DESCRIPTOR pSecDesc;
+            rc = rtLocalIpcServerWinAllocSecurityDescriptior(&pSecDesc, false /*fServer*/);
+            if (RT_SUCCESS(rc))
+            {
+                PRTUTF16 pwszFullName = RTUtf16Alloc((cwcFullName + 1) * sizeof(RTUTF16));
+                if (pwszFullName)
+                    rc = rtLocalIpcWinConstructName(pszName, pwszFullName, cwcFullName,
+                                                    RT_BOOL(fFlags & RTLOCALIPC_C_FLAGS_NATIVE_NAME));
+                else
+                    rc = VERR_NO_UTF16_MEMORY;
+                if (RT_SUCCESS(rc))
+                {
+                    SECURITY_ATTRIBUTES SecAttrs;
+                    SecAttrs.nLength              = sizeof(SECURITY_ATTRIBUTES);
+                    SecAttrs.lpSecurityDescriptor = pSecDesc;
+                    SecAttrs.bInheritHandle       = FALSE;
+
+                    HANDLE hPipe = CreateFileW(pwszFullName,
+                                               GENERIC_READ | GENERIC_WRITE,
+                                               0 /*no sharing*/,
+                                               &SecAttrs,
+                                               OPEN_EXISTING,
+                                               FILE_FLAG_OVERLAPPED
+                                               /* Needed in order to prevent the server to impersonate with this thread's
+                                                * security context. See #9773. */
+                                               | SECURITY_SQOS_PRESENT | SECURITY_ANONYMOUS,
+                                               NULL /*no template handle*/);
+                    if (hPipe != INVALID_HANDLE_VALUE)
+                    {
+                        pThis->hNmPipe = hPipe;
+
+                        LocalFree(pSecDesc);
+                        RTUtf16Free(pwszFullName);
+
+                        /*
+                         * We're done!
+                         */
+                        *phSession = pThis;
+                        return VINF_SUCCESS;
+                    }
+
+                    rc = RTErrConvertFromWin32(GetLastError());
+                }
+
+                RTUtf16Free(pwszFullName);
+                LocalFree(pSecDesc);
+            }
+
+            /* destroy the session handle. */
+            CloseHandle(pThis->Read.hEvent);
+            CloseHandle(pThis->Write.hEvent);
+            RTCritSectDelete(&pThis->CritSect);
+
+            RTMemFree(pThis);
+        }
+    }
+    return rc;
+}
+
+
+/**
+ * Cancells all pending I/O operations, forcing the methods to return with
+ * VERR_CANCELLED (unless they've got actual data to return).
+ *
+ * Used by RTLocalIpcSessionCancel and RTLocalIpcSessionClose.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The client session instance.
+ */
+static int rtLocalIpcWinCancel(PRTLOCALIPCSESSIONINT pThis)
+{
+    ASMAtomicUoWriteBool(&pThis->fCancelled, true);
+
+    /*
+     * Call CancelIo since this call cancels both read and write oriented operations.
+     */
+    if (   pThis->fZeroByteRead
+        || pThis->Read.hActiveThread != NIL_RTTHREAD
+        || pThis->Write.hActiveThread != NIL_RTTHREAD)
+        CancelIo(pThis->hNmPipe);
+
+    /*
+     * Set both event semaphores.
+     */
+    BOOL fRc = SetEvent(pThis->Read.hEvent);
+    AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+    fRc = SetEvent(pThis->Write.hEvent);
+    AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Retains a reference to the session instance.
+ *
+ * @param   pThis               The client session instance.
+ */
+DECLINLINE(void) rtLocalIpcSessionRetain(PRTLOCALIPCSESSIONINT pThis)
+{
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2 && cRefs); NOREF(cRefs);
+}
+
+
+RTDECL(uint32_t) RTLocalIpcSessionRetain(RTLOCALIPCSESSION hSession)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, UINT32_MAX);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, UINT32_MAX);
+
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2 && cRefs);
+    return cRefs;
+}
+
+
+/**
+ * Call when the reference count reaches 0.
+ *
+ * Caller owns the critsect.
+ *
+ * @returns VINF_OBJECT_DESTROYED
+ * @param   pThis       The instance to destroy.
+ */
+DECL_NO_INLINE(static, int) rtLocalIpcSessionWinDestroy(PRTLOCALIPCSESSIONINT pThis)
+{
+    BOOL fRc = CloseHandle(pThis->hNmPipe);
+    AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
+    pThis->hNmPipe = INVALID_HANDLE_VALUE;
+
+    fRc = CloseHandle(pThis->Write.hEvent);
+    AssertMsg(fRc, ("%d\n", GetLastError()));
+    pThis->Write.hEvent = NULL;
+
+    fRc = CloseHandle(pThis->Read.hEvent);
+    AssertMsg(fRc, ("%d\n", GetLastError()));
+    pThis->Read.hEvent = NULL;
+
+    int rc2 = RTCritSectLeave(&pThis->CritSect); AssertRC(rc2);
+    RTCritSectDelete(&pThis->CritSect);
+
+    RTMemFree(pThis);
+    return VINF_OBJECT_DESTROYED;
+}
+
+
+/**
+ * Releases a reference to the session instance and unlock it.
+ *
+ * @returns VINF_SUCCESS or VINF_OBJECT_DESTROYED as appropriate.
+ * @param   pThis               The session instance.
+ */
+DECLINLINE(int) rtLocalIpcSessionReleaseAndUnlock(PRTLOCALIPCSESSIONINT pThis)
+{
+    uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2);
+    if (!cRefs)
+        return rtLocalIpcSessionWinDestroy(pThis);
+
+    int rc2 = RTCritSectLeave(&pThis->CritSect); AssertRC(rc2);
+    Log(("rtLocalIpcSessionReleaseAndUnlock: %u refs left\n", cRefs));
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(uint32_t) RTLocalIpcSessionRelease(RTLOCALIPCSESSION hSession)
+{
+    if (hSession == NIL_RTLOCALIPCSESSION)
+        return 0;
+
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, UINT32_MAX);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, UINT32_MAX);
+
+    uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    Assert(cRefs < UINT32_MAX / 2);
+    if (cRefs)
+        Log(("RTLocalIpcSessionRelease: %u refs left\n", cRefs));
+    else
+    {
+        RTCritSectEnter(&pThis->CritSect);
+        rtLocalIpcSessionWinDestroy(pThis);
+    }
+    return cRefs;
+}
+
+
+RTDECL(int) RTLocalIpcSessionClose(RTLOCALIPCSESSION hSession)
+{
+    /*
+     * Validate input.
+     */
+    if (hSession == NIL_RTLOCALIPCSESSION)
+        return VINF_SUCCESS;
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Invalidate the instance, cancel all outstanding I/O and drop our reference.
+     */
+    RTCritSectEnter(&pThis->CritSect);
+    rtLocalIpcWinCancel(pThis);
+    return rtLocalIpcSessionReleaseAndUnlock(pThis);
+}
+
+
+/**
+ * Handles WaitForSingleObject return value when waiting for a zero byte read.
+ *
+ * The zero byte read is started by the RTLocalIpcSessionWaitForData method and
+ * left pending when the function times out.  This saves us the problem of
+ * CancelIo messing with all active I/O operations and the trouble of restarting
+ * the zero byte read the next time the method is called.  However should
+ * RTLocalIpcSessionRead be called after a failed RTLocalIpcSessionWaitForData
+ * call, the zero byte read will still be pending and it must wait for it to
+ * complete before the OVERLAPPEDIO structure can be reused.
+ *
+ * Thus, both functions will do WaitForSingleObject and share this routine to
+ * handle the outcome.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The session instance.
+ * @param   rcWait              The WaitForSingleObject return code.
+ */
+static int rtLocalIpcWinGetZeroReadResult(PRTLOCALIPCSESSIONINT pThis, DWORD rcWait)
+{
+    int rc;
+    DWORD cbRead = 42;
+    if (rcWait == WAIT_OBJECT_0)
+    {
+        if (GetOverlappedResult(pThis->hNmPipe, &pThis->Read.OverlappedIO, &cbRead, !pThis->fCancelled /*fWait*/))
+        {
+            Assert(cbRead == 0);
+            rc = VINF_SUCCESS;
+            pThis->fZeroByteRead = false;
+        }
+        else if (pThis->fCancelled)
+            rc = VERR_CANCELLED;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+    {
+        /* We try get the result here too, just in case we're lucky, but no waiting. */
+        DWORD dwErr = GetLastError();
+        if (GetOverlappedResult(pThis->hNmPipe, &pThis->Read.OverlappedIO, &cbRead, FALSE /*fWait*/))
+        {
+            Assert(cbRead == 0);
+            rc = VINF_SUCCESS;
+            pThis->fZeroByteRead = false;
+        }
+        else if (rcWait == WAIT_TIMEOUT)
+            rc = VERR_TIMEOUT;
+        else if (rcWait == WAIT_ABANDONED)
+            rc = VERR_INVALID_HANDLE;
+        else
+            rc = RTErrConvertFromWin32(dwErr);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionRead(RTLOCALIPCSESSION hSession, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    /* pcbRead is optional. */
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        rtLocalIpcSessionRetain(pThis);
+        if (pThis->Read.hActiveThread == NIL_RTTHREAD)
+        {
+            pThis->Read.hActiveThread = RTThreadSelf();
+
+            size_t cbTotalRead = 0;
+            while (cbToRead > 0)
+            {
+                DWORD cbRead = 0;
+                if (!pThis->fCancelled)
+                {
+                    /*
+                     * Wait for pending zero byte read, if necessary.
+                     * Note! It cannot easily be cancelled due to concurrent current writes.
+                     */
+                    if (!pThis->fZeroByteRead)
+                    { /* likely */ }
+                    else
+                    {
+                        RTCritSectLeave(&pThis->CritSect);
+                        DWORD rcWait = WaitForSingleObject(pThis->Read.OverlappedIO.hEvent, RT_MS_1MIN);
+                        RTCritSectEnter(&pThis->CritSect);
+
+                        rc = rtLocalIpcWinGetZeroReadResult(pThis, rcWait);
+                        if (RT_SUCCESS(rc) || rc == VERR_TIMEOUT)
+                            continue;
+                        break;
+                    }
+
+                    /*
+                     * Kick of a an overlapped read.  It should return immediately if
+                     * there is bytes in the buffer.  If not, we'll cancel it and see
+                     * what we get back.
+                     */
+                    rc = ResetEvent(pThis->Read.OverlappedIO.hEvent); Assert(rc == TRUE);
+                    RTCritSectLeave(&pThis->CritSect);
+
+                    if (ReadFile(pThis->hNmPipe, pvBuf,
+                                 cbToRead <= ~(DWORD)0 ? (DWORD)cbToRead : ~(DWORD)0,
+                                 &cbRead, &pThis->Read.OverlappedIO))
+                    {
+                        RTCritSectEnter(&pThis->CritSect);
+                        rc = VINF_SUCCESS;
+                    }
+                    else if (GetLastError() == ERROR_IO_PENDING)
+                    {
+                        WaitForSingleObject(pThis->Read.OverlappedIO.hEvent, INFINITE);
+
+                        RTCritSectEnter(&pThis->CritSect);
+                        if (GetOverlappedResult(pThis->hNmPipe, &pThis->Read.OverlappedIO, &cbRead, TRUE /*fWait*/))
+                            rc = VINF_SUCCESS;
+                        else
+                        {
+                            if (pThis->fCancelled)
+                                rc = VERR_CANCELLED;
+                            else
+                                rc = RTErrConvertFromWin32(GetLastError());
+                            break;
+                        }
+                    }
+                    else
+                    {
+                        rc = RTErrConvertFromWin32(GetLastError());
+                        AssertMsgFailedBreak(("%Rrc\n", rc));
+                    }
+                }
+                else
+                {
+                    rc = VERR_CANCELLED;
+                    break;
+                }
+
+                /* Advance. */
+                cbToRead    -= cbRead;
+                cbTotalRead += cbRead;
+                pvBuf     = (uint8_t *)pvBuf + cbRead;
+            }
+
+            if (pcbRead)
+            {
+                *pcbRead = cbTotalRead;
+                if (   RT_FAILURE(rc)
+                    && cbTotalRead
+                    && rc != VERR_INVALID_POINTER)
+                    rc = VINF_SUCCESS;
+            }
+
+            pThis->Read.hActiveThread = NIL_RTTHREAD;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        rtLocalIpcSessionReleaseAndUnlock(pThis);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionReadNB(RTLOCALIPCSESSION hSession, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    AssertPtrReturn(pcbRead, VERR_INVALID_POINTER);
+    *pcbRead = 0;
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        rtLocalIpcSessionRetain(pThis);
+        if (pThis->Read.hActiveThread == NIL_RTTHREAD)
+        {
+            pThis->Read.hActiveThread = RTThreadSelf();
+
+            for (;;)
+            {
+                DWORD cbRead = 0;
+                if (!pThis->fCancelled)
+                {
+                    /*
+                     * Wait for pending zero byte read, if necessary.
+                     * Note! It cannot easily be cancelled due to concurrent current writes.
+                     */
+                    if (!pThis->fZeroByteRead)
+                    { /* likely */ }
+                    else
+                    {
+                        RTCritSectLeave(&pThis->CritSect);
+                        DWORD rcWait = WaitForSingleObject(pThis->Read.OverlappedIO.hEvent, 0);
+                        RTCritSectEnter(&pThis->CritSect);
+
+                        rc = rtLocalIpcWinGetZeroReadResult(pThis, rcWait);
+                        if (RT_SUCCESS(rc))
+                            continue;
+
+                        if (rc == VERR_TIMEOUT)
+                            rc = VINF_TRY_AGAIN;
+                        break;
+                    }
+
+                    /*
+                     * Figure out how much we can read (cannot try and cancel here
+                     * like in the anonymous pipe code).
+                     */
+                    DWORD cbAvailable;
+                    if (PeekNamedPipe(pThis->hNmPipe, NULL, 0, NULL, &cbAvailable, NULL))
+                    {
+                        if (cbAvailable == 0 || cbToRead == 0)
+                        {
+                            *pcbRead = 0;
+                            rc = VINF_TRY_AGAIN;
+                            break;
+                        }
+                    }
+                    else
+                    {
+                        rc = RTErrConvertFromWin32(GetLastError());
+                        break;
+                    }
+                    if (cbAvailable > cbToRead)
+                        cbAvailable = (DWORD)cbToRead;
+
+                    /*
+                     * Kick of a an overlapped read.  It should return immediately, so we
+                     * don't really need to leave the critsect here.
+                     */
+                    rc = ResetEvent(pThis->Read.OverlappedIO.hEvent); Assert(rc == TRUE);
+                    if (ReadFile(pThis->hNmPipe, pvBuf, cbAvailable, &cbRead, &pThis->Read.OverlappedIO))
+                    {
+                        *pcbRead = cbRead;
+                        rc = VINF_SUCCESS;
+                    }
+                    else if (GetLastError() == ERROR_IO_PENDING)
+                    {
+                        DWORD rcWait = WaitForSingleObject(pThis->Read.OverlappedIO.hEvent, 0);
+                        if (rcWait == WAIT_TIMEOUT)
+                        {
+                            RTCritSectLeave(&pThis->CritSect);
+                            rcWait = WaitForSingleObject(pThis->Read.OverlappedIO.hEvent, INFINITE);
+                            RTCritSectEnter(&pThis->CritSect);
+                        }
+                        if (GetOverlappedResult(pThis->hNmPipe, &pThis->Read.OverlappedIO, &cbRead, TRUE /*fWait*/))
+                        {
+                            *pcbRead = cbRead;
+                            rc = VINF_SUCCESS;
+                        }
+                        else
+                        {
+                            if (pThis->fCancelled)
+                                rc = VERR_CANCELLED;
+                            else
+                                rc = RTErrConvertFromWin32(GetLastError());
+                        }
+                    }
+                    else
+                    {
+                        rc = RTErrConvertFromWin32(GetLastError());
+                        AssertMsgFailedBreak(("%Rrc\n", rc));
+                    }
+                }
+                else
+                    rc = VERR_CANCELLED;
+                break;
+            }
+
+            pThis->Read.hActiveThread = NIL_RTTHREAD;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        rtLocalIpcSessionReleaseAndUnlock(pThis);
+    }
+
+    return rc;
+}
+
+
+#if 0 /* Non-blocking writes are not yet supported. */
+/**
+ * Common worker for handling I/O completion.
+ *
+ * This is used by RTLocalIpcSessionClose and RTLocalIpcSessionWrite.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The pipe instance handle.
+ */
+static int rtLocalIpcSessionWriteCheckCompletion(PRTLOCALIPCSESSIONINT pThis)
+{
+    int rc;
+    DWORD rcWait = WaitForSingleObject(pThis->OverlappedIO.hEvent, 0);
+    if (rcWait == WAIT_OBJECT_0)
+    {
+        DWORD cbWritten = 0;
+        if (GetOverlappedResult(pThis->hNmPipe, &pThis->OverlappedIO, &cbWritten, TRUE))
+        {
+            for (;;)
+            {
+                if (cbWritten >= pThis->cbBounceBufUsed)
+                {
+                    pThis->fIOPending = false;
+                    rc = VINF_SUCCESS;
+                    break;
+                }
+
+                /* resubmit the remainder of the buffer - can this actually happen? */
+                memmove(&pThis->pbBounceBuf[0], &pThis->pbBounceBuf[cbWritten], pThis->cbBounceBufUsed - cbWritten);
+                rc = ResetEvent(pThis->OverlappedIO.hEvent); Assert(rc == TRUE);
+                if (!WriteFile(pThis->hNmPipe, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed,
+                               &cbWritten, &pThis->OverlappedIO))
+                {
+                    DWORD dwErr = GetLastError();
+                    if (dwErr == ERROR_IO_PENDING)
+                        rc = VINF_TRY_AGAIN;
+                    else
+                    {
+                        pThis->fIOPending = false;
+                        if (dwErr == ERROR_NO_DATA)
+                            rc = VERR_BROKEN_PIPE;
+                        else
+                            rc = RTErrConvertFromWin32(dwErr);
+                    }
+                    break;
+                }
+                Assert(cbWritten > 0);
+            }
+        }
+        else
+        {
+            pThis->fIOPending = false;
+            rc = RTErrConvertFromWin32(GetLastError());
+        }
+    }
+    else if (rcWait == WAIT_TIMEOUT)
+        rc = VINF_TRY_AGAIN;
+    else
+    {
+        pThis->fIOPending = false;
+        if (rcWait == WAIT_ABANDONED)
+            rc = VERR_INVALID_HANDLE;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    return rc;
+}
+#endif
+
+
+RTDECL(int) RTLocalIpcSessionWrite(RTLOCALIPCSESSION hSession, const void *pvBuf, size_t cbToWrite)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbToWrite, VERR_INVALID_PARAMETER);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        rtLocalIpcSessionRetain(pThis);
+        if (pThis->Write.hActiveThread == NIL_RTTHREAD)
+        {
+            pThis->Write.hActiveThread = RTThreadSelf();
+
+            /*
+             * Try write everything. No bounce buffering necessary.
+             */
+            size_t cbTotalWritten = 0;
+            while (cbToWrite > 0)
+            {
+                DWORD cbWritten = 0;
+                if (!pThis->fCancelled)
+                {
+                    BOOL fRc = ResetEvent(pThis->Write.OverlappedIO.hEvent); Assert(fRc == TRUE);
+                    RTCritSectLeave(&pThis->CritSect);
+
+                    DWORD const cbToWriteInThisIteration = cbToWrite <= ~(DWORD)0 ? (DWORD)cbToWrite : ~(DWORD)0;
+                    fRc = WriteFile(pThis->hNmPipe, pvBuf, cbToWriteInThisIteration, &cbWritten, &pThis->Write.OverlappedIO);
+                    if (fRc)
+                        rc = VINF_SUCCESS;
+                    else
+                    {
+                        DWORD dwErr = GetLastError();
+                        if (dwErr == ERROR_IO_PENDING)
+                        {
+                            DWORD rcWait = WaitForSingleObject(pThis->Write.OverlappedIO.hEvent, INFINITE);
+                            if (rcWait == WAIT_OBJECT_0)
+                            {
+                                if (GetOverlappedResult(pThis->hNmPipe, &pThis->Write.OverlappedIO, &cbWritten, TRUE /*fWait*/))
+                                    rc = VINF_SUCCESS;
+                                else
+                                    rc = RTErrConvertFromWin32(GetLastError());
+                            }
+                            else if (rcWait == WAIT_TIMEOUT)
+                                rc = VERR_TIMEOUT;
+                            else if (rcWait == WAIT_ABANDONED)
+                                rc = VERR_INVALID_HANDLE;
+                            else
+                                rc = RTErrConvertFromWin32(GetLastError());
+                        }
+                        else if (dwErr == ERROR_NO_DATA)
+                            rc = VERR_BROKEN_PIPE;
+                        else
+                            rc = RTErrConvertFromWin32(dwErr);
+                    }
+
+                    if (cbWritten > cbToWriteInThisIteration) /* paranoia^3 */
+                        cbWritten = cbToWriteInThisIteration;
+
+                    RTCritSectEnter(&pThis->CritSect);
+                    if (RT_FAILURE(rc))
+                        break;
+                }
+                else
+                {
+                    rc = VERR_CANCELLED;
+                    break;
+                }
+
+                /* Advance. */
+                pvBuf           = (char const *)pvBuf + cbWritten;
+                cbTotalWritten += cbWritten;
+                cbToWrite      -= cbWritten;
+            }
+
+            pThis->Write.hActiveThread = NIL_RTTHREAD;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        rtLocalIpcSessionReleaseAndUnlock(pThis);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionFlush(RTLOCALIPCSESSION hSession)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        if (pThis->Write.hActiveThread == NIL_RTTHREAD)
+        {
+            /* No flushing on Windows needed since RTLocalIpcSessionWrite will block until
+             * all data was written (or an error occurred). */
+            /** @todo r=bird: above comment is misinformed.
+             *        Implement this as soon as we want an explicit asynchronous version of
+             *        RTLocalIpcSessionWrite on Windows. */
+            rc = VINF_SUCCESS;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        RTCritSectLeave(&pThis->CritSect);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionWaitForData(RTLOCALIPCSESSION hSession, uint32_t cMillies)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+
+    uint64_t const msStart = RTTimeMilliTS();
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        rtLocalIpcSessionRetain(pThis);
+        if (pThis->Read.hActiveThread == NIL_RTTHREAD)
+        {
+            pThis->Read.hActiveThread = RTThreadSelf();
+
+            /*
+             * Wait loop.
+             */
+            for (unsigned iLoop = 0;; iLoop++)
+            {
+                /*
+                 * Check for cancellation before we continue.
+                 */
+                if (!pThis->fCancelled)
+                { /* likely */ }
+                else
+                {
+                    rc = VERR_CANCELLED;
+                    break;
+                }
+
+                /*
+                 * Prep something we can wait on.
+                 */
+                HANDLE hWait = INVALID_HANDLE_VALUE;
+                if (pThis->fZeroByteRead)
+                    hWait = pThis->Read.OverlappedIO.hEvent;
+                else
+                {
+                    /* Peek at the pipe buffer and see how many bytes it contains. */
+                    DWORD cbAvailable;
+                    if (   PeekNamedPipe(pThis->hNmPipe, NULL, 0, NULL, &cbAvailable, NULL)
+                        && cbAvailable)
+                    {
+                        rc = VINF_SUCCESS;
+                        break;
+                    }
+
+                    /* Start a zero byte read operation that we can wait on. */
+                    if (cMillies == 0)
+                    {
+                        rc = VERR_TIMEOUT;
+                        break;
+                    }
+                    BOOL fRc = ResetEvent(pThis->Read.OverlappedIO.hEvent); Assert(fRc == TRUE); NOREF(fRc);
+                    DWORD cbRead = 0;
+                    if (ReadFile(pThis->hNmPipe, pThis->abBuf, 0 /*cbToRead*/, &cbRead, &pThis->Read.OverlappedIO))
+                    {
+                        rc = VINF_SUCCESS;
+                        if (iLoop > 10)
+                            RTThreadYield();
+                    }
+                    else if (GetLastError() == ERROR_IO_PENDING)
+                    {
+                        pThis->fZeroByteRead = true;
+                        hWait = pThis->Read.OverlappedIO.hEvent;
+                    }
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+                    if (RT_FAILURE(rc))
+                        break;
+                }
+
+                /*
+                 * Check for timeout.
+                 */
+                DWORD cMsMaxWait = INFINITE; /* (MSC maybe used uninitialized) */
+                if (cMillies == RT_INDEFINITE_WAIT)
+                    cMsMaxWait = INFINITE;
+                else if (   hWait != INVALID_HANDLE_VALUE
+                         || iLoop > 10)
+                {
+                    uint64_t cMsElapsed = RTTimeMilliTS() - msStart;
+                    if (cMsElapsed <= cMillies)
+                        cMsMaxWait = cMillies - (uint32_t)cMsElapsed;
+                    else if (iLoop == 0)
+                        cMsMaxWait = cMillies ? 1 : 0;
+                    else
+                    {
+                        rc = VERR_TIMEOUT;
+                        break;
+                    }
+                }
+
+                /*
+                 * Wait and collect the result.
+                 */
+                if (hWait != INVALID_HANDLE_VALUE)
+                {
+                    RTCritSectLeave(&pThis->CritSect);
+
+                    DWORD rcWait = WaitForSingleObject(hWait, cMsMaxWait);
+
+                    int rc2 = RTCritSectEnter(&pThis->CritSect);
+                    AssertRC(rc2);
+
+                    rc = rtLocalIpcWinGetZeroReadResult(pThis, rcWait);
+                    break;
+                }
+            }
+
+            pThis->Read.hActiveThread = NIL_RTTHREAD;
+        }
+
+        rtLocalIpcSessionReleaseAndUnlock(pThis);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionCancel(RTLOCALIPCSESSION hSession)
+{
+    PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)hSession;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTLOCALIPCSESSION_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Enter the critical section, then set the cancellation flag
+     * and signal the event (to wake up anyone in/at WaitForSingleObject).
+     */
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        rtLocalIpcSessionRetain(pThis);
+        rc = rtLocalIpcWinCancel(pThis);
+        rtLocalIpcSessionReleaseAndUnlock(pThis);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTLocalIpcSessionQueryProcess(RTLOCALIPCSESSION hSession, PRTPROCESS pProcess)
+{
+    RT_NOREF_PV(hSession); RT_NOREF_PV(pProcess);
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(int) RTLocalIpcSessionQueryUserId(RTLOCALIPCSESSION hSession, PRTUID pUid)
+{
+    RT_NOREF_PV(hSession); RT_NOREF_PV(pUid);
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(int) RTLocalIpcSessionQueryGroupId(RTLOCALIPCSESSION hSession, PRTGID pGid)
+{
+    RT_NOREF_PV(hSession); RT_NOREF_PV(pGid);
+    return VERR_NOT_SUPPORTED;
+}
+
diff --git a/src/VBox/Runtime/r3/win/mp-win.cpp b/src/VBox/Runtime/r3/win/mp-win.cpp
new file mode 100644
index 00000000..b2e6e5ca
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/mp-win.cpp
@@ -0,0 +1,811 @@
+/* $Id: mp-win.cpp $ */
+/** @file
+ * IPRT - Multiprocessor, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SYSTEM
+#include <iprt/win/windows.h>
+
+#include <iprt/mp.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/cpuset.h>
+#include <iprt/ldr.h>
+#include <iprt/mem.h>
+#include <iprt/once.h>
+#include <iprt/param.h>
+#if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#if defined(VBOX) && !defined(IN_GUEST) && !defined(IN_RT_STATIC)
+# include <VBox/sup.h>
+# define IPRT_WITH_GIP_MP_INFO
+#else
+# undef  IPRT_WITH_GIP_MP_INFO
+#endif
+
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** @def RTMPWIN_UPDATE_GIP_GLOBALS
+ * Does lazy (re-)initialization using information provieded by GIP. */
+#ifdef IPRT_WITH_GIP_MP_INFO
+# define RTMPWIN_UPDATE_GIP_GLOBALS() \
+    do { RTMPWIN_UPDATE_GIP_GLOBALS_AND_GET_PGIP(); } while (0)
+#else
+# define RTMPWIN_UPDATE_GIP_GLOBALS() do { } while (0)
+#endif
+
+/** @def RTMPWIN_UPDATE_GIP_GLOBALS_AND_GET_PGIP
+ * Does lazy (re-)initialization using information provieded by GIP and
+ * declare and initalize a pGip local variable. */
+#ifdef IPRT_WITH_GIP_MP_INFO
+#define RTMPWIN_UPDATE_GIP_GLOBALS_AND_GET_PGIP() \
+    PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage; \
+    if (pGip) \
+    { \
+        if (   pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC \
+            && RTOnce(&g_MpInitOnceGip, rtMpWinInitOnceGip, NULL) == VINF_SUCCESS) \
+        { \
+            if (g_cRtMpWinActiveCpus >= pGip->cOnlineCpus) \
+            { /* likely */ } \
+            else \
+                rtMpWinRefreshGip(); \
+        } \
+        else \
+            pGip = NULL; \
+    } else do { } while (0)
+#else
+# define RTMPWIN_UPDATE_GIP_GLOBALS_AND_GET_PGIP() do { } while (0)
+#endif
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Initialize once. */
+static RTONCE                                       g_MpInitOnce = RTONCE_INITIALIZER;
+#ifdef IPRT_WITH_GIP_MP_INFO
+/** Initialize once using GIP. */
+static RTONCE                                       g_MpInitOnceGip = RTONCE_INITIALIZER;
+#endif
+
+static decltype(GetMaximumProcessorCount)          *g_pfnGetMaximumProcessorCount;
+//static decltype(GetActiveProcessorCount)           *g_pfnGetActiveProcessorCount;
+static decltype(GetCurrentProcessorNumber)         *g_pfnGetCurrentProcessorNumber;
+static decltype(GetCurrentProcessorNumberEx)       *g_pfnGetCurrentProcessorNumberEx;
+static decltype(GetLogicalProcessorInformation)    *g_pfnGetLogicalProcessorInformation;
+static decltype(GetLogicalProcessorInformationEx)  *g_pfnGetLogicalProcessorInformationEx;
+
+
+/** The required buffer size for getting group relations. */
+static uint32_t     g_cbRtMpWinGrpRelBuf;
+/** The max number of CPUs (RTMpGetCount). */
+static uint32_t     g_cRtMpWinMaxCpus;
+/** The max number of CPU cores (RTMpGetCoreCount). */
+static uint32_t     g_cRtMpWinMaxCpuCores;
+/** The max number of groups. */
+static uint32_t     g_cRtMpWinMaxCpuGroups;
+/** The number of active CPUs the last time we checked. */
+static uint32_t volatile g_cRtMpWinActiveCpus;
+/** Static per group info.
+ * @remarks  With 256 entries this takes up 33KB.
+ * @sa g_aRtMpNtCpuGroups */
+static struct
+{
+    /** The max CPUs in the group. */
+    uint16_t    cMaxCpus;
+    /** The number of active CPUs at the time of initialization. */
+    uint16_t    cActiveCpus;
+    /** CPU set indexes for each CPU in the group. */
+    int16_t     aidxCpuSetMembers[64];
+}                   g_aRtMpWinCpuGroups[256];
+/** Maps CPU set indexes to RTCPUID.
+ * @sa g_aidRtMpNtByCpuSetIdx  */
+RTCPUID             g_aidRtMpWinByCpuSetIdx[RTCPUSET_MAX_CPUS];
+
+
+/**
+ * @callback_method_impl{FNRTONCE,
+ *      Resolves dynamic imports and initializes globals.}
+ */
+static DECLCALLBACK(int32_t) rtMpWinInitOnce(void *pvUser)
+{
+    RT_NOREF(pvUser);
+
+    Assert(g_WinOsInfoEx.dwOSVersionInfoSize != 0);
+    Assert(g_hModKernel32 != NULL);
+
+    /*
+     * Resolve dynamic APIs.
+     */
+#define RESOLVE_API(a_szMod, a_FnName) \
+        do { \
+            RT_CONCAT(g_pfn,a_FnName) = (decltype(a_FnName) *)GetProcAddress(g_hModKernel32, #a_FnName); \
+        } while (0)
+    RESOLVE_API("kernel32.dll", GetMaximumProcessorCount);
+    //RESOLVE_API("kernel32.dll", GetActiveProcessorCount); - slow :/
+    RESOLVE_API("kernel32.dll", GetCurrentProcessorNumber);
+    RESOLVE_API("kernel32.dll", GetCurrentProcessorNumberEx);
+    RESOLVE_API("kernel32.dll", GetLogicalProcessorInformation);
+    RESOLVE_API("kernel32.dll", GetLogicalProcessorInformationEx);
+
+    /*
+     * Reset globals.
+     */
+    for (unsigned i = 0; i < RT_ELEMENTS(g_aidRtMpWinByCpuSetIdx); i++)
+        g_aidRtMpWinByCpuSetIdx[i] = NIL_RTCPUID;
+    for (unsigned idxGroup = 0; idxGroup < RT_ELEMENTS(g_aRtMpWinCpuGroups); idxGroup++)
+    {
+        g_aRtMpWinCpuGroups[idxGroup].cMaxCpus    = 0;
+        g_aRtMpWinCpuGroups[idxGroup].cActiveCpus = 0;
+        for (unsigned idxMember = 0; idxMember < RT_ELEMENTS(g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers); idxMember++)
+            g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = -1;
+    }
+
+    /*
+     * Query group information, partitioning CPU IDs and CPU set indexes.
+     *
+     * We ASSUME the GroupInfo index is the same as the group number.
+     *
+     * We CANNOT ASSUME that the kernel CPU indexes are assigned in any given
+     * way, though they usually are in group order by active processor.  So,
+     * we do that to avoid trouble.  We must use information provided thru GIP
+     * if we want the kernel CPU set indexes.  Even there, the inactive CPUs
+     * wont have sensible indexes.  Sigh.
+     *
+     * We try to assign IDs to inactive CPUs in the same manner as mp-r0drv-nt.cpp
+     *
+     * Note! We will die (AssertFatal) if there are too many processors!
+     */
+    union
+    {
+        SYSTEM_INFO                                 SysInfo;
+        SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX     Info;
+        uint8_t                                     abPaddingG[  sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX)
+                                                               + sizeof(PROCESSOR_GROUP_INFO) * 256];
+        uint8_t                                     abPaddingC[  sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX)
+                                                               +   (sizeof(PROCESSOR_RELATIONSHIP) + sizeof(GROUP_AFFINITY))
+                                                                 * RTCPUSET_MAX_CPUS];
+    } uBuf;
+    if (g_pfnGetLogicalProcessorInformationEx)
+    {
+        /* Query the information. */
+        DWORD cbData = sizeof(uBuf);
+        AssertFatalMsg(g_pfnGetLogicalProcessorInformationEx(RelationGroup, &uBuf.Info, &cbData) != FALSE,
+                       ("last error = %u, cbData = %u (in %u)\n", GetLastError(), cbData, sizeof(uBuf)));
+        AssertFatalMsg(uBuf.Info.Relationship == RelationGroup,
+                       ("Relationship = %u, expected %u!\n", uBuf.Info.Relationship, RelationGroup));
+        AssertFatalMsg(uBuf.Info.Group.MaximumGroupCount <= RT_ELEMENTS(g_aRtMpWinCpuGroups),
+                       ("MaximumGroupCount is %u, we only support up to %u!\n",
+                        uBuf.Info.Group.MaximumGroupCount, RT_ELEMENTS(g_aRtMpWinCpuGroups)));
+
+        AssertMsg(uBuf.Info.Group.MaximumGroupCount == uBuf.Info.Group.ActiveGroupCount, /* 2nd assumption mentioned above. */
+                  ("%u vs %u\n", uBuf.Info.Group.MaximumGroupCount, uBuf.Info.Group.ActiveGroupCount));
+        AssertFatal(uBuf.Info.Group.MaximumGroupCount >= uBuf.Info.Group.ActiveGroupCount);
+
+        g_cRtMpWinMaxCpuGroups = uBuf.Info.Group.MaximumGroupCount;
+
+        /* Count max cpus (see mp-r0drv0-nt.cpp) why we don't use GetMaximumProcessorCount(ALL). */
+        uint32_t idxGroup;
+        g_cRtMpWinMaxCpus = 0;
+        for (idxGroup = 0; idxGroup < uBuf.Info.Group.ActiveGroupCount; idxGroup++)
+            g_cRtMpWinMaxCpus += uBuf.Info.Group.GroupInfo[idxGroup].MaximumProcessorCount;
+
+        /* Process the active groups. */
+        uint32_t cActive   = 0;
+        uint32_t cInactive = 0;
+        uint32_t idxCpu    = 0;
+        uint32_t idxCpuSetNextInactive = g_cRtMpWinMaxCpus - 1;
+        for (idxGroup = 0; idxGroup < uBuf.Info.Group.ActiveGroupCount; idxGroup++)
+        {
+            PROCESSOR_GROUP_INFO const *pGroupInfo = &uBuf.Info.Group.GroupInfo[idxGroup];
+            g_aRtMpWinCpuGroups[idxGroup].cMaxCpus    = pGroupInfo->MaximumProcessorCount;
+            g_aRtMpWinCpuGroups[idxGroup].cActiveCpus = pGroupInfo->ActiveProcessorCount;
+            for (uint32_t idxMember = 0; idxMember < pGroupInfo->MaximumProcessorCount; idxMember++)
+            {
+                if (pGroupInfo->ActiveProcessorMask & RT_BIT_64(idxMember))
+                {
+                    g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = idxCpu;
+                    g_aidRtMpWinByCpuSetIdx[idxCpu] = idxCpu;
+                    idxCpu++;
+                    cActive++;
+                }
+                else
+                {
+                    if (idxCpuSetNextInactive >= idxCpu)
+                    {
+                        g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = idxCpuSetNextInactive;
+                        g_aidRtMpWinByCpuSetIdx[idxCpuSetNextInactive] = idxCpuSetNextInactive;
+                        idxCpuSetNextInactive--;
+                    }
+                    cInactive++;
+                }
+            }
+        }
+        g_cRtMpWinActiveCpus = cActive;
+        Assert(cActive + cInactive <= g_cRtMpWinMaxCpus);
+        Assert(idxCpu <= idxCpuSetNextInactive + 1);
+        Assert(idxCpu <= g_cRtMpWinMaxCpus);
+
+        /* Just in case the 2nd assumption doesn't hold true and there are inactive groups. */
+        for (; idxGroup < uBuf.Info.Group.MaximumGroupCount; idxGroup++)
+        {
+            DWORD cMaxMembers = g_pfnGetMaximumProcessorCount(idxGroup);
+            g_aRtMpWinCpuGroups[idxGroup].cMaxCpus    = cMaxMembers;
+            g_aRtMpWinCpuGroups[idxGroup].cActiveCpus = 0;
+            for (uint32_t idxMember = 0; idxMember < cMaxMembers; idxMember++)
+            {
+                if (idxCpuSetNextInactive >= idxCpu)
+                {
+                    g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = idxCpuSetNextInactive;
+                    g_aidRtMpWinByCpuSetIdx[idxCpuSetNextInactive] = idxCpuSetNextInactive;
+                    idxCpuSetNextInactive--;
+                }
+                cInactive++;
+            }
+        }
+        Assert(cActive + cInactive <= g_cRtMpWinMaxCpus);
+        Assert(idxCpu <= idxCpuSetNextInactive + 1);
+    }
+    else
+    {
+        /* Legacy: */
+        GetSystemInfo(&uBuf.SysInfo);
+        g_cRtMpWinMaxCpuGroups              = 1;
+        g_cRtMpWinMaxCpus                   = uBuf.SysInfo.dwNumberOfProcessors;
+        g_aRtMpWinCpuGroups[0].cMaxCpus     = uBuf.SysInfo.dwNumberOfProcessors;
+        g_aRtMpWinCpuGroups[0].cActiveCpus  = uBuf.SysInfo.dwNumberOfProcessors;
+
+        for (uint32_t idxMember = 0; idxMember < uBuf.SysInfo.dwNumberOfProcessors; idxMember++)
+        {
+            g_aRtMpWinCpuGroups[0].aidxCpuSetMembers[idxMember] = idxMember;
+            g_aidRtMpWinByCpuSetIdx[idxMember] = idxMember;
+        }
+    }
+
+    AssertFatalMsg(g_cRtMpWinMaxCpus <= RTCPUSET_MAX_CPUS,
+                   ("g_cRtMpWinMaxCpus=%u (%#x); RTCPUSET_MAX_CPUS=%u\n", g_cRtMpWinMaxCpus, g_cRtMpWinMaxCpus, RTCPUSET_MAX_CPUS));
+
+    g_cbRtMpWinGrpRelBuf = sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX)
+                         + (g_cRtMpWinMaxCpuGroups + 2) * sizeof(PROCESSOR_GROUP_INFO);
+
+    /*
+     * Get information about cores.
+     *
+     * Note! This will only give us info about active processors according to
+     *       MSDN, we'll just have to hope that CPUs aren't hotplugged after we
+     *       initialize here (or that the API consumers doesn't care too much).
+     */
+    /** @todo A hot CPU plug event would be nice. */
+    g_cRtMpWinMaxCpuCores = g_cRtMpWinMaxCpus;
+    if (g_pfnGetLogicalProcessorInformationEx)
+    {
+        /* Query the information. */
+        DWORD cbData = sizeof(uBuf);
+        AssertFatalMsg(g_pfnGetLogicalProcessorInformationEx(RelationProcessorCore, &uBuf.Info, &cbData) != FALSE,
+                       ("last error = %u, cbData = %u (in %u)\n", GetLastError(), cbData, sizeof(uBuf)));
+        g_cRtMpWinMaxCpuCores = 0;
+        for (uint32_t off = 0; off < cbData; )
+        {
+            SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *pCur = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)&uBuf.abPaddingG[off];
+            AssertFatalMsg(pCur->Relationship == RelationProcessorCore,
+                           ("off = %#x, Relationship = %u, expected %u!\n", off, pCur->Relationship, RelationProcessorCore));
+            g_cRtMpWinMaxCpuCores++;
+            off += pCur->Size;
+        }
+
+#if ARCH_BITS == 32
+        if (g_cRtMpWinMaxCpuCores > g_cRtMpWinMaxCpus)
+        {
+            /** @todo WOW64 trouble where the emulation environment has folded the high
+             *        processor masks (63..32) into the low (31..0), hiding some
+             *        processors from us.  Currently we don't deal with that. */
+            g_cRtMpWinMaxCpuCores = g_cRtMpWinMaxCpus;
+        }
+        else
+            AssertStmt(g_cRtMpWinMaxCpuCores > 0, g_cRtMpWinMaxCpuCores = g_cRtMpWinMaxCpus);
+#else
+        AssertStmt(g_cRtMpWinMaxCpuCores > 0 && g_cRtMpWinMaxCpuCores <= g_cRtMpWinMaxCpus,
+                   g_cRtMpWinMaxCpuCores = g_cRtMpWinMaxCpus);
+#endif
+    }
+    else
+    {
+        /*
+         * Sadly, on XP and Server 2003, even if the API is present, it does not tell us
+         * how many physical cores there are (any package will look like a single core).
+         * That is worse than not using the API at all, so just skip it unless it's Vista+.
+         */
+        if (   g_pfnGetLogicalProcessorInformation
+            && g_WinOsInfoEx.dwPlatformId == VER_PLATFORM_WIN32_NT
+            && g_WinOsInfoEx.dwMajorVersion >= 6)
+        {
+            /* Query the info. */
+            DWORD                                   cbSysProcInfo = _4K;
+            PSYSTEM_LOGICAL_PROCESSOR_INFORMATION   paSysInfo = NULL;
+            BOOL                                    fRc = FALSE;
+            do
+            {
+                cbSysProcInfo = RT_ALIGN_32(cbSysProcInfo, 256);
+                void *pv = RTMemRealloc(paSysInfo, cbSysProcInfo);
+                if (!pv)
+                    break;
+                paSysInfo = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)pv;
+                fRc = g_pfnGetLogicalProcessorInformation(paSysInfo, &cbSysProcInfo);
+            } while (!fRc && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
+            if (fRc)
+            {
+                /* Count the cores in the result. */
+                g_cRtMpWinMaxCpuCores = 0;
+                uint32_t i = cbSysProcInfo / sizeof(paSysInfo[0]);
+                while (i-- > 0)
+                    if (paSysInfo[i].Relationship == RelationProcessorCore)
+                        g_cRtMpWinMaxCpuCores++;
+
+                AssertStmt(g_cRtMpWinMaxCpuCores > 0 && g_cRtMpWinMaxCpuCores <= g_cRtMpWinMaxCpus,
+                           g_cRtMpWinMaxCpuCores = g_cRtMpWinMaxCpus);
+            }
+            RTMemFree(paSysInfo);
+        }
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+#ifdef IPRT_WITH_GIP_MP_INFO
+/**
+ * @callback_method_impl{FNRTONCE, Updates globals with information from GIP.}
+ */
+static DECLCALLBACK(int32_t) rtMpWinInitOnceGip(void *pvUser)
+{
+    RT_NOREF(pvUser);
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+
+    PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
+    if (   pGip
+        && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC)
+    {
+        /*
+         * Update globals.
+         */
+        if (g_cRtMpWinMaxCpus != pGip->cPossibleCpus)
+            g_cRtMpWinMaxCpus = pGip->cPossibleCpus;
+        if (g_cRtMpWinActiveCpus != pGip->cOnlineCpus)
+            g_cRtMpWinActiveCpus = pGip->cOnlineCpus;
+        Assert(g_cRtMpWinMaxCpuGroups == pGip->cPossibleCpuGroups);
+        if (g_cRtMpWinMaxCpuGroups != pGip->cPossibleCpuGroups)
+        {
+            g_cRtMpWinMaxCpuGroups = pGip->cPossibleCpuGroups;
+            g_cbRtMpWinGrpRelBuf   = sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX)
+                                   + (g_cRtMpWinMaxCpuGroups + 2) * sizeof(PROCESSOR_GROUP_INFO);
+        }
+
+        /*
+         * Update CPU set IDs.
+         */
+        for (unsigned i = g_cRtMpWinMaxCpus; i < RT_ELEMENTS(g_aidRtMpWinByCpuSetIdx); i++)
+            g_aidRtMpWinByCpuSetIdx[i] = NIL_RTCPUID;
+
+        unsigned const cbGip = pGip->cPages * PAGE_SIZE;
+        for (uint32_t idxGroup = 0; idxGroup < g_cRtMpWinMaxCpuGroups; idxGroup++)
+        {
+            uint32_t idxMember;
+            uint32_t offCpuGroup = pGip->aoffCpuGroup[idxGroup];
+            if (offCpuGroup < cbGip)
+            {
+                PSUPGIPCPUGROUP pGipCpuGrp  = (PSUPGIPCPUGROUP)((uintptr_t)pGip + offCpuGroup);
+                uint32_t        cMaxMembers = pGipCpuGrp->cMaxMembers;
+                AssertStmt(cMaxMembers <= RT_ELEMENTS(g_aRtMpWinCpuGroups[0].aidxCpuSetMembers),
+                           cMaxMembers  = RT_ELEMENTS(g_aRtMpWinCpuGroups[0].aidxCpuSetMembers));
+                g_aRtMpWinCpuGroups[idxGroup].cMaxCpus     = cMaxMembers;
+                g_aRtMpWinCpuGroups[idxGroup].cActiveCpus  = RT_MIN(pGipCpuGrp->cMembers, cMaxMembers);
+
+                for (idxMember = 0; idxMember < cMaxMembers; idxMember++)
+                {
+                    int16_t idxSet = pGipCpuGrp->aiCpuSetIdxs[idxMember];
+                    g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = idxSet;
+                    if ((unsigned)idxSet < RT_ELEMENTS(g_aidRtMpWinByCpuSetIdx))
+# ifdef IPRT_WITH_RTCPUID_AS_GROUP_AND_NUMBER
+                        g_aidRtMpWinByCpuSetIdx[idxSet] = RTMPCPUID_FROM_GROUP_AND_NUMBER(idxGroup, idxMember);
+# else
+                        g_aidRtMpWinByCpuSetIdx[idxSet] = idxSet;
+# endif
+                }
+            }
+            else
+                idxMember = 0;
+            for (; idxMember < RT_ELEMENTS(g_aRtMpWinCpuGroups[0].aidxCpuSetMembers); idxMember++)
+                g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = -1;
+        }
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Refreshes globals from GIP after one or more CPUs were added.
+ *
+ * There are potential races here.  We might race other threads and we may race
+ * more CPUs being added.
+ */
+static void rtMpWinRefreshGip(void)
+{
+    PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
+    if (   pGip
+        && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC)
+    {
+        /*
+         * Since CPUs cannot be removed, we only have to update the IDs and
+         * indexes of CPUs that we think are inactive and the group member counts.
+         */
+        for (;;)
+        {
+            unsigned const cbGip          = pGip->cPages * PAGE_SIZE;
+            uint32_t const cGipActiveCpus = pGip->cOnlineCpus;
+            uint32_t const cMyActiveCpus  = ASMAtomicReadU32(&g_cRtMpWinActiveCpus);
+            ASMCompilerBarrier();
+
+            for (uint32_t idxGroup = 0; idxGroup < g_cRtMpWinMaxCpuGroups; idxGroup++)
+            {
+                uint32_t offCpuGroup = pGip->aoffCpuGroup[idxGroup];
+                if (offCpuGroup < cbGip)
+                {
+                    PSUPGIPCPUGROUP pGipCpuGrp  = (PSUPGIPCPUGROUP)((uintptr_t)pGip + offCpuGroup);
+                    uint32_t        cMaxMembers = pGipCpuGrp->cMaxMembers;
+                    AssertStmt(cMaxMembers <= RT_ELEMENTS(g_aRtMpWinCpuGroups[0].aidxCpuSetMembers),
+                               cMaxMembers  = RT_ELEMENTS(g_aRtMpWinCpuGroups[0].aidxCpuSetMembers));
+                    for (uint32_t idxMember = g_aRtMpWinCpuGroups[idxGroup].cActiveCpus; idxMember < cMaxMembers; idxMember++)
+                    {
+                        int16_t idxSet = pGipCpuGrp->aiCpuSetIdxs[idxMember];
+                        g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember] = idxSet;
+                        if ((unsigned)idxSet < RT_ELEMENTS(g_aidRtMpWinByCpuSetIdx))
+# ifdef IPRT_WITH_RTCPUID_AS_GROUP_AND_NUMBER
+                            g_aidRtMpWinByCpuSetIdx[idxSet] = RTMPCPUID_FROM_GROUP_AND_NUMBER(idxGroup, idxMember);
+# else
+                            g_aidRtMpWinByCpuSetIdx[idxSet] = idxSet;
+# endif
+                    }
+                    g_aRtMpWinCpuGroups[idxGroup].cMaxCpus    = RT_MIN(pGipCpuGrp->cMembers, cMaxMembers);
+                    g_aRtMpWinCpuGroups[idxGroup].cActiveCpus = RT_MIN(pGipCpuGrp->cMembers, cMaxMembers);
+                }
+                else
+                    Assert(g_aRtMpWinCpuGroups[idxGroup].cActiveCpus == 0);
+            }
+
+            ASMCompilerBarrier();
+            if (cGipActiveCpus == pGip->cOnlineCpus)
+                if (ASMAtomicCmpXchgU32(&g_cRtMpWinActiveCpus, cGipActiveCpus, cMyActiveCpus))
+                    break;
+        }
+    }
+}
+
+#endif /* IPRT_WITH_GIP_MP_INFO */
+
+
+/*
+ * Conversion between CPU ID and set index.
+ */
+
+RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+#ifdef IPRT_WITH_RTCPUID_AS_GROUP_AND_NUMBER
+    if (idCpu != NIL_RTCPUID)
+        return RTMpSetIndexFromCpuGroupMember(rtMpCpuIdGetGroup(idCpu), rtMpCpuIdGetGroupMember(idCpu));
+    return -1;
+
+#else
+    /* 1:1 mapping, just do range checking. */
+    return idCpu < g_cRtMpWinMaxCpus ? idCpu : -1;
+#endif
+}
+
+
+RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    if ((unsigned)iCpu < RT_ELEMENTS(g_aidRtMpWinByCpuSetIdx))
+    {
+        RTCPUID idCpu = g_aidRtMpWinByCpuSetIdx[iCpu];
+
+#if defined(IPRT_WITH_RTCPUID_AS_GROUP_AND_NUMBER) && defined(RT_STRICT)
+        /* Check the correctness of the mapping table. */
+        RTCPUID idCpuGip = NIL_RTCPUID;
+        if (   pGip
+            && (unsigned)iCpu < RT_ELEMENTS(pGip->aiCpuFromCpuSetIdx))
+        {
+            unsigned idxSupCpu = pGip->aiCpuFromCpuSetIdx[idxGuess];
+            if (idxSupCpu < pGip->cCpus)
+                if (pGip->aCPUs[idxSupCpu].enmState != SUPGIPCPUSTATE_INVALID)
+                    idCpuGip = pGip->aCPUs[idxSupCpu].idCpu;
+        }
+        AssertMsg(idCpu == idCpuGip, ("table:%#x  gip:%#x\n", idCpu, idCpuGip));
+#endif
+
+        return idCpu;
+    }
+    return NIL_RTCPUID;
+}
+
+
+RTDECL(int) RTMpSetIndexFromCpuGroupMember(uint32_t idxGroup, uint32_t idxMember)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    if (idxGroup < g_cRtMpWinMaxCpuGroups)
+        if (idxMember < g_aRtMpWinCpuGroups[idxGroup].cMaxCpus)
+            return g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember];
+    return -1;
+}
+
+
+RTDECL(uint32_t) RTMpGetCpuGroupCounts(uint32_t idxGroup, uint32_t *pcActive)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    if (idxGroup < g_cRtMpWinMaxCpuGroups)
+    {
+        if (pcActive)
+            *pcActive = g_aRtMpWinCpuGroups[idxGroup].cActiveCpus;
+        return g_aRtMpWinCpuGroups[idxGroup].cMaxCpus;
+    }
+    if (pcActive)
+        *pcActive = 0;
+    return 0;
+}
+
+
+RTDECL(uint32_t) RTMpGetMaxCpuGroupCount(void)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    return g_cRtMpWinMaxCpuGroups;
+}
+
+
+
+/*
+ * Get current CPU.
+ */
+
+RTDECL(RTCPUID) RTMpCpuId(void)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    PROCESSOR_NUMBER ProcNum;
+    ProcNum.Group = 0;
+    ProcNum.Number = 0xff;
+    if (g_pfnGetCurrentProcessorNumberEx)
+        g_pfnGetCurrentProcessorNumberEx(&ProcNum);
+    else if (g_pfnGetCurrentProcessorNumber)
+    {
+        DWORD iCpu = g_pfnGetCurrentProcessorNumber();
+        Assert(iCpu < g_cRtMpWinMaxCpus);
+        ProcNum.Number = iCpu;
+    }
+    else
+    {
+#if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
+        ProcNum.Number = ASMGetApicId();
+#else
+# error "Not ported to this architecture."
+        return NIL_RTCPUID;
+#endif
+    }
+
+#ifdef IPRT_WITH_RTCPUID_AS_GROUP_AND_NUMBER
+    return RTMPCPUID_FROM_GROUP_AND_NUMBER(ProcNum.Group, ProcNum.Number);
+#else
+    return RTMpSetIndexFromCpuGroupMember(ProcNum.Group, ProcNum.Number);
+#endif
+}
+
+
+/*
+ * Possible CPUs and cores.
+ */
+
+RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+#ifdef IPRT_WITH_RTCPUID_AS_GROUP_AND_NUMBER
+    return RTMPCPUID_FROM_GROUP_AND_NUMBER(g_cRtMpWinMaxCpuGroups - 1,
+                                           g_aRtMpWinCpuGroups[g_cRtMpWinMaxCpuGroups - 1].cMaxCpus - 1);
+#else
+    return g_cRtMpWinMaxCpus - 1;
+#endif
+}
+
+
+RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    /* Any CPU between 0 and g_cRtMpWinMaxCpus are possible. */
+    return idCpu < g_cRtMpWinMaxCpus;
+}
+
+
+RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
+{
+    RTCPUID iCpu = RTMpGetCount();
+    RTCpuSetEmpty(pSet);
+    while (iCpu-- > 0)
+        RTCpuSetAddByIndex(pSet, iCpu);
+    return pSet;
+}
+
+
+RTDECL(RTCPUID) RTMpGetCount(void)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    return g_cRtMpWinMaxCpus;
+}
+
+
+RTDECL(RTCPUID) RTMpGetCoreCount(void)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+    RTMPWIN_UPDATE_GIP_GLOBALS();
+
+    return g_cRtMpWinMaxCpuCores;
+}
+
+
+/*
+ * Online CPUs and cores.
+ */
+
+RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
+{
+    RTOnce(&g_MpInitOnce, rtMpWinInitOnce, NULL);
+
+#ifdef IPRT_WITH_GIP_MP_INFO
+    RTMPWIN_UPDATE_GIP_GLOBALS_AND_GET_PGIP();
+    if (pGip)
+    {
+        *pSet = pGip->OnlineCpuSet;
+        return pSet;
+    }
+#endif
+
+    if (g_pfnGetLogicalProcessorInformationEx)
+    {
+        /*
+         * Get the group relation info.
+         *
+         * In addition to the ASSUMPTIONS that are documented in rtMpWinInitOnce,
+         * we ASSUME that PROCESSOR_GROUP_INFO::MaximumProcessorCount gives the
+         * active processor mask width.
+         */
+        /** @todo this is not correct for WOW64   */
+        DWORD                                    cbInfo = g_cbRtMpWinGrpRelBuf;
+        SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *pInfo = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)alloca(cbInfo);
+        AssertFatalMsg(g_pfnGetLogicalProcessorInformationEx(RelationGroup, pInfo, &cbInfo) != FALSE,
+                       ("last error = %u, cbInfo = %u (in %u)\n", GetLastError(), cbInfo, g_cbRtMpWinGrpRelBuf));
+        AssertFatalMsg(pInfo->Relationship == RelationGroup,
+                       ("Relationship = %u, expected %u!\n", pInfo->Relationship, RelationGroup));
+        AssertFatalMsg(pInfo->Group.MaximumGroupCount == g_cRtMpWinMaxCpuGroups,
+                       ("MaximumGroupCount is %u, expected %u!\n", pInfo->Group.MaximumGroupCount, g_cRtMpWinMaxCpuGroups));
+
+        RTCpuSetEmpty(pSet);
+        for (uint32_t idxGroup = 0; idxGroup < pInfo->Group.MaximumGroupCount; idxGroup++)
+        {
+            Assert(pInfo->Group.GroupInfo[idxGroup].MaximumProcessorCount == g_aRtMpWinCpuGroups[idxGroup].cMaxCpus);
+            Assert(pInfo->Group.GroupInfo[idxGroup].ActiveProcessorCount  <= g_aRtMpWinCpuGroups[idxGroup].cMaxCpus);
+
+            KAFFINITY fActive = pInfo->Group.GroupInfo[idxGroup].ActiveProcessorMask;
+            if (fActive != 0)
+            {
+#ifdef RT_STRICT
+                uint32_t    cMembersLeft = pInfo->Group.GroupInfo[idxGroup].ActiveProcessorCount;
+#endif
+                int const   cMembers  = g_aRtMpWinCpuGroups[idxGroup].cMaxCpus;
+                for (int idxMember = 0; idxMember < cMembers; idxMember++)
+                {
+                    if (fActive & 1)
+                    {
+#ifdef RT_STRICT
+                        cMembersLeft--;
+#endif
+                        RTCpuSetAddByIndex(pSet, g_aRtMpWinCpuGroups[idxGroup].aidxCpuSetMembers[idxMember]);
+                        fActive >>= 1;
+                        if (!fActive)
+                            break;
+                    }
+                    else
+                    {
+                        fActive >>= 1;
+                    }
+                }
+                Assert(cMembersLeft == 0);
+            }
+            else
+                Assert(pInfo->Group.GroupInfo[idxGroup].ActiveProcessorCount == 0);
+        }
+
+        return pSet;
+    }
+
+    /*
+     * Legacy fallback code.
+     */
+    SYSTEM_INFO SysInfo;
+    GetSystemInfo(&SysInfo);
+    return RTCpuSetFromU64(pSet, SysInfo.dwActiveProcessorMask);
+}
+
+
+RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
+{
+    RTCPUSET Set;
+    return RTCpuSetIsMember(RTMpGetOnlineSet(&Set), idCpu);
+}
+
+
+RTDECL(RTCPUID) RTMpGetOnlineCount(void)
+{
+#ifdef IPRT_WITH_GIP_MP_INFO
+    RTMPWIN_UPDATE_GIP_GLOBALS_AND_GET_PGIP();
+    if (pGip)
+        return pGip->cOnlineCpus;
+#endif
+
+    RTCPUSET Set;
+    RTMpGetOnlineSet(&Set);
+    return RTCpuSetCount(&Set);
+}
+
+
+RTDECL(RTCPUID) RTMpGetOnlineCoreCount(void)
+{
+    /** @todo this isn't entirely correct, but whatever. */
+    return RTMpGetCoreCount();
+}
+
diff --git a/src/VBox/Runtime/r3/win/ntdll-mini-implib.def b/src/VBox/Runtime/r3/win/ntdll-mini-implib.def
new file mode 100644
index 00000000..b61f9e1e
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/ntdll-mini-implib.def
@@ -0,0 +1,149 @@
+; $Id: ntdll-mini-implib.def $
+;; @file
+; IPRT - Minimal NTDLL import library defintion file.
+;
+
+;
+; Copyright (C) 2010-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+LIBRARY ntdll.dll
+EXPORTS
+  ; Exported name                           - The name x86 name sought by the linker.
+  ;                                         - This needs to be defined as a symbol, we generate assembly.
+
+    CsrClientCallServer                   ;;= _CsrClientCallServer@16
+
+    NtAlertThread                         ;;= _NtAlertThread@4
+    NtAllocateVirtualMemory               ;;= _NtAllocateVirtualMemory@24
+    NtClearEvent                          ;;= _NtClearEvent@4
+    NtClose                               ;;= _NtClose@4
+    NtCreateEvent                         ;;= _NtCreateEvent@20
+    NtCreateFile                          ;;= _NtCreateFile@44
+    NtCreateSection                       ;;= _NtCreateSection@28
+    NtCreateSymbolicLinkObject            ;;= _NtCreateSymbolicLinkObject@16
+    NtDelayExecution                      ;;= _NtDelayExecution@8
+    NtDeviceIoControlFile                 ;;= _NtDeviceIoControlFile@40
+    NtDuplicateObject                     ;;= _NtDuplicateObject@28
+    NtEnumerateKey                        ;;= _NtEnumerateKey@24
+    NtFlushBuffersFile                    ;;= _NtFlushBuffersFile@8
+    NtFlushVirtualMemory                  ;;= _NtFlushVirtualMemory@16
+    NtFreeVirtualMemory                   ;;= _NtFreeVirtualMemory@16
+    NtGetContextThread                    ;;= _NtGetContextThread@8
+    NtMapViewOfSection                    ;;= _NtMapViewOfSection@40
+    NtOpenDirectoryObject                 ;;= _NtOpenDirectoryObject@12
+    NtOpenEvent                           ;;= _NtOpenEvent@12
+    NtOpenKey                             ;;= _NtOpenKey@12
+    NtOpenProcess                         ;;= _NtOpenProcess@16
+    NtOpenProcessToken                    ;;= _NtOpenProcessToken@12
+    NtOpenSymbolicLinkObject              ;;= _NtOpenSymbolicLinkObject@12
+    NtOpenThread                          ;;= _NtOpenThread@16
+    NtOpenThreadToken                     ;;= _NtOpenThreadToken@16
+    NtProtectVirtualMemory                ;;= _NtProtectVirtualMemory@20
+    NtQueryAttributesFile                 ;;= _NtQueryAttributesFile@8
+    NtQueryDirectoryFile                  ;;= _NtQueryDirectoryFile@44
+    NtQueryDirectoryObject                ;;= _NtQueryDirectoryObject@28
+    NtQueryFullAttributesFile             ;;= _NtQueryFullAttributesFile@8
+    NtQueryEvent                          ;;= _NtQueryEvent@20
+    NtQueryInformationFile                ;;= _NtQueryInformationFile@20
+    NtQueryInformationProcess             ;;= _NtQueryInformationProcess@20
+    NtQueryInformationThread              ;;= _NtQueryInformationThread@20
+    NtQueryInformationToken               ;;= _NtQueryInformationToken@20
+    NtQueryKey                            ;;= _NtQueryKey@20
+    NtQueryObject                         ;;= _NtQueryObject@20
+    NtQuerySection                        ;;= _NtQuerySection@20
+    NtQuerySecurityObject                 ;;= _NtQuerySecurityObject@20
+    NtQuerySymbolicLinkObject             ;;= _NtQuerySymbolicLinkObject@12
+    NtQuerySystemInformation              ;;= _NtQuerySystemInformation@16
+    NtQueryTimerResolution                ;;= _NtQueryTimerResolution@12
+    NtQueryValueKey                       ;;= _NtQueryValueKey@24
+    NtQueryVirtualMemory                  ;;= _NtQueryVirtualMemory@24
+    NtQueryVolumeInformationFile          ;;= _NtQueryVolumeInformationFile@20
+    NtReadFile                            ;;= _NtReadFile@36
+    NtReadVirtualMemory                   ;;= _NtReadVirtualMemory@20
+    NtResetEvent                          ;;= _NtResetEvent@8
+    NtResumeProcess                       ;;= _NtResumeProcess@4
+    NtResumeThread                        ;;= _NtResumeThread@8
+    NtSetContextThread                    ;;= _NtSetContextThread@8
+    NtSetEvent                            ;;= _NtSetEvent@8
+    NtSetInformationFile                  ;;= _NtSetInformationFile@20
+    NtSetInformationObject                ;;= _NtSetInformationObject@16
+    NtSetInformationProcess               ;;= _NtSetInformationProcess@16
+    NtSetInformationThread                ;;= _NtSetInformationThread@16
+    NtSetTimerResolution                  ;;= _NtSetTimerResolution@12
+    NtSuspendProcess                      ;;= _NtSuspendProcess@4
+    NtSuspendThread                       ;;= _NtSuspendThread@8
+    NtTerminateProcess                    ;;= _NtTerminateProcess@8
+    NtTerminateThread                     ;;= _NtTerminateThread@8
+    NtUnmapViewOfSection                  ;;= _NtUnmapViewOfSection@8
+    NtWaitForMultipleObjects              ;;= _NtWaitForMultipleObjects@20
+    NtWaitForSingleObject                 ;;= _NtWaitForSingleObject@12
+    NtWriteFile                           ;;= _NtWriteFile@36
+    NtWriteVirtualMemory                  ;;= _NtWriteVirtualMemory@20
+    NtYieldExecution                      ;;= _NtYieldExecution@0
+
+    LdrInitializeThunk                    ;;= _LdrInitializeThunk@12
+    LdrRegisterDllNotification            ;;= _LdrRegisterDllNotification@16
+    LdrLoadDll                            ;;= _LdrLoadDll@16
+    LdrUnloadDll                          ;;= _LdrUnloadDll@4
+    LdrGetDllHandle                       ;;= _LdrGetDllHandle@16
+    LdrGetDllHandleEx                     ;;= _LdrGetDllHandleEx@20
+    LdrGetDllHandleByMapping              ;;= _LdrGetDllHandleByMapping@8
+    LdrGetDllHandleByName                 ;;= _LdrGetDllHandleByName@12
+    LdrAddRefDll                          ;;= _LdrAddRefDll@8
+    LdrGetProcedureAddress                ;;= _LdrGetProcedureAddress@12
+    LdrGetProcedureAddressEx              ;;= _LdrGetProcedureAddressEx@16
+    LdrLockLoaderLock                     ;;= _LdrLockLoaderLock@12
+    LdrUnlockLoaderLock                   ;;= _LdrUnlockLoaderLock@8
+
+    RtlAddAccessAllowedAce                ;;= _RtlAddAccessAllowedAce@16
+    RtlAddAccessDeniedAce                 ;;= _RtlAddAccessDeniedAce@16
+    RtlAllocateHeap                       ;;= _RtlAllocateHeap@12
+    RtlCompactHeap                        ;;= _RtlCompactHeap@8
+    RtlCopySid                            ;;= _RtlCopySid@12
+    RtlCreateAcl                          ;;= _RtlCreateAcl@12
+    RtlCreateHeap                         ;;= _RtlCreateHeap@24
+    RtlCreateProcessParameters            ;;= _RtlCreateProcessParameters@40
+    RtlCreateSecurityDescriptor           ;;= _RtlCreateSecurityDescriptor@8
+    RtlCreateUserProcess                  ;;= _RtlCreateUserProcess@40
+    RtlCreateUserThread                   ;;= _RtlCreateUserThread@40
+    RtlDestroyProcessParameters           ;;= _RtlDestroyProcessParameters@4
+    RtlDosApplyFileIsolationRedirection_Ustr ;;= _RtlDosApplyFileIsolationRedirection_Ustr@36
+    RtlEqualSid                           ;;= _RtlEqualSid@8
+    RtlExitUserProcess                    ;;= _RtlExitUserProcess@4
+    RtlExitUserThread                     ;;= _RtlExitUserThread@4
+    RtlExpandEnvironmentStrings_U         ;;= _RtlExpandEnvironmentStrings_U@16
+    RtlFreeHeap                           ;;= _RtlFreeHeap@12
+    RtlFreeUnicodeString                  ;;= _RtlFreeUnicodeString@4
+    RtlGetLastNtStatus                    ;;= _RtlGetLastNtStatus@0
+    RtlGetLastWin32Error                  ;;= _RtlGetLastWin32Error@0
+    RtlGetVersion                         ;;= _RtlGetVersion@4
+    RtlInitializeSid                      ;;= _RtlInitializeSid@12
+    RtlNtStatusToDosError                 ;;= _RtlNtStatusToDosError@4
+    RtlReAllocateHeap                     ;;= _RtlReAllocateHeap@16
+    RtlRestoreLastWin32Error              ;;= _RtlRestoreLastWin32Error@4
+    RtlSetDaclSecurityDescriptor          ;;= _RtlSetDaclSecurityDescriptor@16
+    RtlSetLastWin32Error                  ;;= _RtlSetLastWin32Error@4
+    RtlSetLastWin32ErrorAndNtStatusFromNtStatus ;;= _RtlSetLastWin32ErrorAndNtStatusFromNtStatus@4
+    RtlSizeHeap                           ;;= _RtlSizeHeap@12
+    RtlSubAuthoritySid                    ;;= _RtlSubAuthoritySid@8
+    RtlQueryPerformanceCounter            ;;= _RtlQueryPerformanceCounter@4
+    RtlGetSystemTimePrecise               ;;= _RtlGetSystemTimePrecise@0
+
diff --git a/src/VBox/Runtime/r3/win/path-win.cpp b/src/VBox/Runtime/r3/win/path-win.cpp
new file mode 100644
index 00000000..5f072133
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/path-win.cpp
@@ -0,0 +1,755 @@
+/* $Id: path-win.cpp $ */
+/** @file
+ * IPRT - Path manipulation.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_PATH
+#include <iprt/win/windows.h>
+#include <iprt/win/shlobj.h>
+
+#include <iprt/path.h>
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/ldr.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/time.h>
+#include <iprt/utf16.h>
+#include "internal/path.h"
+#include "internal/fs.h"
+
+/* Needed for lazy loading SHGetFolderPathW in RTPathUserDocuments(). */
+typedef HRESULT WINAPI FNSHGETFOLDERPATHW(HWND, int, HANDLE, DWORD, LPWSTR);
+typedef FNSHGETFOLDERPATHW *PFNSHGETFOLDERPATHW;
+
+/**
+ * Get the real (no symlinks, no . or .. components) path, must exist.
+ *
+ * @returns iprt status code.
+ * @param   pszPath         The path to resolve.
+ * @param   pszRealPath     Where to store the real path.
+ * @param   cchRealPath     Size of the buffer.
+ */
+RTDECL(int) RTPathReal(const char *pszPath, char *pszRealPath, size_t cchRealPath)
+{
+    /*
+     * Convert to UTF-16, call Win32 APIs, convert back.
+     */
+    PRTUTF16 pwszPath;
+    int rc = RTPathWinFromUtf8(&pwszPath, pszPath, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        LPWSTR lpFile;
+        WCHAR  wsz[RTPATH_MAX];
+        rc = GetFullPathNameW((LPCWSTR)pwszPath, RT_ELEMENTS(wsz), &wsz[0], &lpFile);
+        if (rc > 0 && rc < RT_ELEMENTS(wsz))
+        {
+            /* Check that it exists. (Use RTPathAbs() to just resolve the name.) */
+            DWORD dwAttr = GetFileAttributesW(wsz);
+            if (dwAttr != INVALID_FILE_ATTRIBUTES)
+                rc = RTUtf16ToUtf8Ex((PRTUTF16)&wsz[0], RTSTR_MAX, &pszRealPath, cchRealPath, NULL);
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+        }
+        else if (rc <= 0)
+            rc = RTErrConvertFromWin32(GetLastError());
+        else
+            rc = VERR_FILENAME_TOO_LONG;
+
+        RTPathWinFree(pwszPath);
+    }
+    return rc;
+}
+
+#if 0
+/**
+ * Get the absolute path (no symlinks, no . or .. components), doesn't have to exit.
+ *
+ * @returns iprt status code.
+ * @param   pszPath         The path to resolve.
+ * @param   pszAbsPath      Where to store the absolute path.
+ * @param   cchAbsPath      Size of the buffer.
+ */
+RTDECL(int) RTPathAbs(const char *pszPath, char *pszAbsPath, size_t cchAbsPath)
+{
+    /*
+     * Validation.
+     */
+    AssertPtr(pszAbsPath);
+    AssertPtr(pszPath);
+    if (RT_UNLIKELY(!*pszPath))
+        return VERR_INVALID_PARAMETER;
+
+    /*
+     * Convert to UTF-16, call Win32 API, convert back.
+     */
+    LPWSTR pwszPath;
+    int rc = RTStrToUtf16(pszPath, &pwszPath);
+    if (!RT_SUCCESS(rc))
+        return (rc);
+
+    LPWSTR pwszFile; /* Ignored */
+    RTUTF16 wsz[RTPATH_MAX];
+    rc = GetFullPathNameW(pwszPath, RT_ELEMENTS(wsz), &wsz[0], &pwszFile);
+    if (rc > 0 && rc < RT_ELEMENTS(wsz))
+    {
+        size_t cch;
+        rc = RTUtf16ToUtf8Ex(&wsz[0], RTSTR_MAX, &pszAbsPath, cchAbsPath, &cch);
+        if (RT_SUCCESS(rc))
+        {
+# if 1 /** @todo This code is completely bonkers. */
+            /*
+             * Remove trailing slash if the path may be pointing to a directory.
+             * (See posix variant.)
+             */
+            if (    cch > 1
+                &&  RTPATH_IS_SLASH(pszAbsPath[cch - 1])
+                &&  !RTPATH_IS_VOLSEP(pszAbsPath[cch - 2])
+                &&  !RTPATH_IS_SLASH(pszAbsPath[cch - 2]))
+                pszAbsPath[cch - 1] = '\0';
+# endif
+        }
+    }
+    else if (rc <= 0)
+        rc = RTErrConvertFromWin32(GetLastError());
+    else
+        rc = VERR_FILENAME_TOO_LONG;
+
+    RTUtf16Free(pwszPath);
+    return rc;
+}
+#endif
+
+
+/**
+ * Gets the user home directory.
+ *
+ * @returns iprt status code.
+ * @param   pszPath     Buffer where to store the path.
+ * @param   cchPath     Buffer size in bytes.
+ */
+RTDECL(int) RTPathUserHome(char *pszPath, size_t cchPath)
+{
+    /*
+     * Validate input
+     */
+    AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
+    AssertReturn(cchPath, VERR_INVALID_PARAMETER);
+
+    RTUTF16 wszPath[RTPATH_MAX];
+    bool    fValidFolderPath = false;
+
+    /*
+     * Try with Windows XP+ functionality first.
+     */
+    RTLDRMOD hShell32;
+    int rc = RTLdrLoadSystem("Shell32.dll", true /*fNoUnload*/, &hShell32);
+    if (RT_SUCCESS(rc))
+    {
+        PFNSHGETFOLDERPATHW pfnSHGetFolderPathW;
+        rc = RTLdrGetSymbol(hShell32, "SHGetFolderPathW", (void**)&pfnSHGetFolderPathW);
+        if (RT_SUCCESS(rc))
+        {
+            HRESULT hrc = pfnSHGetFolderPathW(0, CSIDL_PROFILE, NULL, SHGFP_TYPE_CURRENT, wszPath);
+            fValidFolderPath = (hrc == S_OK);
+        }
+        RTLdrClose(hShell32);
+    }
+
+    DWORD   dwAttr;
+    if (    !fValidFolderPath
+        ||  (dwAttr = GetFileAttributesW(&wszPath[0])) == INVALID_FILE_ATTRIBUTES
+        ||  !(dwAttr & FILE_ATTRIBUTE_DIRECTORY))
+    {
+        /*
+         * Fall back to Windows specific environment variables. HOME is not used.
+         */
+        if (    !GetEnvironmentVariableW(L"USERPROFILE", &wszPath[0], RTPATH_MAX)
+            ||  (dwAttr = GetFileAttributesW(&wszPath[0])) == INVALID_FILE_ATTRIBUTES
+            ||  !(dwAttr & FILE_ATTRIBUTE_DIRECTORY))
+        {
+            /* %HOMEDRIVE%%HOMEPATH% */
+            if (!GetEnvironmentVariableW(L"HOMEDRIVE", &wszPath[0], RTPATH_MAX))
+                return VERR_PATH_NOT_FOUND;
+            size_t const cwc = RTUtf16Len(&wszPath[0]);
+            if (    !GetEnvironmentVariableW(L"HOMEPATH", &wszPath[cwc], RTPATH_MAX - (DWORD)cwc)
+                ||  (dwAttr = GetFileAttributesW(&wszPath[0])) == INVALID_FILE_ATTRIBUTES
+                ||  !(dwAttr & FILE_ATTRIBUTE_DIRECTORY))
+                return VERR_PATH_NOT_FOUND;
+        }
+    }
+
+    /*
+     * Convert and return.
+     */
+    return RTUtf16ToUtf8Ex(&wszPath[0], RTSTR_MAX, &pszPath, cchPath, NULL);
+}
+
+
+RTDECL(int) RTPathUserDocuments(char *pszPath, size_t cchPath)
+{
+    /*
+     * Validate input
+     */
+    AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
+    AssertReturn(cchPath, VERR_INVALID_PARAMETER);
+
+    RTLDRMOD hShell32;
+    int rc = RTLdrLoadSystem("Shell32.dll", true /*fNoUnload*/, &hShell32);
+    if (RT_SUCCESS(rc))
+    {
+        PFNSHGETFOLDERPATHW pfnSHGetFolderPathW;
+        rc = RTLdrGetSymbol(hShell32, "SHGetFolderPathW", (void**)&pfnSHGetFolderPathW);
+        if (RT_SUCCESS(rc))
+        {
+            RTUTF16 wszPath[RTPATH_MAX];
+            HRESULT hrc = pfnSHGetFolderPathW(0, CSIDL_PERSONAL, NULL, SHGFP_TYPE_CURRENT, wszPath);
+            if (   hrc == S_OK     /* Found */
+                || hrc == S_FALSE) /* Found, but doesn't exist */
+            {
+                /*
+                 * Convert and return.
+                 */
+                RTLdrClose(hShell32);
+                return RTUtf16ToUtf8Ex(&wszPath[0], RTSTR_MAX, &pszPath, cchPath, NULL);
+            }
+        }
+        RTLdrClose(hShell32);
+    }
+    return VERR_PATH_NOT_FOUND;
+}
+
+
+#if 0 /* use nt version of this */
+
+RTR3DECL(int) RTPathQueryInfo(const char *pszPath, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs)
+{
+    return RTPathQueryInfoEx(pszPath, pObjInfo, enmAdditionalAttribs, RTPATH_F_ON_LINK);
+}
+#endif
+#if 0
+
+
+RTR3DECL(int) RTPathQueryInfoEx(const char *pszPath, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs, uint32_t fFlags)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
+    AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pObjInfo, VERR_INVALID_POINTER);
+    AssertMsgReturn(    enmAdditionalAttribs >= RTFSOBJATTRADD_NOTHING
+                    &&  enmAdditionalAttribs <= RTFSOBJATTRADD_LAST,
+                    ("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs),
+                    VERR_INVALID_PARAMETER);
+    AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
+
+    /*
+     * Query file info.
+     */
+    uint32_t uReparseTag = RTFSMODE_SYMLINK_REPARSE_TAG;
+    WIN32_FILE_ATTRIBUTE_DATA Data;
+    PRTUTF16 pwszPath;
+    int rc = RTStrToUtf16(pszPath, &pwszPath);
+    if (RT_FAILURE(rc))
+        return rc;
+    if (!GetFileAttributesExW(pwszPath, GetFileExInfoStandard, &Data))
+    {
+        /* Fallback to FindFileFirst in case of sharing violation. */
+        if (GetLastError() == ERROR_SHARING_VIOLATION)
+        {
+            WIN32_FIND_DATAW FindData;
+            HANDLE hDir = FindFirstFileW(pwszPath, &FindData);
+            if (hDir == INVALID_HANDLE_VALUE)
+            {
+                rc = RTErrConvertFromWin32(GetLastError());
+                RTUtf16Free(pwszPath);
+                return rc;
+            }
+            FindClose(hDir);
+
+            Data.dwFileAttributes   = FindData.dwFileAttributes;
+            Data.ftCreationTime     = FindData.ftCreationTime;
+            Data.ftLastAccessTime   = FindData.ftLastAccessTime;
+            Data.ftLastWriteTime    = FindData.ftLastWriteTime;
+            Data.nFileSizeHigh      = FindData.nFileSizeHigh;
+            Data.nFileSizeLow       = FindData.nFileSizeLow;
+            uReparseTag             = FindData.dwReserved0;
+        }
+        else
+        {
+            rc = RTErrConvertFromWin32(GetLastError());
+            RTUtf16Free(pwszPath);
+            return rc;
+        }
+    }
+
+    /*
+     * Getting the information for the link target is a bit annoying and
+     * subject to the same access violation mess as above.. :/
+     */
+    /** @todo we're too lazy wrt to error paths here... */
+    if (   (Data.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
+        && ((fFlags & RTPATH_F_FOLLOW_LINK) || uReparseTag != RTFSMODE_SYMLINK_REPARSE_TAG))
+    {
+        HANDLE hFinal = CreateFileW(pwszPath,
+                                    GENERIC_READ,
+                                    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                                    NULL,
+                                    OPEN_EXISTING,
+                                    FILE_FLAG_BACKUP_SEMANTICS,
+                                    NULL);
+        if (hFinal != INVALID_HANDLE_VALUE)
+        {
+            BY_HANDLE_FILE_INFORMATION FileData;
+            if (GetFileInformationByHandle(hFinal, &FileData))
+            {
+                Data.dwFileAttributes   = FileData.dwFileAttributes;
+                Data.ftCreationTime     = FileData.ftCreationTime;
+                Data.ftLastAccessTime   = FileData.ftLastAccessTime;
+                Data.ftLastWriteTime    = FileData.ftLastWriteTime;
+                Data.nFileSizeHigh      = FileData.nFileSizeHigh;
+                Data.nFileSizeLow       = FileData.nFileSizeLow;
+                uReparseTag             = 0;
+            }
+            CloseHandle(hFinal);
+        }
+        else if (GetLastError() != ERROR_SHARING_VIOLATION)
+        {
+            rc = RTErrConvertFromWin32(GetLastError());
+            RTUtf16Free(pwszPath);
+            return rc;
+        }
+    }
+
+    RTUtf16Free(pwszPath);
+
+    /*
+     * Setup the returned data.
+     */
+    pObjInfo->cbObject    = ((uint64_t)Data.nFileSizeHigh << 32)
+                          |  (uint64_t)Data.nFileSizeLow;
+    pObjInfo->cbAllocated = pObjInfo->cbObject;
+
+    Assert(sizeof(uint64_t) == sizeof(Data.ftCreationTime));
+    RTTimeSpecSetNtTime(&pObjInfo->BirthTime,         *(uint64_t *)&Data.ftCreationTime);
+    RTTimeSpecSetNtTime(&pObjInfo->AccessTime,        *(uint64_t *)&Data.ftLastAccessTime);
+    RTTimeSpecSetNtTime(&pObjInfo->ModificationTime,  *(uint64_t *)&Data.ftLastWriteTime);
+    pObjInfo->ChangeTime  = pObjInfo->ModificationTime;
+
+    pObjInfo->Attr.fMode  = rtFsModeFromDos((Data.dwFileAttributes << RTFS_DOS_SHIFT) & RTFS_DOS_MASK_NT,
+                                            pszPath, strlen(pszPath), uReparseTag);
+
+    /*
+     * Requested attributes (we cannot provide anything actually).
+     */
+    switch (enmAdditionalAttribs)
+    {
+        case RTFSOBJATTRADD_NOTHING:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_NOTHING;
+            break;
+
+        case RTFSOBJATTRADD_UNIX:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX;
+            pObjInfo->Attr.u.Unix.uid             = ~0U;
+            pObjInfo->Attr.u.Unix.gid             = ~0U;
+            pObjInfo->Attr.u.Unix.cHardlinks      = 1;
+            pObjInfo->Attr.u.Unix.INodeIdDevice   = 0; /** @todo use volume serial number */
+            pObjInfo->Attr.u.Unix.INodeId         = 0; /** @todo use fileid (see GetFileInformationByHandle). */
+            pObjInfo->Attr.u.Unix.fFlags          = 0;
+            pObjInfo->Attr.u.Unix.GenerationId    = 0;
+            pObjInfo->Attr.u.Unix.Device          = 0;
+            break;
+
+        case RTFSOBJATTRADD_UNIX_OWNER:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_OWNER;
+            pObjInfo->Attr.u.UnixOwner.uid        = ~0U;
+            pObjInfo->Attr.u.UnixOwner.szName[0]  = '\0'; /** @todo return something sensible here. */
+            break;
+
+        case RTFSOBJATTRADD_UNIX_GROUP:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_GROUP;
+            pObjInfo->Attr.u.UnixGroup.gid        = ~0U;
+            pObjInfo->Attr.u.UnixGroup.szName[0]  = '\0';
+            break;
+
+        case RTFSOBJATTRADD_EASIZE:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_EASIZE;
+            pObjInfo->Attr.u.EASize.cb            = 0;
+            break;
+
+        default:
+            AssertMsgFailed(("Impossible!\n"));
+            return VERR_INTERNAL_ERROR;
+    }
+
+    return VINF_SUCCESS;
+}
+
+#endif /* using NT version*/
+
+
+RTR3DECL(int) RTPathSetTimes(const char *pszPath, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
+                             PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
+{
+    return RTPathSetTimesEx(pszPath, pAccessTime, pModificationTime, pChangeTime, pBirthTime, RTPATH_F_ON_LINK);
+}
+
+
+RTR3DECL(int) RTPathSetTimesEx(const char *pszPath, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
+                               PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime, uint32_t fFlags)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
+    AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
+    AssertPtrNullReturn(pAccessTime, VERR_INVALID_POINTER);
+    AssertPtrNullReturn(pModificationTime, VERR_INVALID_POINTER);
+    AssertPtrNullReturn(pChangeTime, VERR_INVALID_POINTER);
+    AssertPtrNullReturn(pBirthTime, VERR_INVALID_POINTER);
+    AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
+
+    /*
+     * Convert the path.
+     */
+    PRTUTF16 pwszPath;
+    int rc = RTPathWinFromUtf8(&pwszPath, pszPath, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        HANDLE hFile;
+        if (fFlags & RTPATH_F_FOLLOW_LINK)
+            hFile = CreateFileW(pwszPath,
+                                FILE_WRITE_ATTRIBUTES,   /* dwDesiredAccess */
+                                FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE, /* dwShareMode */
+                                NULL,                    /* security attribs */
+                                OPEN_EXISTING,           /* dwCreationDisposition */
+                                FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_NORMAL,
+                                NULL);
+        else
+        {
+/** @todo Symlink: Test RTPathSetTimesEx on Windows. (The code is disabled
+ *        because it's not tested yet.) */
+#if 0 //def FILE_FLAG_OPEN_REPARSE_POINT
+            hFile = CreateFileW(pwszPath,
+                                FILE_WRITE_ATTRIBUTES,   /* dwDesiredAccess */
+                                FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE, /* dwShareMode */
+                                NULL,                    /* security attribs */
+                                OPEN_EXISTING,           /* dwCreationDisposition */
+                                FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OPEN_REPARSE_POINT,
+                                NULL);
+
+            if (hFile == INVALID_HANDLE_VALUE && GetLastError() == ERROR_INVALID_PARAMETER)
+#endif
+                hFile = CreateFileW(pwszPath,
+                                    FILE_WRITE_ATTRIBUTES,   /* dwDesiredAccess */
+                                    FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE, /* dwShareMode */
+                                    NULL,                    /* security attribs */
+                                    OPEN_EXISTING,           /* dwCreationDisposition */
+                                    FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_NORMAL,
+                                    NULL);
+        }
+        if (hFile != INVALID_HANDLE_VALUE)
+        {
+            /*
+             * Check if it's a no-op.
+             */
+            if (!pAccessTime && !pModificationTime && !pBirthTime)
+                rc = VINF_SUCCESS;    /* NOP */
+            else
+            {
+                /*
+                 * Convert the input and call the API.
+                 */
+                FILETIME    CreationTimeFT;
+                PFILETIME   pCreationTimeFT = NULL;
+                if (pBirthTime)
+                    pCreationTimeFT = RTTimeSpecGetNtFileTime(pBirthTime, &CreationTimeFT);
+
+                FILETIME    LastAccessTimeFT;
+                PFILETIME   pLastAccessTimeFT = NULL;
+                if (pAccessTime)
+                    pLastAccessTimeFT = RTTimeSpecGetNtFileTime(pAccessTime, &LastAccessTimeFT);
+
+                FILETIME    LastWriteTimeFT;
+                PFILETIME   pLastWriteTimeFT = NULL;
+                if (pModificationTime)
+                    pLastWriteTimeFT = RTTimeSpecGetNtFileTime(pModificationTime, &LastWriteTimeFT);
+
+                if (SetFileTime(hFile, pCreationTimeFT, pLastAccessTimeFT, pLastWriteTimeFT))
+                    rc = VINF_SUCCESS;
+                else
+                {
+                    DWORD Err = GetLastError();
+                    rc = RTErrConvertFromWin32(Err);
+                    Log(("RTPathSetTimes('%s', %p, %p, %p, %p): SetFileTime failed with lasterr %d (%Rrc)\n",
+                         pszPath, pAccessTime, pModificationTime, pChangeTime, pBirthTime, Err, rc));
+                }
+            }
+            BOOL fRc = CloseHandle(hFile); Assert(fRc); NOREF(fRc);
+        }
+        else
+        {
+            DWORD Err = GetLastError();
+            rc = RTErrConvertFromWin32(Err);
+            Log(("RTPathSetTimes('%s',,,,): failed with %Rrc and lasterr=%u\n", pszPath, rc, Err));
+        }
+
+        RTPathWinFree(pwszPath);
+    }
+
+    LogFlow(("RTPathSetTimes(%p:{%s}, %p:{%RDtimespec}, %p:{%RDtimespec}, %p:{%RDtimespec}, %p:{%RDtimespec}): return %Rrc\n",
+             pszPath, pszPath, pAccessTime, pAccessTime, pModificationTime, pModificationTime,
+             pChangeTime, pChangeTime, pBirthTime, pBirthTime));
+    return rc;
+}
+
+
+
+
+/**
+ * Internal worker for RTFileRename and RTFileMove.
+ *
+ * @returns iprt status code.
+ * @param   pszSrc      The source filename.
+ * @param   pszDst      The destination filename.
+ * @param   fFlags      The windows MoveFileEx flags.
+ * @param   fFileType   The filetype. We use the RTFMODE filetypes here. If it's 0,
+ *                      anything goes. If it's RTFS_TYPE_DIRECTORY we'll check that the
+ *                      source is a directory. If Its RTFS_TYPE_FILE we'll check that it's
+ *                      not a directory (we are NOT checking whether it's a file).
+ */
+DECLHIDDEN(int) rtPathWin32MoveRename(const char *pszSrc, const char *pszDst, uint32_t fFlags, RTFMODE fFileType)
+{
+    /*
+     * Convert the strings.
+     */
+    PRTUTF16 pwszSrc;
+    int rc = RTPathWinFromUtf8(&pwszSrc, pszSrc, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        PRTUTF16 pwszDst;
+        rc = RTPathWinFromUtf8(&pwszDst, pszDst, 0 /*fFlags*/);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Check object type if requested.
+             * This is open to race conditions.
+             */
+            if (fFileType)
+            {
+                DWORD dwAttr = GetFileAttributesW(pwszSrc);
+                if (dwAttr == INVALID_FILE_ATTRIBUTES)
+                    rc = RTErrConvertFromWin32(GetLastError());
+                else if (RTFS_IS_DIRECTORY(fFileType))
+                    rc = dwAttr & FILE_ATTRIBUTE_DIRECTORY ? VINF_SUCCESS : VERR_NOT_A_DIRECTORY;
+                else
+                    rc = dwAttr & FILE_ATTRIBUTE_DIRECTORY ? VERR_IS_A_DIRECTORY : VINF_SUCCESS;
+            }
+            if (RT_SUCCESS(rc))
+            {
+                if (MoveFileExW(pwszSrc, pwszDst, fFlags))
+                    rc = VINF_SUCCESS;
+                else
+                {
+                    DWORD Err = GetLastError();
+                    rc = RTErrConvertFromWin32(Err);
+                    Log(("MoveFileExW('%s', '%s', %#x, %RTfmode): fails with rc=%Rrc & lasterr=%d\n",
+                         pszSrc, pszDst, fFlags, fFileType, rc, Err));
+                }
+            }
+            RTPathWinFree(pwszDst);
+        }
+        RTPathWinFree(pwszSrc);
+    }
+    return rc;
+}
+
+
+RTR3DECL(int) RTPathRename(const char *pszSrc, const char *pszDst, unsigned fRename)
+{
+    /*
+     * Validate input.
+     */
+    AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
+    AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
+    AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
+    AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
+
+    /*
+     * Call the worker.
+     */
+    int rc = rtPathWin32MoveRename(pszSrc, pszDst, fRename & RTPATHRENAME_FLAGS_REPLACE ? MOVEFILE_REPLACE_EXISTING : 0, 0);
+
+    LogFlow(("RTPathRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n", pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
+    return rc;
+}
+
+
+RTR3DECL(int) RTPathUnlink(const char *pszPath, uint32_t fUnlink)
+{
+    RT_NOREF_PV(pszPath); RT_NOREF_PV(fUnlink);
+    return VERR_NOT_IMPLEMENTED;
+}
+
+
+RTDECL(bool) RTPathExists(const char *pszPath)
+{
+    return RTPathExistsEx(pszPath, RTPATH_F_FOLLOW_LINK);
+}
+
+
+RTDECL(bool) RTPathExistsEx(const char *pszPath, uint32_t fFlags)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(pszPath, false);
+    AssertReturn(*pszPath, false);
+    Assert(RTPATH_F_IS_VALID(fFlags, 0));
+
+    /*
+     * Try query file info.
+     */
+    DWORD dwAttr;
+    PRTUTF16 pwszPath;
+    int rc = RTPathWinFromUtf8(&pwszPath, pszPath, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        dwAttr = GetFileAttributesW(pwszPath);
+        RTPathWinFree(pwszPath);
+    }
+    else
+        dwAttr = INVALID_FILE_ATTRIBUTES;
+    if (dwAttr == INVALID_FILE_ATTRIBUTES)
+        return false;
+
+#ifdef FILE_ATTRIBUTE_REPARSE_POINT
+    if (   (fFlags & RTPATH_F_FOLLOW_LINK)
+        && (dwAttr & FILE_ATTRIBUTE_REPARSE_POINT))
+    {
+        AssertFailed();
+        /** @todo Symlinks: RTPathExists+RTPathExistsEx is misbehaving on symbolic
+         *        links on Windows. */
+    }
+#endif
+
+    return true;
+}
+
+
+RTDECL(int) RTPathGetCurrent(char *pszPath, size_t cchPath)
+{
+    int rc;
+
+    if (cchPath > 0)
+    {
+        /*
+         * GetCurrentDirectory may in some cases omit the drive letter, according
+         * to MSDN, thus the GetFullPathName call.
+         */
+        RTUTF16 wszCurPath[RTPATH_MAX];
+        if (GetCurrentDirectoryW(RTPATH_MAX, wszCurPath))
+        {
+            RTUTF16 wszFullPath[RTPATH_MAX];
+            if (GetFullPathNameW(wszCurPath, RTPATH_MAX, wszFullPath, NULL))
+            {
+                if (   wszFullPath[1] == ':'
+                    && RT_C_IS_LOWER(wszFullPath[0]))
+                    wszFullPath[0] = RT_C_TO_UPPER(wszFullPath[0]);
+
+                rc = RTUtf16ToUtf8Ex(&wszFullPath[0], RTSTR_MAX, &pszPath, cchPath, NULL);
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+        rc = VERR_BUFFER_OVERFLOW;
+    return rc;
+}
+
+
+RTDECL(int) RTPathSetCurrent(const char *pszPath)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
+    AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
+
+    /*
+     * This interface is almost identical to the Windows API.
+     */
+    PRTUTF16 pwszPath;
+    int rc = RTPathWinFromUtf8(&pwszPath, pszPath, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        /** @todo improve the slash stripping a bit? */
+        size_t cwc = RTUtf16Len(pwszPath);
+        if (    cwc >= 2
+            &&  (   pwszPath[cwc - 1] == L'/'
+                 || pwszPath[cwc - 1] == L'\\')
+            &&  pwszPath[cwc - 2] != ':')
+            pwszPath[cwc - 1] = L'\0';
+
+        if (!SetCurrentDirectoryW(pwszPath))
+            rc = RTErrConvertFromWin32(GetLastError());
+
+        RTPathWinFree(pwszPath);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPathGetCurrentOnDrive(char chDrive, char *pszPath, size_t cbPath)
+{
+    int rc;
+    if (cbPath > 0)
+    {
+        WCHAR wszInput[4];
+        wszInput[0] = chDrive;
+        wszInput[1] = ':';
+        wszInput[2] = '\0';
+        RTUTF16 wszFullPath[RTPATH_MAX];
+        if (GetFullPathNameW(wszInput, RTPATH_MAX, wszFullPath, NULL))
+            rc = RTUtf16ToUtf8Ex(&wszFullPath[0], RTSTR_MAX, &pszPath, cbPath, NULL);
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+        rc = VERR_BUFFER_OVERFLOW;
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/pathint-win.cpp b/src/VBox/Runtime/r3/win/pathint-win.cpp
new file mode 100644
index 00000000..2de8c3ca
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/pathint-win.cpp
@@ -0,0 +1,194 @@
+/* $Id: pathint-win.cpp $ */
+/** @file
+ * IPRT - Windows, Internal Path stuff.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_FS
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+
+#include <iprt/nt/nt-and-windows.h>
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The max number of non-null characters we pass to an Win32 API.
+ * You would think that MAX_PATH gives this length, however CreateDirectoryW was
+ * found to fail on Windows 10 (1803++) if given a perfectly formed path argument
+ * of 248 or more characters.  Same when going thru UNC.
+ *
+ * So, to be conservative, we put the max number of characters in a non-\\?\
+ * path to 243, not counting the terminator.
+ */
+#define ACTUAL_MAX_PATH     243
+
+
+DECL_NO_INLINE(static, bool) rtPathWinTryConvertToAbs(PRTUTF16 *ppwszPath)
+{
+    RTUTF16 wszFullPath[MAX_PATH + 1];
+    DWORD cwcFull = GetFullPathNameW(*ppwszPath, MAX_PATH + 1, wszFullPath, NULL);
+    if (cwcFull <= ACTUAL_MAX_PATH)
+    {
+        RTUtf16Free(*ppwszPath);
+        PRTUTF16 const pwszCopy = RTUtf16Dup(wszFullPath);
+        *ppwszPath = pwszCopy;
+        if (pwszCopy)
+            return true;
+    }
+    return false;
+}
+
+
+RTDECL(int)  RTPathWinFromUtf8(PRTUTF16 *ppwszPath, const char *pszPath, uint32_t fFlags)
+{
+    Assert(fFlags == 0);
+    RT_NOREF(fFlags);
+
+    /*
+     * Do a straight conversion first.
+     */
+    *ppwszPath = NULL;
+    size_t cwcResult = 0;
+    int rc = RTStrToUtf16Ex(pszPath, RTSTR_MAX, ppwszPath, 0, &cwcResult);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Check the resulting length.  This is straight forward for absolute
+         * paths, but gets complicated for relative ones.
+         */
+        if (cwcResult <= ACTUAL_MAX_PATH)
+        {
+            if (RT_C_IS_ALPHA(pszPath[0]) && pszPath[1] == ':')
+            {
+                if (RTPATH_IS_SLASH(pszPath[2]))
+                    return VINF_SUCCESS;
+
+                /* Drive relative path.  Found no simple way of getting the current
+                   path of a drive, so we try convert it to an absolute path and see
+                   how that works out.  It is what the API we're calling will have to
+                   do anyway, so this should perform just as well. */
+                if (rtPathWinTryConvertToAbs(ppwszPath))
+                    return VINF_SUCCESS;
+            }
+            else if (RTPATH_IS_SLASH(pszPath[0]))
+            {
+                if (   RTPATH_IS_SLASH(pszPath[1])
+                    && !RTPATH_IS_SLASH(pszPath[2])
+                    && pszPath[2] != '\0')
+                {
+                    /* Passthru prefix '\\?\' is fine. */
+                    if (   pszPath[2] == '?'
+                        && !RTPATH_IS_SLASH(pszPath[3]))
+                        return VINF_SUCCESS;
+
+                    /* UNC requires a longer prefix ('\??\UNC\' instead of '\??\'), so
+                       subtract 3 chars from the max limit to be on the safe side.  */
+                    if (cwcResult <= ACTUAL_MAX_PATH - 3)
+                        return VINF_SUCCESS;
+                }
+                else
+                {
+                    /* Drive relative. Win32 will prepend a two letter drive specification. */
+                    if (cwcResult <= ACTUAL_MAX_PATH - 2)
+                        return VINF_SUCCESS;
+                }
+            }
+            else
+            {
+                /* Relative to CWD.  We can use the API to get it's current length.
+                   Any race conditions here is entirely  the caller's problem. */
+                size_t cwcCwd = GetCurrentDirectoryW(0, NULL);
+                if (cwcCwd + cwcResult <= ACTUAL_MAX_PATH - 1)
+                    return VINF_SUCCESS;
+            }
+        }
+        /*
+         * We're good if the caller already supplied the passthru/length prefix: '\\?\'
+         */
+        else if (   pszPath[1] == '?'
+                 && RTPATH_IS_SLASH(pszPath[3])
+                 && RTPATH_IS_SLASH(pszPath[1])
+                 && RTPATH_IS_SLASH(pszPath[0]))
+                 return VINF_SUCCESS;
+
+        /*
+         * Long path requiring \\?\ prefixing.
+         *
+         * We piggy back on the NT conversion here and ASSUME RTUtf16Free is the right
+         * way to free the result.
+         */
+        RTUtf16Free(*ppwszPath);
+        *ppwszPath = NULL;
+
+        struct _UNICODE_STRING  NtName   = { 0, 0, NULL };
+        HANDLE                  hRootDir = NULL;
+        rc = RTNtPathFromWinUtf8(&NtName, &hRootDir, pszPath);
+        if (RT_SUCCESS(rc))
+        {
+            /* No root dir handle. */
+            if (hRootDir == NULL)
+            {
+                /* Convert the NT '\??\' prefix to a win32 passthru prefix '\\?\' */
+                if (   NtName.Buffer[0] == '\\'
+                    && NtName.Buffer[1] == '?'
+                    && NtName.Buffer[2] == '?'
+                    && NtName.Buffer[3] == '\\')
+                {
+                    NtName.Buffer[1] = '\\';
+
+                    /* Zero termination paranoia. */
+                    if (NtName.Buffer[NtName.Length / sizeof(RTUTF16)] == '\0')
+                    {
+                        *ppwszPath = NtName.Buffer;
+                        return VINF_SUCCESS;
+                    }
+                    AssertMsgFailed(("Length=%u %.*ls\n", NtName.Length, NtName.Length / sizeof(RTUTF16), NtName.Buffer));
+                }
+                else
+                    AssertMsgFailed(("%ls\n", NtName.Buffer));
+            }
+            else
+                AssertMsgFailed(("%s\n", pszPath));
+            RTNtPathFree(&NtName, &hRootDir);
+        }
+    }
+    return rc;
+}
+
+
+RTDECL(void) RTPathWinFree(PRTUTF16 pwszPath)
+{
+    RTUtf16Free(pwszPath);
+}
+
diff --git a/src/VBox/Runtime/r3/win/pipe-win.cpp b/src/VBox/Runtime/r3/win/pipe-win.cpp
new file mode 100644
index 00000000..60c8afc5
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/pipe-win.cpp
@@ -0,0 +1,1451 @@
+/* $Id: pipe-win.cpp $ */
+/** @file
+ * IPRT - Anonymous Pipes, Windows Implementation.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/win/windows.h>
+
+#include <iprt/pipe.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/critsect.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/poll.h>
+#include <iprt/process.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+#include "internal/pipe.h"
+#include "internal/magics.h"
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The pipe buffer size we prefer. */
+#define RTPIPE_NT_SIZE      _64K
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef struct RTPIPEINTERNAL
+{
+    /** Magic value (RTPIPE_MAGIC). */
+    uint32_t            u32Magic;
+    /** The pipe handle. */
+    HANDLE              hPipe;
+    /** Set if this is the read end, clear if it's the write end. */
+    bool                fRead;
+    /** Set if there is already pending I/O. */
+    bool                fIOPending;
+    /** Set if the zero byte read that the poll code using is pending. */
+    bool                fZeroByteRead;
+    /** Set if the pipe is broken. */
+    bool                fBrokenPipe;
+    /** Set if we've promised that the handle is writable. */
+    bool                fPromisedWritable;
+    /** Set if created inheritable. */
+    bool                fCreatedInheritable;
+    /** Usage counter. */
+    uint32_t            cUsers;
+    /** The overlapped I/O structure we use. */
+    OVERLAPPED          Overlapped;
+    /** Bounce buffer for writes. */
+    uint8_t            *pbBounceBuf;
+    /** Amount of used buffer space. */
+    size_t              cbBounceBufUsed;
+    /** Amount of allocated buffer space. */
+    size_t              cbBounceBufAlloc;
+    /** The handle of the poll set currently polling on this pipe.
+     *  We can only have one poller at the time (lazy bird). */
+    RTPOLLSET           hPollSet;
+    /** Critical section protecting the above members.
+     * (Taking the lazy/simple approach.) */
+    RTCRITSECT          CritSect;
+    /** Buffer for the zero byte read. */
+    uint8_t             abBuf[8];
+} RTPIPEINTERNAL;
+
+
+/* from ntdef.h */
+typedef LONG NTSTATUS;
+
+/* from ntddk.h */
+typedef struct _IO_STATUS_BLOCK {
+    union {
+        NTSTATUS Status;
+        PVOID Pointer;
+    };
+    ULONG_PTR Information;
+} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
+
+typedef enum _FILE_INFORMATION_CLASS {
+    FilePipeInformation = 23,
+    FilePipeLocalInformation = 24,
+    FilePipeRemoteInformation = 25,
+} FILE_INFORMATION_CLASS, *PFILE_INFORMATION_CLASS;
+
+/* from ntifs.h */
+typedef struct _FILE_PIPE_LOCAL_INFORMATION {
+     ULONG NamedPipeType;
+     ULONG NamedPipeConfiguration;
+     ULONG MaximumInstances;
+     ULONG CurrentInstances;
+     ULONG InboundQuota;
+     ULONG ReadDataAvailable;
+     ULONG OutboundQuota;
+     ULONG WriteQuotaAvailable;
+     ULONG NamedPipeState;
+     ULONG NamedPipeEnd;
+} FILE_PIPE_LOCAL_INFORMATION, *PFILE_PIPE_LOCAL_INFORMATION;
+
+#define FILE_PIPE_DISCONNECTED_STATE    0x00000001U
+#define FILE_PIPE_LISTENING_STATE       0x00000002U
+#define FILE_PIPE_CONNECTED_STATE       0x00000003U
+#define FILE_PIPE_CLOSING_STATE         0x00000004U
+
+#define FILE_PIPE_INBOUND               0x00000000U
+#define FILE_PIPE_OUTBOUND              0x00000001U
+#define FILE_PIPE_FULL_DUPLEX           0x00000002U
+
+#define FILE_PIPE_CLIENT_END            0x00000000U
+#define FILE_PIPE_SERVER_END            0x00000001U
+
+extern "C" NTSYSAPI NTSTATUS WINAPI NtQueryInformationFile(HANDLE, PIO_STATUS_BLOCK, PVOID, LONG, FILE_INFORMATION_CLASS);
+
+
+/**
+ * Wrapper for getting FILE_PIPE_LOCAL_INFORMATION via the NT API.
+ *
+ * @returns Success indicator (true/false).
+ * @param   pThis               The pipe.
+ * @param   pInfo               The info structure.
+ */
+static bool rtPipeQueryNtInfo(RTPIPEINTERNAL *pThis, FILE_PIPE_LOCAL_INFORMATION *pInfo)
+{
+    IO_STATUS_BLOCK Ios;
+    RT_ZERO(Ios);
+    RT_ZERO(*pInfo);
+    NTSTATUS rcNt = NtQueryInformationFile(pThis->hPipe, &Ios, pInfo, sizeof(*pInfo), FilePipeLocalInformation);
+    return rcNt >= 0;
+}
+
+
+RTDECL(int)  RTPipeCreate(PRTPIPE phPipeRead, PRTPIPE phPipeWrite, uint32_t fFlags)
+{
+    AssertPtrReturn(phPipeRead, VERR_INVALID_POINTER);
+    AssertPtrReturn(phPipeWrite, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTPIPE_C_VALID_MASK), VERR_INVALID_PARAMETER);
+
+    /*
+     * Create the read end of the pipe.
+     */
+    DWORD   dwErr;
+    HANDLE  hPipeR;
+    HANDLE  hPipeW;
+    int     rc;
+    for (;;)
+    {
+        static volatile uint32_t    g_iNextPipe = 0;
+        char                        szName[128];
+        RTStrPrintf(szName, sizeof(szName), "\\\\.\\pipe\\iprt-pipe-%u-%u", RTProcSelf(), ASMAtomicIncU32(&g_iNextPipe));
+
+        SECURITY_ATTRIBUTES  SecurityAttributes;
+        PSECURITY_ATTRIBUTES pSecurityAttributes = NULL;
+        if (fFlags & RTPIPE_C_INHERIT_READ)
+        {
+            SecurityAttributes.nLength              = sizeof(SecurityAttributes);
+            SecurityAttributes.lpSecurityDescriptor = NULL;
+            SecurityAttributes.bInheritHandle       = TRUE;
+            pSecurityAttributes = &SecurityAttributes;
+        }
+
+        DWORD dwOpenMode = PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED;
+#ifdef FILE_FLAG_FIRST_PIPE_INSTANCE
+        dwOpenMode |= FILE_FLAG_FIRST_PIPE_INSTANCE;
+#endif
+
+        DWORD dwPipeMode = PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT;
+#ifdef PIPE_REJECT_REMOTE_CLIENTS
+        dwPipeMode |= PIPE_REJECT_REMOTE_CLIENTS;
+#endif
+
+        hPipeR = CreateNamedPipeA(szName, dwOpenMode, dwPipeMode, 1 /*nMaxInstances*/, RTPIPE_NT_SIZE, RTPIPE_NT_SIZE,
+                                  NMPWAIT_USE_DEFAULT_WAIT, pSecurityAttributes);
+#ifdef PIPE_REJECT_REMOTE_CLIENTS
+        if (hPipeR == INVALID_HANDLE_VALUE && GetLastError() == ERROR_INVALID_PARAMETER)
+        {
+            dwPipeMode &= ~PIPE_REJECT_REMOTE_CLIENTS;
+            hPipeR = CreateNamedPipeA(szName, dwOpenMode, dwPipeMode, 1 /*nMaxInstances*/, RTPIPE_NT_SIZE, RTPIPE_NT_SIZE,
+                                      NMPWAIT_USE_DEFAULT_WAIT, pSecurityAttributes);
+        }
+#endif
+#ifdef FILE_FLAG_FIRST_PIPE_INSTANCE
+        if (hPipeR == INVALID_HANDLE_VALUE && GetLastError() == ERROR_INVALID_PARAMETER)
+        {
+            dwOpenMode &= ~FILE_FLAG_FIRST_PIPE_INSTANCE;
+            hPipeR = CreateNamedPipeA(szName, dwOpenMode, dwPipeMode, 1 /*nMaxInstances*/, RTPIPE_NT_SIZE, RTPIPE_NT_SIZE,
+                                      NMPWAIT_USE_DEFAULT_WAIT, pSecurityAttributes);
+        }
+#endif
+        if (hPipeR != INVALID_HANDLE_VALUE)
+        {
+            /*
+             * Connect to the pipe (the write end).
+             * We add FILE_READ_ATTRIBUTES here to make sure we can query the
+             * pipe state later on.
+             */
+            pSecurityAttributes = NULL;
+            if (fFlags & RTPIPE_C_INHERIT_WRITE)
+            {
+                SecurityAttributes.nLength              = sizeof(SecurityAttributes);
+                SecurityAttributes.lpSecurityDescriptor = NULL;
+                SecurityAttributes.bInheritHandle       = TRUE;
+                pSecurityAttributes = &SecurityAttributes;
+            }
+
+            hPipeW = CreateFileA(szName,
+                                 GENERIC_WRITE | FILE_READ_ATTRIBUTES /*dwDesiredAccess*/,
+                                 0 /*dwShareMode*/,
+                                 pSecurityAttributes,
+                                 OPEN_EXISTING /* dwCreationDisposition */,
+                                 FILE_FLAG_OVERLAPPED /*dwFlagsAndAttributes*/,
+                                 NULL /*hTemplateFile*/);
+            if (hPipeW != INVALID_HANDLE_VALUE)
+                break;
+            dwErr = GetLastError();
+            CloseHandle(hPipeR);
+        }
+        else
+            dwErr = GetLastError();
+        if (   dwErr != ERROR_PIPE_BUSY     /* already exist - compatible */
+            && dwErr != ERROR_ACCESS_DENIED /* already exist - incompatible */)
+            return RTErrConvertFromWin32(dwErr);
+        /* else: try again with a new name */
+    }
+
+    /*
+     * Create the two handles.
+     */
+    RTPIPEINTERNAL *pThisR = (RTPIPEINTERNAL *)RTMemAllocZ(sizeof(RTPIPEINTERNAL));
+    if (pThisR)
+    {
+        RTPIPEINTERNAL *pThisW = (RTPIPEINTERNAL *)RTMemAllocZ(sizeof(RTPIPEINTERNAL));
+        if (pThisW)
+        {
+            rc = RTCritSectInit(&pThisR->CritSect);
+            if (RT_SUCCESS(rc))
+            {
+                rc = RTCritSectInit(&pThisW->CritSect);
+                if (RT_SUCCESS(rc))
+                {
+                    pThisR->Overlapped.hEvent = CreateEvent(NULL, TRUE /*fManualReset*/,
+                                                            TRUE /*fInitialState*/, NULL /*pName*/);
+                    if (pThisR->Overlapped.hEvent != NULL)
+                    {
+                        pThisW->Overlapped.hEvent = CreateEvent(NULL, TRUE /*fManualReset*/,
+                                                                TRUE /*fInitialState*/, NULL /*pName*/);
+                        if (pThisW->Overlapped.hEvent != NULL)
+                        {
+                            pThisR->u32Magic            = RTPIPE_MAGIC;
+                            pThisW->u32Magic            = RTPIPE_MAGIC;
+                            pThisR->hPipe               = hPipeR;
+                            pThisW->hPipe               = hPipeW;
+                            pThisR->fRead               = true;
+                            pThisW->fRead               = false;
+                            //pThisR->fIOPending        = false;
+                            //pThisW->fIOPending        = false;
+                            //pThisR->fZeroByteRead     = false;
+                            //pThisW->fZeroByteRead     = false;
+                            //pThisR->fBrokenPipe       = false;
+                            //pThisW->fBrokenPipe       = false;
+                            //pThisW->fPromisedWritable = false;
+                            //pThisR->fPromisedWritable = false;
+                            pThisW->fCreatedInheritable = RT_BOOL(fFlags & RTPIPE_C_INHERIT_WRITE);
+                            pThisR->fCreatedInheritable = RT_BOOL(fFlags & RTPIPE_C_INHERIT_READ);
+                            //pThisR->cUsers            = 0;
+                            //pThisW->cUsers            = 0;
+                            //pThisR->pbBounceBuf       = NULL;
+                            //pThisW->pbBounceBuf       = NULL;
+                            //pThisR->cbBounceBufUsed   = 0;
+                            //pThisW->cbBounceBufUsed   = 0;
+                            //pThisR->cbBounceBufAlloc  = 0;
+                            //pThisW->cbBounceBufAlloc  = 0;
+                            pThisR->hPollSet            = NIL_RTPOLLSET;
+                            pThisW->hPollSet            = NIL_RTPOLLSET;
+
+                            *phPipeRead  = pThisR;
+                            *phPipeWrite = pThisW;
+                            return VINF_SUCCESS;
+                        }
+                        CloseHandle(pThisR->Overlapped.hEvent);
+                    }
+                    RTCritSectDelete(&pThisW->CritSect);
+                }
+                RTCritSectDelete(&pThisR->CritSect);
+            }
+            RTMemFree(pThisW);
+        }
+        else
+            rc = VERR_NO_MEMORY;
+        RTMemFree(pThisR);
+    }
+    else
+        rc = VERR_NO_MEMORY;
+
+    CloseHandle(hPipeR);
+    CloseHandle(hPipeW);
+    return rc;
+}
+
+
+/**
+ * Common worker for handling I/O completion.
+ *
+ * This is used by RTPipeClose, RTPipeWrite and RTPipeWriteBlocking.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The pipe instance handle.
+ */
+static int rtPipeWriteCheckCompletion(RTPIPEINTERNAL *pThis)
+{
+    int rc;
+    DWORD dwRc = WaitForSingleObject(pThis->Overlapped.hEvent, 0);
+    if (dwRc == WAIT_OBJECT_0)
+    {
+        DWORD cbWritten = 0;
+        if (GetOverlappedResult(pThis->hPipe, &pThis->Overlapped, &cbWritten, TRUE))
+        {
+            for (;;)
+            {
+                if (cbWritten >= pThis->cbBounceBufUsed)
+                {
+                    pThis->fIOPending = false;
+                    rc = VINF_SUCCESS;
+                    break;
+                }
+
+                /* resubmit the remainder of the buffer - can this actually happen? */
+                memmove(&pThis->pbBounceBuf[0], &pThis->pbBounceBuf[cbWritten], pThis->cbBounceBufUsed - cbWritten);
+                rc = ResetEvent(pThis->Overlapped.hEvent); Assert(rc == TRUE);
+                if (!WriteFile(pThis->hPipe, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed,
+                               &cbWritten, &pThis->Overlapped))
+                {
+                    if (GetLastError() == ERROR_IO_PENDING)
+                        rc = VINF_TRY_AGAIN;
+                    else
+                    {
+                        pThis->fIOPending = false;
+                        if (GetLastError() == ERROR_NO_DATA)
+                            rc = VERR_BROKEN_PIPE;
+                        else
+                            rc = RTErrConvertFromWin32(GetLastError());
+                        if (rc == VERR_BROKEN_PIPE)
+                            pThis->fBrokenPipe = true;
+                    }
+                    break;
+                }
+                Assert(cbWritten > 0);
+            }
+        }
+        else
+        {
+            pThis->fIOPending = false;
+            rc = RTErrConvertFromWin32(GetLastError());
+        }
+    }
+    else if (dwRc == WAIT_TIMEOUT)
+        rc = VINF_TRY_AGAIN;
+    else
+    {
+        pThis->fIOPending = false;
+        if (dwRc == WAIT_ABANDONED)
+            rc = VERR_INVALID_HANDLE;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    return rc;
+}
+
+
+
+RTDECL(int)  RTPipeClose(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    if (pThis == NIL_RTPIPE)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Do the cleanup.
+     */
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTPIPE_MAGIC, RTPIPE_MAGIC), VERR_INVALID_HANDLE);
+    RTCritSectEnter(&pThis->CritSect);
+    Assert(pThis->cUsers == 0);
+
+    if (!pThis->fRead && pThis->fIOPending)
+        rtPipeWriteCheckCompletion(pThis);
+
+    CloseHandle(pThis->hPipe);
+    pThis->hPipe = INVALID_HANDLE_VALUE;
+
+    CloseHandle(pThis->Overlapped.hEvent);
+    pThis->Overlapped.hEvent = NULL;
+
+    RTMemFree(pThis->pbBounceBuf);
+    pThis->pbBounceBuf = NULL;
+
+    RTCritSectLeave(&pThis->CritSect);
+    RTCritSectDelete(&pThis->CritSect);
+
+    RTMemFree(pThis);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTPipeFromNative(PRTPIPE phPipe, RTHCINTPTR hNativePipe, uint32_t fFlags)
+{
+    AssertPtrReturn(phPipe, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTPIPE_N_VALID_MASK), VERR_INVALID_PARAMETER);
+    AssertReturn(!!(fFlags & RTPIPE_N_READ) != !!(fFlags & RTPIPE_N_WRITE), VERR_INVALID_PARAMETER);
+
+    /*
+     * Get and validate the pipe handle info.
+     */
+    HANDLE hNative = (HANDLE)hNativePipe;
+    AssertReturn(GetFileType(hNative) == FILE_TYPE_PIPE, VERR_INVALID_HANDLE);
+
+    DWORD cMaxInstances;
+    DWORD fInfo;
+    if (!GetNamedPipeInfo(hNative, &fInfo, NULL, NULL, &cMaxInstances))
+        return RTErrConvertFromWin32(GetLastError());
+    /* Doesn't seem to matter to much if the pipe is message or byte type. Cygwin
+       seems to hand us such pipes when capturing output (@bugref{9397}), so just
+       ignore skip this check:
+    AssertReturn(!(fInfo & PIPE_TYPE_MESSAGE), VERR_INVALID_HANDLE); */
+    AssertReturn(cMaxInstances == 1, VERR_INVALID_HANDLE);
+
+    DWORD cInstances;
+    DWORD fState;
+    if (!GetNamedPipeHandleState(hNative, &fState, &cInstances, NULL, NULL, NULL, 0))
+        return RTErrConvertFromWin32(GetLastError());
+    AssertReturn(!(fState & PIPE_NOWAIT), VERR_INVALID_HANDLE);
+    AssertReturn(!(fState & PIPE_READMODE_MESSAGE), VERR_INVALID_HANDLE);
+    AssertReturn(cInstances <= 1, VERR_INVALID_HANDLE);
+
+    /*
+     * Looks kind of OK, create a handle so we can try rtPipeQueryNtInfo on it
+     * and see if we need to duplicate it to make that call work.
+     */
+    RTPIPEINTERNAL *pThis = (RTPIPEINTERNAL *)RTMemAllocZ(sizeof(RTPIPEINTERNAL));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+    int rc = RTCritSectInit(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        pThis->Overlapped.hEvent = CreateEvent(NULL, TRUE /*fManualReset*/,
+                                               TRUE /*fInitialState*/, NULL /*pName*/);
+        if (pThis->Overlapped.hEvent != NULL)
+        {
+            pThis->u32Magic             = RTPIPE_MAGIC;
+            pThis->hPipe                = hNative;
+            pThis->fRead                = !!(fFlags & RTPIPE_N_READ);
+            //pThis->fIOPending         = false;
+            //pThis->fZeroByteRead      = false;
+            //pThis->fBrokenPipe        = false;
+            //pThis->fPromisedWritable  = false;
+            pThis->fCreatedInheritable  = RT_BOOL(fFlags & RTPIPE_N_INHERIT);
+            //pThis->cUsers             = 0;
+            //pThis->pbBounceBuf        = NULL;
+            //pThis->cbBounceBufUsed    = 0;
+            //pThis->cbBounceBufAlloc   = 0;
+            pThis->hPollSet             = NIL_RTPOLLSET;
+
+            HANDLE                      hNative2 = INVALID_HANDLE_VALUE;
+            FILE_PIPE_LOCAL_INFORMATION Info;
+            RT_ZERO(Info);
+            if (   g_enmWinVer != kRTWinOSType_NT310
+                && rtPipeQueryNtInfo(pThis, &Info))
+                rc = VINF_SUCCESS;
+            else
+            {
+                if (DuplicateHandle(GetCurrentProcess() /*hSrcProcess*/, hNative /*hSrcHandle*/,
+                                    GetCurrentProcess() /*hDstProcess*/, &hNative2 /*phDstHandle*/,
+                                    pThis->fRead ? GENERIC_READ : GENERIC_WRITE | FILE_READ_ATTRIBUTES /*dwDesiredAccess*/,
+                                    !!(fFlags & RTPIPE_N_INHERIT) /*fInheritHandle*/,
+                                    0 /*dwOptions*/))
+                {
+                    pThis->hPipe = hNative2;
+                    if (rtPipeQueryNtInfo(pThis, &Info))
+                        rc = VINF_SUCCESS;
+                    else
+                    {
+                        rc = VERR_ACCESS_DENIED;
+                        CloseHandle(hNative2);
+                    }
+                }
+                else
+                    hNative2 = INVALID_HANDLE_VALUE;
+            }
+            if (RT_SUCCESS(rc))
+            {
+                /*
+                 * Verify the pipe state and correct the inheritability.
+                 */
+                AssertStmt(   Info.NamedPipeState == FILE_PIPE_CONNECTED_STATE
+                           || Info.NamedPipeState == FILE_PIPE_CLOSING_STATE
+                           || Info.NamedPipeState == FILE_PIPE_DISCONNECTED_STATE,
+                           VERR_INVALID_HANDLE);
+                AssertStmt(      Info.NamedPipeConfiguration
+                              == (   Info.NamedPipeEnd == FILE_PIPE_SERVER_END
+                                  ? (pThis->fRead ? FILE_PIPE_INBOUND  : FILE_PIPE_OUTBOUND)
+                                  : (pThis->fRead ? FILE_PIPE_OUTBOUND : FILE_PIPE_INBOUND) )
+                           || Info.NamedPipeConfiguration == FILE_PIPE_FULL_DUPLEX,
+                           VERR_INVALID_HANDLE);
+                if (   RT_SUCCESS(rc)
+                    && hNative2 == INVALID_HANDLE_VALUE
+                    && !SetHandleInformation(hNative,
+                                             HANDLE_FLAG_INHERIT /*dwMask*/,
+                                             fFlags & RTPIPE_N_INHERIT ? HANDLE_FLAG_INHERIT : 0))
+                {
+                    rc = RTErrConvertFromWin32(GetLastError());
+                    AssertMsgFailed(("%Rrc\n", rc));
+                }
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Ok, we're good!  If we replaced the handle, make sure it's not a standard
+                     * handle if we think we need to close it.
+                     */
+                    if (hNative2 != INVALID_HANDLE_VALUE)
+                    {
+                        if (   hNative != GetStdHandle(STD_INPUT_HANDLE)
+                            && hNative != GetStdHandle(STD_OUTPUT_HANDLE)
+                            && hNative != GetStdHandle(STD_ERROR_HANDLE))
+                            CloseHandle(hNative);
+                    }
+                    *phPipe = pThis;
+                    return VINF_SUCCESS;
+                }
+            }
+
+            /* Bail out. */
+            if (hNative2 != INVALID_HANDLE_VALUE)
+                CloseHandle(hNative2);
+            CloseHandle(pThis->Overlapped.hEvent);
+        }
+        RTCritSectDelete(&pThis->CritSect);
+    }
+    RTMemFree(pThis);
+    return rc;
+}
+
+
+RTDECL(RTHCINTPTR) RTPipeToNative(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, -1);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, -1);
+
+    return (RTHCINTPTR)pThis->hPipe;
+}
+
+
+RTDECL(int) RTPipeGetCreationInheritability(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, false);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, false);
+
+    return pThis->fCreatedInheritable;
+}
+
+
+RTDECL(int) RTPipeRead(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pcbRead);
+    AssertPtr(pvBuf);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        /* No concurrent readers, sorry. */
+        if (pThis->cUsers == 0)
+        {
+            pThis->cUsers++;
+
+            /*
+             * Kick of a an overlapped read.  It should return immediately if
+             * there is bytes in the buffer.  If not, we'll cancel it and see
+             * what we get back.
+             */
+            rc = ResetEvent(pThis->Overlapped.hEvent); Assert(rc == TRUE);
+            DWORD cbRead = 0;
+            if (   cbToRead == 0
+                || ReadFile(pThis->hPipe, pvBuf,
+                            cbToRead <= ~(DWORD)0 ? (DWORD)cbToRead : ~(DWORD)0,
+                            &cbRead, &pThis->Overlapped))
+            {
+                *pcbRead = cbRead;
+                rc = VINF_SUCCESS;
+            }
+            else if (GetLastError() == ERROR_IO_PENDING)
+            {
+                pThis->fIOPending = true;
+                RTCritSectLeave(&pThis->CritSect);
+
+                if (!CancelIo(pThis->hPipe))
+                    WaitForSingleObject(pThis->Overlapped.hEvent, INFINITE);
+                if (GetOverlappedResult(pThis->hPipe, &pThis->Overlapped, &cbRead, TRUE /*fWait*/))
+                {
+                    *pcbRead = cbRead;
+                    rc = VINF_SUCCESS;
+                }
+                else if (GetLastError() == ERROR_OPERATION_ABORTED)
+                {
+                    *pcbRead = 0;
+                    rc = VINF_TRY_AGAIN;
+                }
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+
+                RTCritSectEnter(&pThis->CritSect);
+                pThis->fIOPending = false;
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+            if (rc == VERR_BROKEN_PIPE)
+                pThis->fBrokenPipe = true;
+
+            pThis->cUsers--;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        RTCritSectLeave(&pThis->CritSect);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeReadBlocking(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pvBuf);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        /* No concurrent readers, sorry. */
+        if (pThis->cUsers == 0)
+        {
+            pThis->cUsers++;
+
+            size_t cbTotalRead = 0;
+            while (cbToRead > 0)
+            {
+                /*
+                 * Kick of a an overlapped read.  It should return immediately if
+                 * there is bytes in the buffer.  If not, we'll cancel it and see
+                 * what we get back.
+                 */
+                rc = ResetEvent(pThis->Overlapped.hEvent); Assert(rc == TRUE);
+                DWORD cbRead = 0;
+                pThis->fIOPending = true;
+                RTCritSectLeave(&pThis->CritSect);
+
+                if (ReadFile(pThis->hPipe, pvBuf,
+                             cbToRead <= ~(DWORD)0 ? (DWORD)cbToRead : ~(DWORD)0,
+                             &cbRead, &pThis->Overlapped))
+                    rc = VINF_SUCCESS;
+                else if (GetLastError() == ERROR_IO_PENDING)
+                {
+                    WaitForSingleObject(pThis->Overlapped.hEvent, INFINITE);
+                    if (GetOverlappedResult(pThis->hPipe, &pThis->Overlapped, &cbRead, TRUE /*fWait*/))
+                        rc = VINF_SUCCESS;
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+                }
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+
+                RTCritSectEnter(&pThis->CritSect);
+                pThis->fIOPending = false;
+                if (RT_FAILURE(rc))
+                    break;
+
+                /* advance */
+                cbToRead    -= cbRead;
+                cbTotalRead += cbRead;
+                pvBuf        = (uint8_t *)pvBuf + cbRead;
+            }
+
+            if (rc == VERR_BROKEN_PIPE)
+                pThis->fBrokenPipe = true;
+
+            if (pcbRead)
+            {
+                *pcbRead = cbTotalRead;
+                if (   RT_FAILURE(rc)
+                    && cbTotalRead
+                    && rc != VERR_INVALID_POINTER)
+                    rc = VINF_SUCCESS;
+            }
+
+            pThis->cUsers--;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        RTCritSectLeave(&pThis->CritSect);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeWrite(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pcbWritten);
+    AssertPtr(pvBuf);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        /* No concurrent writers, sorry. */
+        if (pThis->cUsers == 0)
+        {
+            pThis->cUsers++;
+
+            /* If I/O is pending, check if it has completed. */
+            if (pThis->fIOPending)
+                rc = rtPipeWriteCheckCompletion(pThis);
+            else
+                rc = VINF_SUCCESS;
+            if (rc == VINF_SUCCESS)
+            {
+                Assert(!pThis->fIOPending);
+
+                /* Adjust the number of bytes to write to fit into the current
+                   buffer quota, unless we've promised stuff in RTPipeSelectOne.
+                   WriteQuotaAvailable better not be zero when it shouldn't!! */
+                FILE_PIPE_LOCAL_INFORMATION Info;
+                if (   !pThis->fPromisedWritable
+                    && cbToWrite > 0
+                    && rtPipeQueryNtInfo(pThis, &Info))
+                {
+                    if (Info.NamedPipeState == FILE_PIPE_CLOSING_STATE)
+                        rc = VERR_BROKEN_PIPE;
+                    /** @todo fixme: To get the pipe writing support to work the
+                     *               block below needs to be commented out until a
+                     *               way is found to address the problem of the incorrectly
+                     *               set field Info.WriteQuotaAvailable. */
+#if 0
+                    else if (   cbToWrite >= Info.WriteQuotaAvailable
+                             && Info.OutboundQuota != 0
+                             && (Info.WriteQuotaAvailable || pThis->cbBounceBufAlloc)
+                            )
+                    {
+                        cbToWrite = Info.WriteQuotaAvailable;
+                        if (!cbToWrite)
+                            rc = VINF_TRY_AGAIN;
+                    }
+#endif
+                }
+                pThis->fPromisedWritable = false;
+
+                /* Do the bounce buffering. */
+                if (    pThis->cbBounceBufAlloc < cbToWrite
+                    &&  pThis->cbBounceBufAlloc < RTPIPE_NT_SIZE)
+                {
+                    if (cbToWrite > RTPIPE_NT_SIZE)
+                        cbToWrite = RTPIPE_NT_SIZE;
+                    void *pv = RTMemRealloc(pThis->pbBounceBuf, RT_ALIGN_Z(cbToWrite, _1K));
+                    if (pv)
+                    {
+                        pThis->pbBounceBuf = (uint8_t *)pv;
+                        pThis->cbBounceBufAlloc = RT_ALIGN_Z(cbToWrite, _1K);
+                    }
+                    else
+                        rc = VERR_NO_MEMORY;
+                }
+                else if (cbToWrite > RTPIPE_NT_SIZE)
+                    cbToWrite = RTPIPE_NT_SIZE;
+                if (RT_SUCCESS(rc) && cbToWrite)
+                {
+                    memcpy(pThis->pbBounceBuf, pvBuf, cbToWrite);
+                    pThis->cbBounceBufUsed = (uint32_t)cbToWrite;
+
+                    /* Submit the write. */
+                    rc = ResetEvent(pThis->Overlapped.hEvent); Assert(rc == TRUE);
+                    DWORD cbWritten = 0;
+                    if (WriteFile(pThis->hPipe, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed,
+                                  &cbWritten, &pThis->Overlapped))
+                    {
+                        *pcbWritten = RT_MIN(cbWritten, cbToWrite); /* paranoia^3 */
+                        rc = VINF_SUCCESS;
+                    }
+                    else if (GetLastError() == ERROR_IO_PENDING)
+                    {
+                        *pcbWritten = cbToWrite;
+                        pThis->fIOPending = true;
+                        rc = VINF_SUCCESS;
+                    }
+                    else if (GetLastError() == ERROR_NO_DATA)
+                        rc = VERR_BROKEN_PIPE;
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+                }
+                else if (RT_SUCCESS(rc))
+                    *pcbWritten = 0;
+            }
+            else if (RT_SUCCESS(rc))
+                *pcbWritten = 0;
+
+            if (rc == VERR_BROKEN_PIPE)
+                pThis->fBrokenPipe = true;
+
+            pThis->cUsers--;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        RTCritSectLeave(&pThis->CritSect);
+    }
+    return rc;
+}
+
+
+RTDECL(int) RTPipeWriteBlocking(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
+    AssertPtr(pvBuf);
+    AssertPtrNull(pcbWritten);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        /* No concurrent writers, sorry. */
+        if (pThis->cUsers == 0)
+        {
+            pThis->cUsers++;
+
+            /*
+             * If I/O is pending, wait for it to complete.
+             */
+            if (pThis->fIOPending)
+            {
+                rc = rtPipeWriteCheckCompletion(pThis);
+                while (rc == VINF_TRY_AGAIN)
+                {
+                    Assert(pThis->fIOPending);
+                    HANDLE hEvent = pThis->Overlapped.hEvent;
+                    RTCritSectLeave(&pThis->CritSect);
+                    WaitForSingleObject(hEvent, INFINITE);
+                    RTCritSectEnter(&pThis->CritSect);
+                }
+            }
+            if (RT_SUCCESS(rc))
+            {
+                Assert(!pThis->fIOPending);
+                pThis->fPromisedWritable = false;
+
+                /*
+                 * Try write everything.
+                 * No bounce buffering, cUsers protects us.
+                 */
+                size_t cbTotalWritten = 0;
+                while (cbToWrite > 0)
+                {
+                    rc = ResetEvent(pThis->Overlapped.hEvent); Assert(rc == TRUE);
+                    pThis->fIOPending = true;
+                    RTCritSectLeave(&pThis->CritSect);
+
+                    DWORD cbWritten = 0;
+                    DWORD const cbToWriteInThisIteration = cbToWrite <= ~(DWORD)0 ? (DWORD)cbToWrite : ~(DWORD)0;
+                    if (WriteFile(pThis->hPipe, pvBuf, cbToWriteInThisIteration, &cbWritten, &pThis->Overlapped))
+                        rc = VINF_SUCCESS;
+                    else if (GetLastError() == ERROR_IO_PENDING)
+                    {
+                        WaitForSingleObject(pThis->Overlapped.hEvent, INFINITE);
+                        if (GetOverlappedResult(pThis->hPipe, &pThis->Overlapped, &cbWritten, TRUE /*fWait*/))
+                            rc = VINF_SUCCESS;
+                        else
+                            rc = RTErrConvertFromWin32(GetLastError());
+                    }
+                    else if (GetLastError() == ERROR_NO_DATA)
+                        rc = VERR_BROKEN_PIPE;
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+
+                    RTCritSectEnter(&pThis->CritSect);
+                    pThis->fIOPending = false;
+                    if (RT_FAILURE(rc))
+                        break;
+
+                    /* advance */
+                    if (cbWritten > cbToWriteInThisIteration) /* paranoia^3 */
+                        cbWritten = cbToWriteInThisIteration;
+                    pvBuf           = (char const *)pvBuf + cbWritten;
+                    cbTotalWritten += cbWritten;
+                    cbToWrite      -= cbWritten;
+                }
+
+                if (pcbWritten)
+                {
+                    *pcbWritten = cbTotalWritten;
+                    if (   RT_FAILURE(rc)
+                        && cbTotalWritten
+                        && rc != VERR_INVALID_POINTER)
+                        rc = VINF_SUCCESS;
+                }
+            }
+
+            if (rc == VERR_BROKEN_PIPE)
+                pThis->fBrokenPipe = true;
+
+            pThis->cUsers--;
+        }
+        else
+            rc = VERR_WRONG_ORDER;
+        RTCritSectLeave(&pThis->CritSect);
+    }
+    return rc;
+
+#if 0 /** @todo r=bird: What's this? */
+    int rc = rtPipeTryBlocking(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        size_t cbTotalWritten = 0;
+        while (cbToWrite > 0)
+        {
+            ssize_t cbWritten = write(pThis->fd, pvBuf, RT_MIN(cbToWrite, SSIZE_MAX));
+            if (cbWritten < 0)
+            {
+                rc = RTErrConvertFromErrno(errno);
+                break;
+            }
+
+            /* advance */
+            pvBuf           = (char const *)pvBuf + cbWritten;
+            cbTotalWritten += cbWritten;
+            cbToWrite      -= cbWritten;
+        }
+
+        if (pcbWritten)
+        {
+            *pcbWritten = cbTotalWritten;
+            if (   RT_FAILURE(rc)
+                && cbTotalWritten
+                && rc != VERR_INVALID_POINTER)
+                rc = VINF_SUCCESS;
+        }
+
+        ASMAtomicDecU32(&pThis->u32State);
+    }
+    return rc;
+#endif
+}
+
+
+RTDECL(int) RTPipeFlush(RTPIPE hPipe)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->fRead, VERR_ACCESS_DENIED);
+
+    if (!FlushFileBuffers(pThis->hPipe))
+    {
+        int rc = RTErrConvertFromWin32(GetLastError());
+        if (rc == VERR_BROKEN_PIPE)
+            pThis->fBrokenPipe = true;
+        return rc;
+    }
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTPipeSelectOne(RTPIPE hPipe, RTMSINTERVAL cMillies)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+
+    uint64_t const StartMsTS = RTTimeMilliTS();
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_FAILURE(rc))
+        return rc;
+    for (unsigned iLoop = 0;; iLoop++)
+    {
+        HANDLE  hWait = INVALID_HANDLE_VALUE;
+        if (pThis->fRead)
+        {
+            if (pThis->fIOPending)
+                hWait = pThis->Overlapped.hEvent;
+            else
+            {
+                /* Peek at the pipe buffer and see how many bytes it contains. */
+                DWORD cbAvailable;
+                if (   PeekNamedPipe(pThis->hPipe, NULL, 0, NULL, &cbAvailable, NULL)
+                    && cbAvailable > 0)
+                {
+                    rc = VINF_SUCCESS;
+                    break;
+                }
+
+                /* Start a zero byte read operation that we can wait on. */
+                if (cMillies == 0)
+                {
+                    rc = VERR_TIMEOUT;
+                    break;
+                }
+                AssertBreakStmt(pThis->cUsers == 0, rc = VERR_INTERNAL_ERROR_5);
+                rc = ResetEvent(pThis->Overlapped.hEvent); Assert(rc == TRUE);
+                DWORD cbRead = 0;
+                if (ReadFile(pThis->hPipe, pThis->abBuf, 0, &cbRead, &pThis->Overlapped))
+                {
+                    rc = VINF_SUCCESS;
+                    if (iLoop > 10)
+                        RTThreadYield();
+                }
+                else if (GetLastError() == ERROR_IO_PENDING)
+                {
+                    pThis->cUsers++;
+                    pThis->fIOPending = true;
+                    pThis->fZeroByteRead = true;
+                    hWait = pThis->Overlapped.hEvent;
+                }
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+        }
+        else
+        {
+            if (pThis->fIOPending)
+            {
+                rc = rtPipeWriteCheckCompletion(pThis);
+                if (RT_FAILURE(rc))
+                    break;
+            }
+            if (pThis->fIOPending)
+                hWait = pThis->Overlapped.hEvent;
+            else
+            {
+                FILE_PIPE_LOCAL_INFORMATION Info;
+                if (rtPipeQueryNtInfo(pThis, &Info))
+                {
+                    /* Check for broken pipe. */
+                    if (Info.NamedPipeState == FILE_PIPE_CLOSING_STATE)
+                    {
+                        rc = VERR_BROKEN_PIPE;
+                        break;
+                    }
+                    /* Check for available write buffer space. */
+                    else if (Info.WriteQuotaAvailable > 0)
+                    {
+                        pThis->fPromisedWritable = false;
+                        rc = VINF_SUCCESS;
+                        break;
+                    }
+                    /* delayed buffer alloc or timeout: phony promise
+                       later: See if we still can associate a semaphore with
+                              the pipe, like on OS/2. */
+                    else if (   Info.OutboundQuota == 0
+                             || cMillies)
+                    {
+                        pThis->fPromisedWritable = true;
+                        rc = VINF_SUCCESS;
+                        break;
+                    }
+                }
+                else
+                {
+                    pThis->fPromisedWritable = true;
+                    rc = VINF_SUCCESS;
+                    break;
+                }
+            }
+        }
+        if (RT_FAILURE(rc))
+            break;
+
+        /*
+         * Check for timeout.
+         */
+        DWORD cMsMaxWait = INFINITE;
+        if (   cMillies != RT_INDEFINITE_WAIT
+            && (   hWait != INVALID_HANDLE_VALUE
+                || iLoop > 10)
+           )
+        {
+            uint64_t cElapsed = RTTimeMilliTS() - StartMsTS;
+            if (cElapsed >= cMillies)
+            {
+                rc = VERR_TIMEOUT;
+                break;
+            }
+            cMsMaxWait = cMillies - (uint32_t)cElapsed;
+        }
+
+        /*
+         * Wait.
+         */
+        if (hWait != INVALID_HANDLE_VALUE)
+        {
+            RTCritSectLeave(&pThis->CritSect);
+
+            DWORD dwRc = WaitForSingleObject(hWait, cMsMaxWait);
+            if (dwRc == WAIT_OBJECT_0)
+                rc = VINF_SUCCESS;
+            else if (dwRc == WAIT_TIMEOUT)
+                rc = VERR_TIMEOUT;
+            else if (dwRc == WAIT_ABANDONED)
+                rc = VERR_INVALID_HANDLE;
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+            if (   RT_FAILURE(rc)
+                && pThis->u32Magic != RTPIPE_MAGIC)
+                return rc;
+
+            RTCritSectEnter(&pThis->CritSect);
+            if (pThis->fZeroByteRead)
+            {
+                pThis->cUsers--;
+                pThis->fIOPending = false;
+                if (rc != VINF_SUCCESS)
+                    CancelIo(pThis->hPipe);
+                DWORD cbRead = 0;
+                GetOverlappedResult(pThis->hPipe, &pThis->Overlapped, &cbRead, TRUE /*fWait*/);
+            }
+            if (RT_FAILURE(rc))
+                break;
+        }
+    }
+
+    if (rc == VERR_BROKEN_PIPE)
+        pThis->fBrokenPipe = true;
+
+    RTCritSectLeave(&pThis->CritSect);
+    return rc;
+}
+
+
+RTDECL(int) RTPipeQueryReadable(RTPIPE hPipe, size_t *pcbReadable)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->fRead, VERR_PIPE_NOT_READ);
+    AssertPtrReturn(pcbReadable, VERR_INVALID_POINTER);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    DWORD cbAvailable = 0;
+    if (PeekNamedPipe(pThis->hPipe, NULL, 0, NULL, &cbAvailable, NULL))
+        *pcbReadable = cbAvailable;
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    RTCritSectLeave(&pThis->CritSect);
+    return rc;
+}
+
+
+RTDECL(int) RTPipeQueryInfo(RTPIPE hPipe, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, 0);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, 0);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    AssertRCReturn(rc, 0);
+
+    rtPipeFakeQueryInfo(pObjInfo, enmAddAttr, pThis->fRead);
+
+    FILE_PIPE_LOCAL_INFORMATION Info;
+    if (rtPipeQueryNtInfo(pThis, &Info))
+    {
+        pObjInfo->cbAllocated = pThis->fRead ? Info.InboundQuota : Info.OutboundQuota;
+        pObjInfo->cbObject    = pThis->fRead ? Info.ReadDataAvailable : Info.WriteQuotaAvailable;
+    }
+
+    RTCritSectLeave(&pThis->CritSect);
+    return VINF_SUCCESS;
+}
+
+
+int rtPipePollGetHandle(RTPIPE hPipe, uint32_t fEvents, PRTHCINTPTR phNative)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, VERR_INVALID_HANDLE);
+
+    AssertReturn(!(fEvents & RTPOLL_EVT_READ)  || pThis->fRead,  VERR_INVALID_PARAMETER);
+    AssertReturn(!(fEvents & RTPOLL_EVT_WRITE) || !pThis->fRead, VERR_INVALID_PARAMETER);
+
+    /* Later: Try register an event handle with the pipe like on OS/2, there is
+       a file control for doing this obviously intended for the OS/2 subsys.
+       The question is whether this still exists on Vista and W7. */
+    *phNative = (RTHCINTPTR)pThis->Overlapped.hEvent;
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Checks for pending events.
+ *
+ * @returns Event mask or 0.
+ * @param   pThis               The pipe handle.
+ * @param   fEvents             The desired events.
+ */
+static uint32_t rtPipePollCheck(RTPIPEINTERNAL *pThis, uint32_t fEvents)
+{
+    uint32_t fRetEvents = 0;
+    if (pThis->fBrokenPipe)
+        fRetEvents |= RTPOLL_EVT_ERROR;
+    else if (pThis->fRead)
+    {
+        if (!pThis->fIOPending)
+        {
+            DWORD cbAvailable;
+            if (PeekNamedPipe(pThis->hPipe, NULL, 0, NULL, &cbAvailable, NULL))
+            {
+                if (   (fEvents & RTPOLL_EVT_READ)
+                    && cbAvailable > 0)
+                    fRetEvents |= RTPOLL_EVT_READ;
+            }
+            else
+            {
+                if (GetLastError() == ERROR_BROKEN_PIPE)
+                    pThis->fBrokenPipe = true;
+                fRetEvents |= RTPOLL_EVT_ERROR;
+            }
+        }
+    }
+    else
+    {
+        if (pThis->fIOPending)
+        {
+            rtPipeWriteCheckCompletion(pThis);
+            if (pThis->fBrokenPipe)
+                fRetEvents |= RTPOLL_EVT_ERROR;
+        }
+        if (   !pThis->fIOPending
+            && !fRetEvents)
+        {
+            FILE_PIPE_LOCAL_INFORMATION Info;
+            if (rtPipeQueryNtInfo(pThis, &Info))
+            {
+                /* Check for broken pipe. */
+                if (Info.NamedPipeState == FILE_PIPE_CLOSING_STATE)
+                {
+                    fRetEvents = RTPOLL_EVT_ERROR;
+                    pThis->fBrokenPipe = true;
+                }
+
+                /* Check if there is available buffer space. */
+                if (   !fRetEvents
+                    && (fEvents & RTPOLL_EVT_WRITE)
+                    && (   Info.WriteQuotaAvailable > 0
+                        || Info.OutboundQuota == 0)
+                    )
+                    fRetEvents |= RTPOLL_EVT_WRITE;
+            }
+            else if (fEvents & RTPOLL_EVT_WRITE)
+                fRetEvents |= RTPOLL_EVT_WRITE;
+        }
+    }
+
+    return fRetEvents;
+}
+
+
+/**
+ * Internal RTPoll helper that polls the pipe handle and, if @a fNoWait is
+ * clear, starts whatever actions we've got running during the poll call.
+ *
+ * @returns 0 if no pending events, actions initiated if @a fNoWait is clear.
+ *          Event mask (in @a fEvents) and no actions if the handle is ready
+ *          already.
+ *          UINT32_MAX (asserted) if the pipe handle is busy in I/O or a
+ *          different poll set.
+ *
+ * @param   hPipe               The pipe handle.
+ * @param   hPollSet            The poll set handle (for access checks).
+ * @param   fEvents             The events we're polling for.
+ * @param   fFinalEntry         Set if this is the final entry for this handle
+ *                              in this poll set.  This can be used for dealing
+ *                              with duplicate entries.
+ * @param   fNoWait             Set if it's a zero-wait poll call.  Clear if
+ *                              we'll wait for an event to occur.
+ */
+uint32_t rtPipePollStart(RTPIPE hPipe, RTPOLLSET hPollSet, uint32_t fEvents, bool fFinalEntry, bool fNoWait)
+{
+    /** @todo All this polling code could be optimized to make fewer system
+     *        calls; like for instance the ResetEvent calls. */
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, UINT32_MAX);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, UINT32_MAX);
+    RT_NOREF_PV(fFinalEntry);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    AssertRCReturn(rc, UINT32_MAX);
+
+    /* Check that this is the only current use of this pipe. */
+    uint32_t fRetEvents;
+    if (   pThis->cUsers   == 0
+        || pThis->hPollSet == hPollSet)
+    {
+        /* Check what the current events are. */
+        fRetEvents = rtPipePollCheck(pThis, fEvents);
+        if (   !fRetEvents
+            && !fNoWait)
+        {
+            /* Make sure the event semaphore has been reset. */
+            if (!pThis->fIOPending)
+            {
+                rc = ResetEvent(pThis->Overlapped.hEvent);
+                Assert(rc == TRUE);
+            }
+
+            /* Kick off the zero byte read thing if applicable. */
+            if (   !pThis->fIOPending
+                && pThis->fRead
+                && (fEvents & RTPOLL_EVT_READ)
+               )
+            {
+                DWORD cbRead = 0;
+                if (ReadFile(pThis->hPipe, pThis->abBuf, 0, &cbRead, &pThis->Overlapped))
+                    fRetEvents = rtPipePollCheck(pThis, fEvents);
+                else if (GetLastError() == ERROR_IO_PENDING)
+                {
+                    pThis->fIOPending    = true;
+                    pThis->fZeroByteRead = true;
+                }
+                else
+                    fRetEvents = RTPOLL_EVT_ERROR;
+            }
+
+            /* If we're still set for the waiting, record the poll set and
+               mark the pipe used. */
+            if (!fRetEvents)
+            {
+                pThis->cUsers++;
+                pThis->hPollSet = hPollSet;
+            }
+        }
+    }
+    else
+    {
+        AssertFailed();
+        fRetEvents = UINT32_MAX;
+    }
+
+    RTCritSectLeave(&pThis->CritSect);
+    return fRetEvents;
+}
+
+
+/**
+ * Called after a WaitForMultipleObjects returned in order to check for pending
+ * events and stop whatever actions that rtPipePollStart() initiated.
+ *
+ * @returns Event mask or 0.
+ *
+ * @param   hPipe               The pipe handle.
+ * @param   fEvents             The events we're polling for.
+ * @param   fFinalEntry         Set if this is the final entry for this handle
+ *                              in this poll set.  This can be used for dealing
+ *                              with duplicate entries.  Only keep in mind that
+ *                              this method is called in reverse order, so the
+ *                              first call will have this set (when the entire
+ *                              set was processed).
+ * @param   fHarvestEvents      Set if we should check for pending events.
+ */
+uint32_t rtPipePollDone(RTPIPE hPipe, uint32_t fEvents, bool fFinalEntry, bool fHarvestEvents)
+{
+    RTPIPEINTERNAL *pThis = hPipe;
+    AssertPtrReturn(pThis, 0);
+    AssertReturn(pThis->u32Magic == RTPIPE_MAGIC, 0);
+    RT_NOREF_PV(fFinalEntry);
+    RT_NOREF_PV(fHarvestEvents);
+
+    int rc = RTCritSectEnter(&pThis->CritSect);
+    AssertRCReturn(rc, 0);
+
+    Assert(pThis->cUsers > 0);
+
+
+    /* Cancel the zero byte read. */
+    uint32_t fRetEvents = 0;
+    if (pThis->fZeroByteRead)
+    {
+        CancelIo(pThis->hPipe);
+        DWORD cbRead = 0;
+        if (   !GetOverlappedResult(pThis->hPipe, &pThis->Overlapped, &cbRead, TRUE /*fWait*/)
+            && GetLastError() != ERROR_OPERATION_ABORTED)
+            fRetEvents = RTPOLL_EVT_ERROR;
+
+        pThis->fIOPending    = false;
+        pThis->fZeroByteRead = false;
+    }
+
+    /* harvest events. */
+    fRetEvents |= rtPipePollCheck(pThis, fEvents);
+
+    /* update counters. */
+    pThis->cUsers--;
+    /** @todo This isn't sane, or is it? See OS/2 impl. */
+    if (!pThis->cUsers)
+        pThis->hPollSet = NIL_RTPOLLSET;
+
+    RTCritSectLeave(&pThis->CritSect);
+    return fRetEvents;
+}
+
diff --git a/src/VBox/Runtime/r3/win/process-win.cpp b/src/VBox/Runtime/r3/win/process-win.cpp
new file mode 100644
index 00000000..9796b428
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/process-win.cpp
@@ -0,0 +1,2740 @@
+/* $Id: process-win.cpp $ */
+/** @file
+ * IPRT - Process, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_PROCESS
+#include <iprt/asm.h> /* hack */
+
+#include <iprt/nt/nt-and-windows.h>
+#include <Userenv.h>
+#include <tlhelp32.h>
+#include <process.h>
+#include <errno.h>
+#include <Strsafe.h>
+#include <LsaLookup.h>
+#include <Lmcons.h>
+
+#define _NTDEF_ /* Prevents redefining (P)UNICODE_STRING. */
+#include <Ntsecapi.h>
+
+#include <iprt/process.h>
+#include "internal-r3-win.h"
+
+#include <iprt/assert.h>
+#include <iprt/critsect.h>
+#include <iprt/file.h>
+#include <iprt/err.h>
+#include <iprt/env.h>
+#include <iprt/getopt.h>
+#include <iprt/initterm.h>
+#include <iprt/ldr.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/once.h>
+#include <iprt/path.h>
+#include <iprt/pipe.h>
+#include <iprt/string.h>
+#include <iprt/socket.h>
+#include <iprt/utf16.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/* kernel32.dll: */
+//typedef DWORD   (WINAPI *PFNWTSGETACTIVECONSOLESESSIONID)(VOID);
+typedef HANDLE  (WINAPI *PFNCREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
+typedef BOOL    (WINAPI *PFNPROCESS32FIRST)(HANDLE, LPPROCESSENTRY32);
+typedef BOOL    (WINAPI *PFNPROCESS32FIRSTW)(HANDLE, LPPROCESSENTRY32W);
+typedef BOOL    (WINAPI *PFNPROCESS32NEXT)(HANDLE, LPPROCESSENTRY32);
+typedef BOOL    (WINAPI *PFNPROCESS32NEXTW)(HANDLE, LPPROCESSENTRY32W);
+
+/* psapi.dll: */
+typedef BOOL    (WINAPI *PFNENUMPROCESSES)(LPDWORD, DWORD, LPDWORD);
+typedef DWORD   (WINAPI *PFNGETMODULEBASENAME)(HANDLE, HMODULE, LPTSTR, DWORD);
+
+/* advapi32.dll: */
+typedef BOOL    (WINAPI *PFNCREATEPROCESSWITHLOGON)(LPCWSTR, LPCWSTR, LPCWSTR, DWORD, LPCWSTR, LPWSTR, DWORD,
+                                                    LPVOID, LPCWSTR, LPSTARTUPINFOW, LPPROCESS_INFORMATION);
+typedef NTSTATUS (NTAPI *PFNLSALOOKUPNAMES2)(LSA_HANDLE, ULONG, ULONG, PLSA_UNICODE_STRING,
+                                             PLSA_REFERENCED_DOMAIN_LIST*, PLSA_TRANSLATED_SID2*);
+
+/* userenv.dll: */
+typedef BOOL    (WINAPI *PFNCREATEENVIRONMENTBLOCK)(LPVOID *, HANDLE, BOOL);
+typedef BOOL    (WINAPI *PFNPFNDESTROYENVIRONMENTBLOCK)(LPVOID);
+typedef BOOL    (WINAPI *PFNLOADUSERPROFILEW)(HANDLE, LPPROFILEINFOW);
+typedef BOOL    (WINAPI *PFNUNLOADUSERPROFILE)(HANDLE, HANDLE);
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Init once structure. */
+static RTONCE       g_rtProcWinInitOnce = RTONCE_INITIALIZER;
+/** Critical section protecting the process array. */
+static RTCRITSECT   g_CritSect;
+/** The number of processes in the array. */
+static uint32_t     g_cProcesses;
+/** The current allocation size. */
+static uint32_t     g_cProcessesAlloc;
+/** Array containing the live or non-reaped child processes. */
+static struct RTPROCWINENTRY
+{
+    /** The process ID. */
+    ULONG_PTR       pid;
+    /** The process handle. */
+    HANDLE          hProcess;
+}                  *g_paProcesses;
+
+/** Structure for storing a user's account info.
+ *  Must be free'd with rtProcWinFreeAccountInfo(). */
+typedef struct RTPROCWINACCOUNTINFO
+{
+    /** User name. */
+    PRTUTF16        pwszUserName;
+    /** Domain this account is tied to. Can be NULL if no domain is being used. */
+    PRTUTF16        pwszDomain;
+} RTPROCWINACCOUNTINFO, *PRTPROCWINACCOUNTINFO;
+
+/** @name userenv.dll imports (we don't unload it).
+ * They're all optional. So in addition to using g_rtProcWinResolveOnce, the
+ * caller must also check if any of the necessary APIs are NULL pointers.
+ * @{ */
+/** Init once structure for run-as-user functions we need. */
+static RTONCE                           g_rtProcWinResolveOnce          = RTONCE_INITIALIZER;
+/* kernel32.dll: */
+static PFNCREATETOOLHELP32SNAPSHOT      g_pfnCreateToolhelp32Snapshot   = NULL;
+static PFNPROCESS32FIRST                g_pfnProcess32First             = NULL;
+static PFNPROCESS32NEXT                 g_pfnProcess32Next              = NULL;
+static PFNPROCESS32FIRSTW               g_pfnProcess32FirstW            = NULL;
+static PFNPROCESS32NEXTW                g_pfnProcess32NextW             = NULL;
+/* psapi.dll: */
+static PFNGETMODULEBASENAME             g_pfnGetModuleBaseName          = NULL;
+static PFNENUMPROCESSES                 g_pfnEnumProcesses              = NULL;
+/* advapi32.dll: */
+static PFNCREATEPROCESSWITHLOGON        g_pfnCreateProcessWithLogonW    = NULL;
+static decltype(LogonUserW)            *g_pfnLogonUserW                 = NULL;
+static decltype(CreateProcessAsUserW)  *g_pfnCreateProcessAsUserW       = NULL;
+/* user32.dll: */
+static decltype(OpenWindowStationW)    *g_pfnOpenWindowStationW         = NULL;
+static decltype(CloseWindowStation)    *g_pfnCloseWindowStation        = NULL;
+/* userenv.dll: */
+static PFNCREATEENVIRONMENTBLOCK        g_pfnCreateEnvironmentBlock     = NULL;
+static PFNPFNDESTROYENVIRONMENTBLOCK    g_pfnDestroyEnvironmentBlock    = NULL;
+static PFNLOADUSERPROFILEW              g_pfnLoadUserProfileW           = NULL;
+static PFNUNLOADUSERPROFILE             g_pfnUnloadUserProfile          = NULL;
+/** @} */
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int rtProcWinFindExe(uint32_t fFlags, RTENV hEnv, const char *pszExec, PRTUTF16 *ppwszExec);
+static int rtProcWinCreateEnvBlockAndFindExe(uint32_t fFlags, RTENV hEnv, const char *pszExec,
+                                             PRTUTF16 *ppwszzBlock, PRTUTF16 *ppwszExec);
+
+
+/**
+ * Clean up the globals.
+ *
+ * @param   enmReason           Ignored.
+ * @param   iStatus             Ignored.
+ * @param   pvUser              Ignored.
+ */
+static DECLCALLBACK(void) rtProcWinTerm(RTTERMREASON enmReason, int32_t iStatus, void *pvUser)
+{
+    NOREF(pvUser); NOREF(iStatus); NOREF(enmReason);
+
+    RTCritSectDelete(&g_CritSect);
+
+    size_t i = g_cProcesses;
+    while (i-- > 0)
+    {
+        CloseHandle(g_paProcesses[i].hProcess);
+        g_paProcesses[i].hProcess = NULL;
+    }
+    RTMemFree(g_paProcesses);
+
+    g_paProcesses     = NULL;
+    g_cProcesses      = 0;
+    g_cProcessesAlloc = 0;
+}
+
+
+/**
+ * Initialize the globals.
+ *
+ * @returns IPRT status code.
+ * @param   pvUser              Ignored.
+ */
+static DECLCALLBACK(int32_t) rtProcWinInitOnce(void *pvUser)
+{
+    NOREF(pvUser);
+
+    g_cProcesses        = 0;
+    g_cProcessesAlloc   = 0;
+    g_paProcesses       = NULL;
+    int rc = RTCritSectInit(&g_CritSect);
+    if (RT_SUCCESS(rc))
+    {
+        /** @todo init once, terminate once - this is a generic thing which should
+         *        have some kind of static and simpler setup!  */
+        rc = RTTermRegisterCallback(rtProcWinTerm, NULL);
+        if (RT_SUCCESS(rc))
+            return rc;
+        RTCritSectDelete(&g_CritSect);
+    }
+    return rc;
+}
+
+
+/**
+ * Gets the process handle for a process from g_paProcesses.
+ *
+ * @returns Process handle if found, NULL if not.
+ * @param   pid                 The process to remove (pid).
+ */
+static HANDLE rtProcWinFindPid(RTPROCESS pid)
+{
+    HANDLE hProcess = NULL;
+
+    RTCritSectEnter(&g_CritSect);
+    uint32_t i = g_cProcesses;
+    while (i-- > 0)
+        if (g_paProcesses[i].pid == pid)
+        {
+            hProcess = g_paProcesses[i].hProcess;
+            break;
+        }
+    RTCritSectLeave(&g_CritSect);
+
+    return hProcess;
+}
+
+
+/**
+ * Removes a process from g_paProcesses and closes the process handle.
+ *
+ * @param   pid                 The process to remove (pid).
+ */
+static void rtProcWinRemovePid(RTPROCESS pid)
+{
+    RTCritSectEnter(&g_CritSect);
+    uint32_t i = g_cProcesses;
+    while (i-- > 0)
+        if (g_paProcesses[i].pid == pid)
+        {
+            HANDLE hProcess = g_paProcesses[i].hProcess;
+
+            g_cProcesses--;
+            uint32_t cToMove = g_cProcesses - i;
+            if (cToMove)
+                memmove(&g_paProcesses[i], &g_paProcesses[i + 1], cToMove * sizeof(g_paProcesses[0]));
+
+            RTCritSectLeave(&g_CritSect);
+            CloseHandle(hProcess);
+            return;
+        }
+    RTCritSectLeave(&g_CritSect);
+}
+
+
+/**
+ * Adds a process to g_paProcesses.
+ *
+ * @returns IPRT status code.
+ * @param   pid                 The process id.
+ * @param   hProcess            The process handle.
+ */
+static int rtProcWinAddPid(RTPROCESS pid, HANDLE hProcess)
+{
+    RTCritSectEnter(&g_CritSect);
+
+    uint32_t i = g_cProcesses;
+    if (i >= g_cProcessesAlloc)
+    {
+        void *pvNew = RTMemRealloc(g_paProcesses, (i + 16) * sizeof(g_paProcesses[0]));
+        if (RT_UNLIKELY(!pvNew))
+        {
+            RTCritSectLeave(&g_CritSect);
+            return VERR_NO_MEMORY;
+        }
+        g_paProcesses     = (struct RTPROCWINENTRY *)pvNew;
+        g_cProcessesAlloc = i + 16;
+    }
+
+    g_paProcesses[i].pid      = pid;
+    g_paProcesses[i].hProcess = hProcess;
+    g_cProcesses = i + 1;
+
+    RTCritSectLeave(&g_CritSect);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Initialize the import APIs for run-as-user and special environment support.
+ *
+ * @returns IPRT status code.
+ * @param   pvUser              Ignored.
+ */
+static DECLCALLBACK(int) rtProcWinResolveOnce(void *pvUser)
+{
+    int      rc;
+    RTLDRMOD hMod;
+    RT_NOREF_PV(pvUser);
+
+    /*
+     * kernel32.dll APIs introduced after NT4.
+     */
+    g_pfnCreateToolhelp32Snapshot   = (PFNCREATETOOLHELP32SNAPSHOT)GetProcAddress(g_hModKernel32, "CreateToolhelp32Snapshot");
+    g_pfnProcess32First             = (PFNPROCESS32FIRST          )GetProcAddress(g_hModKernel32, "Process32First");
+    g_pfnProcess32FirstW            = (PFNPROCESS32FIRSTW         )GetProcAddress(g_hModKernel32, "Process32FirstW");
+    g_pfnProcess32Next              = (PFNPROCESS32NEXT           )GetProcAddress(g_hModKernel32, "Process32Next");
+    g_pfnProcess32NextW             = (PFNPROCESS32NEXTW          )GetProcAddress(g_hModKernel32, "Process32NextW");
+
+    /*
+     * psapi.dll APIs, if none of the above are available.
+     */
+    if (   !g_pfnCreateToolhelp32Snapshot
+        || !g_pfnProcess32First
+        || !g_pfnProcess32Next)
+    {
+        Assert(!g_pfnCreateToolhelp32Snapshot && !g_pfnProcess32First && !g_pfnProcess32Next);
+
+        rc = RTLdrLoadSystem("psapi.dll", true /*fNoUnload*/, &hMod);
+        if (RT_SUCCESS(rc))
+        {
+            rc = RTLdrGetSymbol(hMod, "GetModuleBaseName", (void **)&g_pfnGetModuleBaseName);
+            AssertStmt(RT_SUCCESS(rc), g_pfnGetModuleBaseName = NULL);
+
+            rc = RTLdrGetSymbol(hMod, "EnumProcesses", (void **)&g_pfnEnumProcesses);
+            AssertStmt(RT_SUCCESS(rc), g_pfnEnumProcesses = NULL);
+
+            RTLdrClose(hMod);
+        }
+    }
+
+    /*
+     * advapi32.dll APIs.
+     */
+    rc = RTLdrLoadSystem("advapi32.dll", true /*fNoUnload*/, &hMod);
+    if (RT_SUCCESS(rc))
+    {
+        rc = RTLdrGetSymbol(hMod, "CreateProcessWithLogonW", (void **)&g_pfnCreateProcessWithLogonW);
+        if (RT_FAILURE(rc)) { g_pfnCreateProcessWithLogonW = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT4); }
+
+        rc = RTLdrGetSymbol(hMod, "LogonUserW", (void **)&g_pfnLogonUserW);
+        if (RT_FAILURE(rc)) { g_pfnLogonUserW = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT350); }
+
+        rc = RTLdrGetSymbol(hMod, "CreateProcessAsUserW", (void **)&g_pfnCreateProcessAsUserW);
+        if (RT_FAILURE(rc)) { g_pfnCreateProcessAsUserW = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT350); }
+
+        RTLdrClose(hMod);
+    }
+
+    /*
+     * user32.dll APIs.
+     */
+    rc = RTLdrLoadSystem("user32.dll", true /*fNoUnload*/, &hMod);
+    if (RT_SUCCESS(rc))
+    {
+        rc = RTLdrGetSymbol(hMod, "OpenWindowStationW", (void **)&g_pfnOpenWindowStationW);
+        if (RT_FAILURE(rc)) { g_pfnOpenWindowStationW = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT310); }
+
+        rc = RTLdrGetSymbol(hMod, "CloseWindowStation", (void **)&g_pfnCloseWindowStation);
+        if (RT_FAILURE(rc)) { g_pfnCloseWindowStation = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT310); }
+
+        RTLdrClose(hMod);
+    }
+
+    /*
+     * userenv.dll APIs.
+     */
+    rc = RTLdrLoadSystem("userenv.dll", true /*fNoUnload*/, &hMod);
+    if (RT_SUCCESS(rc))
+    {
+        rc = RTLdrGetSymbol(hMod, "LoadUserProfileW", (void **)&g_pfnLoadUserProfileW);
+        if (RT_FAILURE(rc)) { g_pfnLoadUserProfileW = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT4); }
+
+        rc = RTLdrGetSymbol(hMod, "UnloadUserProfile", (void **)&g_pfnUnloadUserProfile);
+        if (RT_FAILURE(rc)) { g_pfnUnloadUserProfile = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT4); }
+
+        rc = RTLdrGetSymbol(hMod, "CreateEnvironmentBlock", (void **)&g_pfnCreateEnvironmentBlock);
+        if (RT_FAILURE(rc)) { g_pfnCreateEnvironmentBlock = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT4); }
+
+        rc = RTLdrGetSymbol(hMod, "DestroyEnvironmentBlock", (void **)&g_pfnDestroyEnvironmentBlock);
+        if (RT_FAILURE(rc)) { g_pfnDestroyEnvironmentBlock = NULL; Assert(g_enmWinVer <= kRTWinOSType_NT4); }
+
+        RTLdrClose(hMod);
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+RTR3DECL(int) RTProcCreate(const char *pszExec, const char * const *papszArgs, RTENV Env, unsigned fFlags, PRTPROCESS pProcess)
+{
+    return RTProcCreateEx(pszExec, papszArgs, Env, fFlags,
+                          NULL, NULL, NULL,  /* standard handles */
+                          NULL /*pszAsUser*/, NULL /* pszPassword*/,
+                          NULL /*pvExtraData*/, pProcess);
+}
+
+
+/**
+ * The following NT call is for v3.51 and does the equivalent of:
+ *      DuplicateTokenEx(hSrcToken, MAXIMUM_ALLOWED, NULL,
+ *                       SecurityIdentification, TokenPrimary, phToken);
+ */
+static int rtProcWinDuplicateToken(HANDLE hSrcToken, PHANDLE phToken)
+{
+    int rc;
+    if (g_pfnNtDuplicateToken)
+    {
+        SECURITY_QUALITY_OF_SERVICE SecQoS;
+        SecQoS.Length              = sizeof(SecQoS);
+        SecQoS.ImpersonationLevel  = SecurityIdentification;
+        SecQoS.ContextTrackingMode = SECURITY_DYNAMIC_TRACKING;
+        SecQoS.EffectiveOnly       = FALSE;
+
+        OBJECT_ATTRIBUTES ObjAttr;
+        InitializeObjectAttributes(&ObjAttr, NULL /*Name*/, 0 /*OBJ_XXX*/, NULL /*Root*/, NULL /*SecDesc*/);
+        ObjAttr.SecurityQualityOfService = &SecQoS;
+
+        NTSTATUS rcNt = g_pfnNtDuplicateToken(hSrcToken, MAXIMUM_ALLOWED, &ObjAttr, FALSE, TokenPrimary, phToken);
+        if (NT_SUCCESS(rcNt))
+            rc = VINF_SUCCESS;
+        else
+            rc = RTErrConvertFromNtStatus(rcNt);
+    }
+    else
+        rc = VERR_SYMBOL_NOT_FOUND; /** @todo do we really need to duplicate the token? */
+    return rc;
+}
+
+
+/**
+ * Get the token assigned to the thread indicated by @a hThread.
+ *
+ * Only used when RTPROC_FLAGS_AS_IMPERSONATED_TOKEN is in effect and the
+ * purpose is to get a duplicate the impersonated token of the current thread.
+ *
+ * @returns IPRT status code.
+ * @param   hThread         The thread handle (current thread).
+ * @param   phToken         Where to return the a duplicate of the thread token
+ *                          handle on success. (The caller closes it.)
+ */
+static int rtProcWinGetThreadTokenHandle(HANDLE hThread, PHANDLE phToken)
+{
+    AssertPtr(phToken);
+
+    int     rc;
+    HANDLE hTokenThread;
+    if (OpenThreadToken(hThread,
+                        TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY | TOKEN_DUPLICATE
+                        | TOKEN_ASSIGN_PRIMARY | TOKEN_ADJUST_SESSIONID | TOKEN_READ | TOKEN_WRITE,
+                        TRUE /* OpenAsSelf - for impersonation at SecurityIdentification level */,
+                        &hTokenThread))
+    {
+        rc = rtProcWinDuplicateToken(hTokenThread, phToken);
+        CloseHandle(hTokenThread);
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+    return rc;
+}
+
+
+/**
+ * Get the token assigned the process indicated by @a hProcess.
+ *
+ * Only used when pwszUser is NULL and RTPROC_FLAGS_AS_IMPERSONATED_TOKEN isn't
+ * set.
+ *
+ * @returns IPRT status code.
+ * @param   hProcess        The process handle (current process).
+ * @param   phToken         Where to return the a duplicate of the thread token
+ *                          handle on success. (The caller closes it.)
+ */
+static int rtProcWinGetProcessTokenHandle(HANDLE hProcess, PHANDLE phToken)
+{
+    AssertPtr(phToken);
+
+    int     rc;
+    HANDLE hTokenProcess;
+    if (OpenProcessToken(hProcess,
+                         TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY | TOKEN_DUPLICATE
+                         | TOKEN_ASSIGN_PRIMARY | TOKEN_ADJUST_SESSIONID | TOKEN_READ | TOKEN_WRITE,
+                         &hTokenProcess))
+    {
+        rc = rtProcWinDuplicateToken(hTokenProcess, phToken); /* not sure if this is strictly necessary */
+        CloseHandle(hTokenProcess);
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+    return rc;
+}
+
+
+/**
+ * Get the process token of the process indicated by @a dwPID if the @a pSid and
+ * @a idSessionDesired matches.
+ *
+ * @returns IPRT status code.
+ * @param   dwPid               The process identifier.
+ * @param   pSid                The secure identifier of the user.
+ * @param   idDesiredSession    The session the process candidate should
+ *                              preferably belong to, UINT32_MAX if anything
+ *                              goes.
+ * @param   phToken             Where to return the a duplicate of the process token
+ *                              handle on success. (The caller closes it.)
+ */
+static int rtProcWinGetProcessTokenHandle(DWORD dwPid, PSID pSid, DWORD idDesiredSession, PHANDLE phToken)
+{
+    AssertPtr(pSid);
+    AssertPtr(phToken);
+
+    int     rc;
+    HANDLE  hProc = OpenProcess(MAXIMUM_ALLOWED, TRUE, dwPid);
+    if (hProc != NULL)
+    {
+        HANDLE hTokenProc;
+        if (OpenProcessToken(hProc,
+                             TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY | TOKEN_DUPLICATE | TOKEN_IMPERSONATE
+                             | TOKEN_ASSIGN_PRIMARY | TOKEN_ADJUST_SESSIONID | TOKEN_READ | TOKEN_WRITE,
+                             &hTokenProc))
+        {
+            /*
+             * Query the user SID from the token.
+             */
+            SetLastError(NO_ERROR);
+            DWORD   dwSize = 0;
+            BOOL    fRc    = GetTokenInformation(hTokenProc, TokenUser, NULL, 0, &dwSize);
+            DWORD   dwErr  = GetLastError();
+            if (   !fRc
+                && dwErr == ERROR_INSUFFICIENT_BUFFER
+                && dwSize > 0)
+            {
+                PTOKEN_USER pTokenUser = (PTOKEN_USER)RTMemTmpAllocZ(dwSize);
+                if (pTokenUser)
+                {
+                    if (GetTokenInformation(hTokenProc, TokenUser, pTokenUser, dwSize, &dwSize))
+                    {
+                        /*
+                         * Match token user with the user we're want to create a process as.
+                         */
+                        if (   IsValidSid(pTokenUser->User.Sid)
+                            && EqualSid(pTokenUser->User.Sid, pSid))
+                        {
+                            /*
+                             * Do we need to match the session ID?
+                             */
+                            rc = VINF_SUCCESS;
+                            if (idDesiredSession != UINT32_MAX)
+                            {
+                                DWORD idCurSession = UINT32_MAX;
+                                if (GetTokenInformation(hTokenProc, TokenSessionId, &idCurSession, sizeof(DWORD), &dwSize))
+                                    rc = idDesiredSession == idCurSession ? VINF_SUCCESS : VERR_NOT_FOUND;
+                                else
+                                    rc = RTErrConvertFromWin32(GetLastError());
+                            }
+                            if (RT_SUCCESS(rc))
+                            {
+                                /*
+                                 * Got a match.  Duplicate the token.  This duplicated token will
+                                 * be used for the actual CreateProcessAsUserW() call then.
+                                 */
+                                rc = rtProcWinDuplicateToken(hTokenProc, phToken);
+                            }
+                        }
+                        else
+                            rc = VERR_NOT_FOUND;
+                    }
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+                    RTMemTmpFree(pTokenUser);
+                }
+                else
+                    rc = VERR_NO_MEMORY;
+            }
+            else if (fRc || dwErr == NO_ERROR)
+                rc = VERR_IPE_UNEXPECTED_STATUS;
+            else
+                rc = RTErrConvertFromWin32(dwErr);
+            CloseHandle(hTokenProc);
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+        CloseHandle(hProc);
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+    return rc;
+}
+
+
+/**
+ * Fallback method for rtProcWinFindTokenByProcess that uses the older NT4
+ * PSAPI.DLL API.
+ *
+ * @returns Success indicator.
+ * @param   papszNames      The process candidates, in prioritized order.
+ * @param   pSid            The secure identifier of the user.
+ * @param   phToken         Where to return the token handle - duplicate,
+ *                          caller closes it on success.
+ *
+ * @remarks NT4 needs a copy of "PSAPI.dll" (redistributed by Microsoft and not
+ *          part of the OS) in order to get a lookup.  If we don't have this DLL
+ *          we are not able to get a token and therefore no UI will be visible.
+ */
+static bool rtProcWinFindTokenByProcessAndPsApi(const char * const *papszNames, PSID pSid, PHANDLE phToken)
+{
+    /*
+     * Load PSAPI.DLL and resolve the two symbols we need.
+     */
+    if (   !g_pfnGetModuleBaseName
+        || !g_pfnEnumProcesses)
+        return false;
+
+    /*
+     * Get a list of PID.  We retry if it looks like there are more PIDs
+     * to be returned than what we supplied buffer space for.
+     */
+    bool   fFound          = false;
+    int    rc              = VINF_SUCCESS;
+    DWORD  cbPidsAllocated = 4096;
+    DWORD  cbPidsReturned  = 0; /* (MSC maybe used uninitialized) */
+    DWORD *paPids;
+    for (;;)
+    {
+        paPids = (DWORD *)RTMemTmpAlloc(cbPidsAllocated);
+        AssertBreakStmt(paPids, rc = VERR_NO_TMP_MEMORY);
+        cbPidsReturned = 0;
+        if (!g_pfnEnumProcesses(paPids, cbPidsAllocated, &cbPidsReturned))
+        {
+            rc = RTErrConvertFromWin32(GetLastError());
+            AssertMsgFailedBreak(("%Rrc\n", rc));
+        }
+        if (   cbPidsReturned < cbPidsAllocated
+            || cbPidsAllocated >= _512K)
+            break;
+        RTMemTmpFree(paPids);
+        cbPidsAllocated *= 2;
+    }
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Search for the process.
+         *
+         * We ASSUME that the caller won't be specifying any names longer
+         * than RTPATH_MAX.
+         */
+        DWORD cbProcName  = RTPATH_MAX;
+        char *pszProcName = (char *)RTMemTmpAlloc(RTPATH_MAX);
+        if (pszProcName)
+        {
+            for (size_t i = 0; papszNames[i] && !fFound; i++)
+            {
+                const DWORD cPids = cbPidsReturned / sizeof(DWORD);
+                for (DWORD iPid = 0; iPid < cPids && !fFound; iPid++)
+                {
+                    HANDLE hProc = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, paPids[iPid]);
+                    if (hProc)
+                    {
+                        *pszProcName = '\0';
+                        DWORD cbRet = g_pfnGetModuleBaseName(hProc, 0 /*hModule = exe */, pszProcName, cbProcName);
+                        if (   cbRet > 0
+                            && _stricmp(pszProcName, papszNames[i]) == 0
+                            && RT_SUCCESS(rtProcWinGetProcessTokenHandle(paPids[iPid], pSid, UINT32_MAX, phToken)))
+                            fFound = true;
+                        CloseHandle(hProc);
+                    }
+                }
+            }
+            RTMemTmpFree(pszProcName);
+        }
+        else
+            rc = VERR_NO_TMP_MEMORY;
+    }
+    RTMemTmpFree(paPids);
+
+    return fFound;
+}
+
+
+/**
+ * Finds a one of the processes in @a papszNames running with user @a pSid and possibly
+ * in the required windows session. Returns a duplicate handle to its token.
+ *
+ * @returns Success indicator.
+ * @param   papszNames          The process candidates, in prioritized order.
+ * @param   pSid                The secure identifier of the user.
+ * @param   idDesiredSession    The session the process candidate should
+ *                              belong to if possible, UINT32_MAX if anything
+ *                              goes.
+ * @param   phToken             Where to return the token handle - duplicate,
+ *                              caller closes it on success.
+ */
+static bool rtProcWinFindTokenByProcess(const char * const *papszNames, PSID pSid, uint32_t idDesiredSession, PHANDLE phToken)
+{
+    AssertPtr(papszNames);
+    AssertPtr(pSid);
+    AssertPtr(phToken);
+
+    bool fFound = false;
+
+    /*
+     * On modern systems (W2K+) try the Toolhelp32 API first; this is more stable
+     * and reliable.  Fallback to EnumProcess on NT4.
+     */
+    bool fFallback = true;
+    if (g_pfnProcess32Next && g_pfnProcess32First && g_pfnCreateToolhelp32Snapshot)
+    {
+        HANDLE hSnap = g_pfnCreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+        Assert(hSnap != INVALID_HANDLE_VALUE);
+        if (hSnap != INVALID_HANDLE_VALUE)
+        {
+            fFallback = false;
+            for (size_t i = 0; papszNames[i] && !fFound; i++)
+            {
+                PROCESSENTRY32 ProcEntry;
+                ProcEntry.dwSize = sizeof(PROCESSENTRY32);
+/** @todo use W APIs here.   */
+                if (g_pfnProcess32First(hSnap, &ProcEntry))
+                {
+                    do
+                    {
+                        if (_stricmp(ProcEntry.szExeFile, papszNames[i]) == 0)
+                        {
+                            int rc = rtProcWinGetProcessTokenHandle(ProcEntry.th32ProcessID, pSid, idDesiredSession, phToken);
+                            if (RT_SUCCESS(rc))
+                            {
+                                fFound = true;
+                                break;
+                            }
+                        }
+                    } while (g_pfnProcess32Next(hSnap, &ProcEntry));
+                }
+#ifdef RT_STRICT
+                else
+                {
+                    DWORD dwErr = GetLastError();
+                    AssertMsgFailed(("dwErr=%u (%x)\n", dwErr, dwErr));
+                }
+#endif
+            }
+            CloseHandle(hSnap);
+        }
+    }
+
+    /* If we couldn't take a process snapshot for some reason or another, fall
+       back on the NT4 compatible API. */
+    if (fFallback)
+        fFound = rtProcWinFindTokenByProcessAndPsApi(papszNames, pSid, phToken);
+    return fFound;
+}
+
+
+/**
+ * Logs on a specified user and returns its primary token.
+ *
+ * @returns IPRT status code.
+ * @param   pwszUser            User name. A domain name can be specified (as part of a UPN, User Principal Name),
+ *                              e.g. "joedoe@example.com".
+ * @param   pwszPassword        Password.
+ * @param   phToken             Pointer to store the logon token.
+ */
+static int rtProcWinUserLogon(PRTUTF16 pwszUser, PRTUTF16 pwszPassword, HANDLE *phToken)
+{
+    AssertPtrReturn(pwszUser,     VERR_INVALID_POINTER);
+    AssertPtrReturn(pwszPassword, VERR_INVALID_POINTER);
+    AssertPtrReturn(phToken,      VERR_INVALID_POINTER);
+    if (!g_pfnLogonUserW)
+        return VERR_NOT_SUPPORTED;
+
+    /*
+     * Because we have to deal with http://support.microsoft.com/kb/245683
+     * for NULL domain names when running on NT4 here, pass an empty string if so.
+     * However, passing FQDNs should work!
+     *
+     * The SE_TCB_NAME (Policy: Act as part of the operating system) right
+     * is required on older windows versions (NT4, W2K, possibly XP).
+     */
+    PCRTUTF16 pwszDomainNone = g_enmWinVer < kRTWinOSType_2K ? L"" /* NT4 and older */ : NULL /* Windows 2000 and up */;
+    BOOL fRc = g_pfnLogonUserW(pwszUser,
+                               /* The domain always is passed as part of the UPN (user name). */
+                               pwszDomainNone,
+                               pwszPassword,
+                               LOGON32_LOGON_INTERACTIVE,
+                               LOGON32_PROVIDER_DEFAULT,
+                               phToken);
+    if (fRc)
+        return VINF_SUCCESS;
+
+    DWORD dwErr = GetLastError();
+    int rc = dwErr == ERROR_PRIVILEGE_NOT_HELD ? VERR_PROC_TCB_PRIV_NOT_HELD : RTErrConvertFromWin32(dwErr);
+    if (rc == VERR_UNRESOLVED_ERROR)
+        LogRelFunc(("dwErr=%u (%#x), rc=%Rrc\n", dwErr, dwErr, rc));
+    return rc;
+}
+
+
+/**
+ * Returns the environment to use for the child process.
+ *
+ * This implements the RTPROC_FLAGS_ENV_CHANGE_RECORD and environment related
+ * parts of RTPROC_FLAGS_PROFILE.
+ *
+ * @returns IPRT status code.
+ * @param   hToken      The user token to use if RTPROC_FLAGS_PROFILE is given.
+ *                      The caller must have loaded profile for this.
+ * @param   hEnv        The environment passed in by the RTProcCreateEx caller.
+ * @param   fFlags      The process creation flags passed in by the
+ *                      RTProcCreateEx caller (RTPROC_FLAGS_XXX).
+ * @param   phEnv       Where to return the environment to use.  This can either
+ *                      be a newly created environment block or @a hEnv.  In the
+ *                      former case, the caller must destroy it.
+ */
+static int rtProcWinCreateEnvFromToken(HANDLE hToken, RTENV hEnv, uint32_t fFlags, PRTENV phEnv)
+{
+    int rc;
+
+    /*
+     * Query the environment from the user profile associated with the token if
+     * the caller has specified it directly or indirectly.
+     */
+    if (   (fFlags & RTPROC_FLAGS_PROFILE)
+        && (   hEnv == RTENV_DEFAULT
+            || (fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD)) )
+    {
+        if (g_pfnCreateEnvironmentBlock && g_pfnDestroyEnvironmentBlock)
+        {
+            LPVOID pvEnvBlockProfile = NULL;
+            if (g_pfnCreateEnvironmentBlock(&pvEnvBlockProfile, hToken, FALSE /* Don't inherit from parent. */))
+            {
+                rc = RTEnvCloneUtf16Block(phEnv, (PCRTUTF16)pvEnvBlockProfile, 0 /*fFlags*/);
+                if (   (fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD)
+                    && RT_SUCCESS(rc)
+                    && hEnv != RTENV_DEFAULT)
+                {
+                    rc = RTEnvApplyChanges(*phEnv, hEnv);
+                    if (RT_FAILURE(rc))
+                        RTEnvDestroy(*phEnv);
+                }
+                g_pfnDestroyEnvironmentBlock(pvEnvBlockProfile);
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+        }
+        else
+            rc = VERR_SYMBOL_NOT_FOUND;
+    }
+    /*
+     * We we've got an incoming change record, combine it with the default environment.
+     */
+    else if (hEnv != RTENV_DEFAULT && (fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD))
+    {
+        rc = RTEnvClone(phEnv, RTENV_DEFAULT);
+        if (RT_SUCCESS(rc))
+        {
+            rc = RTEnvApplyChanges(*phEnv, hEnv);
+            if (RT_FAILURE(rc))
+                RTEnvDestroy(*phEnv);
+        }
+    }
+    /*
+     * Otherwise we can return the incoming environment directly.
+     */
+    else
+    {
+        *phEnv = hEnv;
+        rc = VINF_SUCCESS;
+    }
+
+    return rc;
+}
+
+
+/**
+ * Figures which privilege we're missing for success application of
+ * CreateProcessAsUserW.
+ *
+ * @returns IPRT error status.
+ */
+static int rtProcWinFigureWhichPrivilegeNotHeld2(void)
+{
+    HANDLE hToken;
+    if (OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken))
+    {
+        static struct
+        {
+            const char *pszName;
+            int         rc;
+        } const s_aPrivileges[] =
+        {
+            { SE_TCB_NAME,                      VERR_PROC_TCB_PRIV_NOT_HELD },
+            { SE_ASSIGNPRIMARYTOKEN_NAME,       VERR_PROC_APT_PRIV_NOT_HELD },
+            { SE_INCREASE_QUOTA_NAME,           VERR_PROC_IQ_PRIV_NOT_HELD  },
+        };
+        for (uint32_t i = 0; i < RT_ELEMENTS(s_aPrivileges); i++)
+        {
+            union
+            {
+                TOKEN_PRIVILEGES TokPriv;
+                char abAlloced[sizeof(TOKEN_PRIVILEGES) + sizeof(LUID_AND_ATTRIBUTES)];
+            } uNew, uOld;
+            uNew.TokPriv.PrivilegeCount = 1;
+            uNew.TokPriv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+            AssertContinue(LookupPrivilegeValue(NULL, s_aPrivileges[i].pszName, &uNew.TokPriv.Privileges[0].Luid));
+            uOld = uNew;
+            SetLastError(NO_ERROR);
+            DWORD cbActual = RT_UOFFSETOF(TOKEN_PRIVILEGES, Privileges[1]);
+            AdjustTokenPrivileges(hToken, FALSE /*fDisableAllPrivileges*/, &uNew.TokPriv, cbActual, &uOld.TokPriv, &cbActual);
+            if (GetLastError() != NO_ERROR)
+            {
+                CloseHandle(hToken);
+                return s_aPrivileges[i].rc;
+            }
+            if (uOld.TokPriv.Privileges[0].Attributes == 0)
+                AdjustTokenPrivileges(hToken, FALSE /*fDisableAllPrivileges*/, &uOld.TokPriv, 0, NULL, NULL);
+        }
+        AssertFailed();
+        CloseHandle(hToken);
+    }
+    else
+        AssertFailed();
+    return VERR_PRIVILEGE_NOT_HELD;
+}
+
+#if 0 /* debug code */
+
+static char *rtProcWinSidToString(char *psz, PSID pSid)
+{
+     char *pszRet = psz;
+
+     *psz++ = 'S';
+     *psz++ = '-';
+     *psz++ = '1';
+     *psz++ = '-';
+
+     PISID pISid = (PISID)pSid;
+
+     psz += RTStrFormatU32(psz, 32, RT_MAKE_U32_FROM_U8(pISid->IdentifierAuthority.Value[5],
+                                                        pISid->IdentifierAuthority.Value[4],
+                                                        pISid->IdentifierAuthority.Value[3],
+                                                        pISid->IdentifierAuthority.Value[2]),
+                           10, 0, 0, 0);
+     for (unsigned i = 0; i < pISid->SubAuthorityCount; i++)
+     {
+          *psz++ = '-';
+          psz += RTStrFormatU32(psz, 32, pISid->SubAuthority[i], 10, 0, 0, 0);
+     }
+     *psz++ = '\0';
+     return pszRet;
+}
+
+static void rtProcWinLogAcl(PACL pAcl)
+{
+    if (!pAcl)
+        RTAssertMsg2("ACL is NULL\n");
+    else
+    {
+        RTAssertMsg2("AceCount=%d AclSize=%#x AclRevision=%d\n", pAcl->AceCount, pAcl->AclSize, pAcl->AclRevision);
+        for (uint32_t i = 0; i < pAcl->AceCount; i++)
+        {
+            PACE_HEADER pAceHdr = NULL;
+            if (GetAce(pAcl, i, (PVOID *)&pAceHdr))
+            {
+                RTAssertMsg2(" ACE[%u]: Flags=%#x Type=%#x Size=%#x", i, pAceHdr->AceFlags, pAceHdr->AceType, pAceHdr->AceSize);
+                char szTmp[256];
+                if (pAceHdr->AceType == ACCESS_ALLOWED_ACE_TYPE)
+                    RTAssertMsg2(" Mask=%#x %s\n", ((ACCESS_ALLOWED_ACE *)pAceHdr)->Mask,
+                                 rtProcWinSidToString(szTmp, &((ACCESS_ALLOWED_ACE *)pAceHdr)->SidStart));
+                else
+                    RTAssertMsg2(" ACE[%u]: Flags=%#x Type=%#x Size=%#x\n", i, pAceHdr->AceFlags, pAceHdr->AceType, pAceHdr->AceSize);
+            }
+        }
+    }
+}
+
+static bool rtProcWinLogSecAttr(HANDLE hUserObj)
+{
+    /*
+     * Get the security descriptor for the user interface object.
+     */
+    uint32_t             cbSecDesc = _64K;
+    PSECURITY_DESCRIPTOR pSecDesc  = (PSECURITY_DESCRIPTOR)RTMemTmpAlloc(cbSecDesc);
+    SECURITY_INFORMATION SecInfo   = DACL_SECURITY_INFORMATION;
+    DWORD                cbNeeded;
+    AssertReturn(pSecDesc, false);
+    if (!GetUserObjectSecurity(hUserObj, &SecInfo, pSecDesc, cbSecDesc, &cbNeeded))
+    {
+        RTMemTmpFree(pSecDesc);
+        AssertReturn(GetLastError() == ERROR_INSUFFICIENT_BUFFER, false);
+        cbSecDesc = cbNeeded + 128;
+        pSecDesc  = (PSECURITY_DESCRIPTOR)RTMemTmpAlloc(cbSecDesc);
+        AssertReturn(pSecDesc, false);
+        if (!GetUserObjectSecurity(hUserObj, &SecInfo, pSecDesc, cbSecDesc, &cbNeeded))
+        {
+            RTMemTmpFree(pSecDesc);
+            AssertFailedReturn(false);
+        }
+    }
+
+    /*
+     * Get the discretionary access control list (if we have one).
+     */
+    BOOL fDaclDefaulted;
+    BOOL fDaclPresent;
+    PACL pDacl;
+    if (GetSecurityDescriptorDacl(pSecDesc, &fDaclPresent, &pDacl, &fDaclDefaulted))
+        rtProcWinLogAcl(pDacl);
+    else
+        RTAssertMsg2("GetSecurityDescriptorDacl failed\n");
+
+    RTMemFree(pSecDesc);
+    return true;
+}
+
+#endif /* debug */
+
+/**
+ * Get the user SID from a token.
+ *
+ * @returns Pointer to the SID on success. Free by calling RTMemFree.
+ * @param   hToken              The token..
+ * @param   prc                 Optional return code.
+ */
+static PSID rtProcWinGetTokenUserSid(HANDLE hToken, int *prc)
+{
+    int rcIgn;
+    if (!prc)
+        prc = &rcIgn;
+    *prc = VERR_NO_MEMORY;
+
+    /*
+     * Get the groups associated with the token.  We just try a size first then
+     * reallocates if it's insufficient.
+     */
+    DWORD       cbUser = _1K;
+    PTOKEN_USER pUser  = (PTOKEN_USER)RTMemTmpAlloc(cbUser);
+    AssertReturn(pUser, NULL);
+    DWORD cbNeeded = 0;
+    if (!GetTokenInformation(hToken, TokenUser, pUser, cbUser, &cbNeeded))
+    {
+        DWORD dwErr = GetLastError();
+        RTMemTmpFree(pUser);
+        AssertLogRelMsgReturnStmt(dwErr == ERROR_INSUFFICIENT_BUFFER,
+                                  ("rtProcWinGetTokenUserSid: GetTokenInformation failed with %u\n", dwErr),
+                                  *prc = RTErrConvertFromWin32(dwErr), NULL);
+        cbUser = cbNeeded + 128;
+        pUser = (PTOKEN_USER)RTMemTmpAlloc(cbUser);
+        AssertReturn(pUser, NULL);
+        if (!GetTokenInformation(hToken, TokenUser, pUser, cbUser, &cbNeeded))
+        {
+            dwErr = GetLastError();
+            *prc = RTErrConvertFromWin32(dwErr);
+            RTMemTmpFree(pUser);
+            AssertLogRelMsgFailedReturn(("rtProcWinGetTokenUserSid: GetTokenInformation failed with %u\n", dwErr), NULL);
+        }
+    }
+
+    DWORD cbSid = GetLengthSid(pUser->User.Sid);
+    PSID pSidRet = RTMemDup(pUser->User.Sid, cbSid);
+    Assert(pSidRet);
+    RTMemTmpFree(pUser);
+    *prc = VINF_SUCCESS;
+    return pSidRet;
+}
+
+
+#if 0 /* not used */
+/**
+ * Get the login SID from a token.
+ *
+ * @returns Pointer to the SID on success. Free by calling RTMemFree.
+ * @param   hToken              The token..
+ */
+static PSID rtProcWinGetTokenLogonSid(HANDLE hToken)
+{
+    /*
+     * Get the groups associated with the token.  We just try a size first then
+     * reallocates if it's insufficient.
+     */
+    DWORD         cbGroups = _1K;
+    PTOKEN_GROUPS pGroups = (PTOKEN_GROUPS)RTMemTmpAlloc(cbGroups);
+    AssertReturn(pGroups, NULL);
+    DWORD cbNeeded = 0;
+    if (!GetTokenInformation(hToken, TokenGroups, pGroups, cbGroups, &cbNeeded))
+    {
+        RTMemTmpFree(pGroups);
+        AssertReturn(GetLastError() == ERROR_INSUFFICIENT_BUFFER, NULL);
+        cbGroups = cbNeeded + 128;
+        pGroups = (PTOKEN_GROUPS)RTMemTmpAlloc(cbGroups);
+        AssertReturn(pGroups, NULL);
+        if (!GetTokenInformation(hToken, TokenGroups, pGroups, cbGroups, &cbNeeded))
+        {
+            RTMemTmpFree(pGroups);
+            AssertFailedReturn(NULL);
+        }
+    }
+
+    /*
+     * Locate the logon sid.
+     */
+    PSID     pSidRet = NULL;
+    uint32_t i = pGroups->GroupCount;
+    while (i-- > 0)
+        if ((pGroups->Groups[i].Attributes & SE_GROUP_LOGON_ID) == SE_GROUP_LOGON_ID)
+        {
+            DWORD cbSid = GetLengthSid(pGroups->Groups[i].Sid);
+            pSidRet = RTMemDup(pGroups->Groups[i].Sid, cbSid);
+            break;
+        }
+
+    RTMemTmpFree(pGroups);
+    Assert(pSidRet);
+    return pSidRet;
+}
+#endif /* unused */
+
+
+/**
+ * Retrieves the DACL security descriptor of the give GUI object.
+ *
+ * @returns Pointer to the security descriptor.
+ * @param   hUserObj        The GUI object handle.
+ * @param   pcbSecDesc      Where to return the size of the security descriptor.
+ * @param   ppDacl          Where to return the DACL pointer.
+ * @param   pfDaclPresent   Where to return the DACL-present indicator.
+ * @param   pDaclSizeInfo   Where to return the DACL size information.
+ */
+static PSECURITY_DESCRIPTOR rtProcWinGetUserObjDacl(HANDLE hUserObj, uint32_t *pcbSecDesc, PACL *ppDacl,
+                                                    BOOL *pfDaclPresent, ACL_SIZE_INFORMATION *pDaclSizeInfo)
+{
+    /*
+     * Get the security descriptor for the user interface object.
+     */
+    uint32_t             cbSecDesc = _1K;
+    PSECURITY_DESCRIPTOR pSecDesc  = (PSECURITY_DESCRIPTOR)RTMemTmpAlloc(cbSecDesc);
+    SECURITY_INFORMATION SecInfo   = DACL_SECURITY_INFORMATION;
+    DWORD                cbNeeded;
+    AssertReturn(pSecDesc, NULL);
+    if (!GetUserObjectSecurity(hUserObj, &SecInfo, pSecDesc, cbSecDesc, &cbNeeded))
+    {
+        RTMemTmpFree(pSecDesc);
+        AssertReturn(GetLastError() == ERROR_INSUFFICIENT_BUFFER, NULL);
+        cbSecDesc = cbNeeded + 128;
+        pSecDesc  = (PSECURITY_DESCRIPTOR)RTMemTmpAlloc(cbSecDesc);
+        AssertReturn(pSecDesc, NULL);
+        if (!GetUserObjectSecurity(hUserObj, &SecInfo, pSecDesc, cbSecDesc, &cbNeeded))
+        {
+            RTMemTmpFree(pSecDesc);
+            AssertFailedReturn(NULL);
+        }
+    }
+    *pcbSecDesc = cbNeeded;
+
+    /*
+     * Get the discretionary access control list (if we have one).
+     */
+    BOOL fDaclDefaulted;
+    if (GetSecurityDescriptorDacl(pSecDesc, pfDaclPresent, ppDacl, &fDaclDefaulted))
+    {
+        RT_ZERO(*pDaclSizeInfo);
+        pDaclSizeInfo->AclBytesInUse = sizeof(ACL);
+        if (   !*ppDacl
+            || GetAclInformation(*ppDacl, pDaclSizeInfo, sizeof(*pDaclSizeInfo), AclSizeInformation))
+            return pSecDesc;
+        AssertFailed();
+    }
+    else
+        AssertFailed();
+    RTMemTmpFree(pSecDesc);
+    return NULL;
+}
+
+
+/**
+ * Copy ACEs from one ACL to another.
+ *
+ * @returns true on success, false on failure.
+ * @param   pDst                The destination ACL.
+ * @param   pSrc                The source ACL.
+ * @param   cAces               The number of ACEs to copy.
+ */
+static bool rtProcWinCopyAces(PACL pDst, PACL pSrc, uint32_t cAces)
+{
+    for (uint32_t i = 0; i < cAces; i++)
+    {
+        PACE_HEADER pAceHdr;
+        AssertReturn(GetAce(pSrc, i, (PVOID *)&pAceHdr), false);
+        AssertReturn(AddAce(pDst, ACL_REVISION, MAXDWORD, pAceHdr, pAceHdr->AceSize), false);
+    }
+    return true;
+}
+
+
+/**
+ * Adds an access-allowed access control entry to an ACL.
+ *
+ * @returns true on success, false on failure.
+ * @param   pDstAcl             The ACL.
+ * @param   fAceFlags           The ACE flags.
+ * @param   fMask               The ACE access mask.
+ * @param   pSid                The SID to go with the ACE.
+ * @param   cbSid               The size of the SID.
+ */
+static bool rtProcWinAddAccessAllowedAce(PACL pDstAcl, uint32_t fAceFlags, uint32_t fMask, PSID pSid, uint32_t cbSid)
+{
+    struct
+    {
+        ACCESS_ALLOWED_ACE  Core;
+        DWORD               abPadding[128]; /* More than enough, AFAIK. */
+    } AceBuf;
+    RT_ZERO(AceBuf);
+    uint32_t const cbAllowedAce = RT_UOFFSETOF(ACCESS_ALLOWED_ACE, SidStart) + cbSid;
+    AssertReturn(cbAllowedAce <= sizeof(AceBuf), false);
+
+    AceBuf.Core.Header.AceSize     = cbAllowedAce;
+    AceBuf.Core.Header.AceType     = ACCESS_ALLOWED_ACE_TYPE;
+    AceBuf.Core.Header.AceFlags    = fAceFlags;
+    AceBuf.Core.Mask               = fMask;
+    AssertReturn(CopySid(cbSid, &AceBuf.Core.SidStart, pSid), false);
+
+    uint32_t i = pDstAcl->AceCount;
+    while (i-- > 0)
+    {
+        PACE_HEADER pAceHdr;
+        AssertContinue(GetAce(pDstAcl, i, (PVOID *)&pAceHdr));
+        if (   pAceHdr->AceSize == cbAllowedAce
+            && memcmp(pAceHdr, &AceBuf.Core, cbAllowedAce) == 0)
+            return true;
+
+    }
+    AssertMsgReturn(AddAce(pDstAcl, ACL_REVISION, MAXDWORD, &AceBuf.Core, cbAllowedAce), ("%u\n", GetLastError()), false);
+    return true;
+}
+
+
+/** All window station rights we know about   */
+#define MY_WINSTATION_ALL_RIGHTS (  WINSTA_ACCESSCLIPBOARD | WINSTA_ACCESSGLOBALATOMS | WINSTA_CREATEDESKTOP \
+                                  | WINSTA_ENUMDESKTOPS | WINSTA_ENUMERATE | WINSTA_EXITWINDOWS | WINSTA_READATTRIBUTES \
+                                  | WINSTA_READSCREEN | WINSTA_WRITEATTRIBUTES | DELETE | READ_CONTROL | WRITE_DAC | WRITE_OWNER )
+/** All desktop rights we know about   */
+#define MY_DESKTOP_ALL_RIGHTS    (  DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW | DESKTOP_ENUMERATE | DESKTOP_HOOKCONTROL \
+                                  | DESKTOP_JOURNALPLAYBACK | DESKTOP_JOURNALRECORD | DESKTOP_READOBJECTS \
+                                  | DESKTOP_SWITCHDESKTOP | DESKTOP_WRITEOBJECTS | DELETE | READ_CONTROL | WRITE_DAC \
+                                  | WRITE_OWNER )
+/** Generic rights. */
+#define MY_GENERIC_ALL_RIGHTS    ( GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL )
+
+
+/**
+ * Grants the given SID full access to the given window station.
+ *
+ * @returns true on success, false on failure.
+ * @param   hWinStation         The window station.
+ * @param   pSid                The SID.
+ */
+static bool rtProcWinAddSidToWinStation(HWINSTA hWinStation, PSID pSid)
+{
+    bool fRet = false;
+
+    /*
+     * Get the current DACL.
+     */
+    uint32_t                cbSecDesc;
+    PACL                    pDacl;
+    ACL_SIZE_INFORMATION    DaclSizeInfo;
+    BOOL                    fDaclPresent;
+    PSECURITY_DESCRIPTOR    pSecDesc = rtProcWinGetUserObjDacl(hWinStation, &cbSecDesc, &pDacl, &fDaclPresent, &DaclSizeInfo);
+    if (pSecDesc)
+    {
+        /*
+         * Create a new DACL. This will contain two extra ACEs.
+         */
+        PSECURITY_DESCRIPTOR pNewSecDesc = (PSECURITY_DESCRIPTOR)RTMemTmpAlloc(cbSecDesc);
+        if (   pNewSecDesc
+            && InitializeSecurityDescriptor(pNewSecDesc, SECURITY_DESCRIPTOR_REVISION))
+        {
+            uint32_t const cbSid     = GetLengthSid(pSid);
+            uint32_t const cbNewDacl = DaclSizeInfo.AclBytesInUse + (sizeof(ACCESS_ALLOWED_ACE) + cbSid) * 2;
+            PACL pNewDacl = (PACL)RTMemTmpAlloc(cbNewDacl);
+            if (   pNewDacl
+                && InitializeAcl(pNewDacl, cbNewDacl, ACL_REVISION)
+                && rtProcWinCopyAces(pNewDacl, pDacl, fDaclPresent ? DaclSizeInfo.AceCount : 0))
+            {
+                /*
+                 * Add the two new SID ACEs.
+                 */
+                if (   rtProcWinAddAccessAllowedAce(pNewDacl, CONTAINER_INHERIT_ACE | INHERIT_ONLY_ACE | OBJECT_INHERIT_ACE,
+                                                    MY_GENERIC_ALL_RIGHTS, pSid, cbSid)
+                    && rtProcWinAddAccessAllowedAce(pNewDacl, NO_PROPAGATE_INHERIT_ACE, MY_WINSTATION_ALL_RIGHTS, pSid, cbSid))
+                {
+                    /*
+                     * Now mate the new DECL with the security descriptor and set it.
+                     */
+                    if (SetSecurityDescriptorDacl(pNewSecDesc, TRUE /*fDaclPresent*/, pNewDacl, FALSE /*fDaclDefaulted*/))
+                    {
+                        SECURITY_INFORMATION SecInfo = DACL_SECURITY_INFORMATION;
+                        if (SetUserObjectSecurity(hWinStation, &SecInfo, pNewSecDesc))
+                            fRet = true;
+                        else
+                            AssertFailed();
+                    }
+                    else
+                        AssertFailed();
+                }
+                else
+                    AssertFailed();
+            }
+            else
+                AssertFailed();
+            RTMemTmpFree(pNewDacl);
+        }
+        else
+            AssertFailed();
+        RTMemTmpFree(pNewSecDesc);
+        RTMemTmpFree(pSecDesc);
+    }
+    return fRet;
+}
+
+
+/**
+ * Grants the given SID full access to the given desktop.
+ *
+ * @returns true on success, false on failure.
+ * @param   hDesktop            The desktop handle.
+ * @param   pSid                The SID.
+ */
+static bool rtProcWinAddSidToDesktop(HDESK hDesktop, PSID pSid)
+{
+    bool fRet = false;
+
+    /*
+     * Get the current DACL.
+     */
+    uint32_t                cbSecDesc;
+    PACL                    pDacl;
+    ACL_SIZE_INFORMATION    DaclSizeInfo;
+    BOOL                    fDaclPresent;
+    PSECURITY_DESCRIPTOR    pSecDesc = rtProcWinGetUserObjDacl(hDesktop, &cbSecDesc, &pDacl, &fDaclPresent, &DaclSizeInfo);
+    if (pSecDesc)
+    {
+        /*
+         * Create a new DACL. This will contain one extra ACE.
+         */
+        PSECURITY_DESCRIPTOR pNewSecDesc = (PSECURITY_DESCRIPTOR)RTMemTmpAlloc(cbSecDesc);
+        if (   pNewSecDesc
+            && InitializeSecurityDescriptor(pNewSecDesc, SECURITY_DESCRIPTOR_REVISION))
+        {
+            uint32_t const cbSid     = GetLengthSid(pSid);
+            uint32_t const cbNewDacl = DaclSizeInfo.AclBytesInUse + (sizeof(ACCESS_ALLOWED_ACE) + cbSid) * 1;
+            PACL pNewDacl = (PACL)RTMemTmpAlloc(cbNewDacl);
+            if (   pNewDacl
+                && InitializeAcl(pNewDacl, cbNewDacl, ACL_REVISION)
+                && rtProcWinCopyAces(pNewDacl, pDacl, fDaclPresent ? DaclSizeInfo.AceCount : 0))
+            {
+                /*
+                 * Add the new SID ACE.
+                 */
+                if (rtProcWinAddAccessAllowedAce(pNewDacl, 0 /*fAceFlags*/, MY_DESKTOP_ALL_RIGHTS, pSid, cbSid))
+                {
+                    /*
+                     * Now mate the new DECL with the security descriptor and set it.
+                     */
+                    if (SetSecurityDescriptorDacl(pNewSecDesc, TRUE /*fDaclPresent*/, pNewDacl, FALSE /*fDaclDefaulted*/))
+                    {
+                        SECURITY_INFORMATION SecInfo = DACL_SECURITY_INFORMATION;
+                        if (SetUserObjectSecurity(hDesktop, &SecInfo, pNewSecDesc))
+                            fRet = true;
+                        else
+                            AssertFailed();
+                    }
+                    else
+                        AssertFailed();
+                }
+                else
+                    AssertFailed();
+            }
+            else
+                AssertFailed();
+            RTMemTmpFree(pNewDacl);
+        }
+        else
+            AssertFailed();
+        RTMemTmpFree(pNewSecDesc);
+        RTMemTmpFree(pSecDesc);
+    }
+    return fRet;
+}
+
+
+/**
+ * Preps the window station and desktop for the new app.
+ *
+ * EXPERIMENTAL. Thus no return code.
+ *
+ * @param   hTokenToUse     The access token of the new process.
+ * @param   pStartupInfo    The startup info (we'll change lpDesktop, maybe).
+ * @param   phWinStationOld Where to return an window station handle to restore.
+ *                          Pass this to SetProcessWindowStation if not NULL.
+ */
+static void rtProcWinStationPrep(HANDLE hTokenToUse, STARTUPINFOW *pStartupInfo, HWINSTA *phWinStationOld)
+{
+    /** @todo Always mess with the interactive one? Maybe it's not there...  */
+    *phWinStationOld = GetProcessWindowStation();
+    HWINSTA hWinStation0;
+    if (g_pfnOpenWindowStationW)
+        hWinStation0 = g_pfnOpenWindowStationW(L"winsta0", FALSE /*fInherit*/, READ_CONTROL | WRITE_DAC);
+    else
+        hWinStation0 = OpenWindowStationA("winsta0", FALSE /*fInherit*/, READ_CONTROL | WRITE_DAC); /* (for NT3.1) */
+    if (hWinStation0)
+    {
+        if (SetProcessWindowStation(hWinStation0))
+        {
+            HDESK hDesktop = OpenDesktop("default", 0 /*fFlags*/, FALSE /*fInherit*/,
+                                         READ_CONTROL | WRITE_DAC | DESKTOP_WRITEOBJECTS | DESKTOP_READOBJECTS);
+            if (hDesktop)
+            {
+                /*PSID pSid = rtProcWinGetTokenLogonSid(hTokenToUse); - Better to use the user SID. Avoid overflowing the ACL. */
+                PSID pSid = rtProcWinGetTokenUserSid(hTokenToUse, NULL /*prc*/);
+                if (pSid)
+                {
+                    if (   rtProcWinAddSidToWinStation(hWinStation0, pSid)
+                        && rtProcWinAddSidToDesktop(hDesktop, pSid))
+                    {
+                        pStartupInfo->lpDesktop = L"winsta0\\default";
+                    }
+                    RTMemFree(pSid);
+                }
+                CloseDesktop(hDesktop);
+            }
+            else
+                AssertFailed();
+        }
+        else
+            AssertFailed();
+        if (g_pfnCloseWindowStation)
+            g_pfnCloseWindowStation(hWinStation0);
+    }
+    else
+        AssertFailed();
+}
+
+
+/**
+ * Extracts the user name + domain from a given UPN (User Principal Name, "joedoe@example.com") or
+ * Down-Level Logon Name format ("example.com\\joedoe") string.
+ *
+ * @return  IPRT status code.
+ * @param   pwszString      Pointer to string to extract the account info from.
+ * @param   pAccountInfo    Where to store the parsed account info.
+ *                          Must be free'd with rtProcWinFreeAccountInfo().
+ */
+static int rtProcWinParseAccountInfo(PRTUTF16 pwszString, PRTPROCWINACCOUNTINFO pAccountInfo)
+{
+    AssertPtrReturn(pwszString,   VERR_INVALID_POINTER);
+    AssertPtrReturn(pAccountInfo, VERR_INVALID_POINTER);
+
+    /*
+     * Note: UPN handling is defined in RFC 822. We only implement very rudimentary parsing for the user
+     *       name and domain fields though.
+     */
+    char *pszString;
+    int rc = RTUtf16ToUtf8(pwszString, &pszString);
+    if (RT_SUCCESS(rc))
+    {
+        do
+        {
+            /* UPN or FQDN handling needed? */
+            /** @todo Add more validation here as needed. Regular expressions would be nice. */
+            char *pszDelim = strchr(pszString, '@');
+            if (pszDelim) /* UPN name? */
+            {
+                rc = RTStrToUtf16Ex(pszString, pszDelim - pszString, &pAccountInfo->pwszUserName, 0, NULL);
+                if (RT_FAILURE(rc))
+                    break;
+
+                rc = RTStrToUtf16Ex(pszDelim + 1, RTSTR_MAX, &pAccountInfo->pwszDomain, 0, NULL);
+                if (RT_FAILURE(rc))
+                    break;
+            }
+            else if (pszDelim = strchr(pszString, '\\')) /* FQDN name? */
+            {
+                rc = RTStrToUtf16Ex(pszString, pszDelim - pszString, &pAccountInfo->pwszDomain, 0, NULL);
+                if (RT_FAILURE(rc))
+                    break;
+
+                rc = RTStrToUtf16Ex(pszDelim + 1, RTSTR_MAX, &pAccountInfo->pwszUserName, 0, NULL);
+                if (RT_FAILURE(rc))
+                    break;
+            }
+            else
+                rc = VERR_NOT_SUPPORTED;
+
+        } while (0);
+
+        RTStrFree(pszString);
+    }
+
+#ifdef DEBUG
+    LogRelFunc(("Name  : %ls\n", pAccountInfo->pwszUserName));
+    LogRelFunc(("Domain: %ls\n", pAccountInfo->pwszDomain));
+#endif
+
+    if (RT_FAILURE(rc))
+        LogRelFunc(("Parsing \"%ls\" failed with rc=%Rrc\n", pwszString, rc));
+    return rc;
+}
+
+
+static void rtProcWinFreeAccountInfo(PRTPROCWINACCOUNTINFO pAccountInfo)
+{
+    if (!pAccountInfo)
+        return;
+
+    if (pAccountInfo->pwszUserName)
+    {
+        RTUtf16Free(pAccountInfo->pwszUserName);
+        pAccountInfo->pwszUserName = NULL;
+    }
+
+    if (pAccountInfo->pwszDomain)
+    {
+        RTUtf16Free(pAccountInfo->pwszDomain);
+        pAccountInfo->pwszDomain = NULL;
+    }
+}
+
+
+/**
+ * Tries to resolve the name of the SID.
+ *
+ * @returns IPRT status code.
+ * @param   pSid        The SID to resolve.
+ * @param   ppwszName   Where to return the name. Use RTUtf16Free to free.
+ */
+static int rtProcWinSidToName(PSID pSid, PRTUTF16 *ppwszName)
+{
+    *ppwszName = NULL;
+
+    /*
+     * Use large initial buffers here to try avoid having to repeat the call.
+     */
+    DWORD cwcAllocated = 512;
+    while (cwcAllocated < _32K)
+    {
+        PRTUTF16 pwszName = RTUtf16Alloc(cwcAllocated * sizeof(RTUTF16));
+        AssertReturn(pwszName, VERR_NO_UTF16_MEMORY);
+        PRTUTF16 pwszDomain = RTUtf16Alloc(cwcAllocated * sizeof(RTUTF16));
+        AssertReturnStmt(pwszDomain, RTUtf16Free(pwszName), VERR_NO_UTF16_MEMORY);
+
+        DWORD cwcName   = cwcAllocated;
+        DWORD cwcDomain = cwcAllocated;
+        SID_NAME_USE SidNameUse = SidTypeUser;
+        if (LookupAccountSidW(NULL /*lpSystemName*/, pSid, pwszName, &cwcName, pwszDomain, &cwcDomain, &SidNameUse))
+        {
+            *ppwszName = pwszName;
+            RTUtf16Free(pwszDomain); /* may need this later. */
+            return VINF_SUCCESS;
+        }
+
+        DWORD const dwErr = GetLastError();
+        RTUtf16Free(pwszName);
+        RTUtf16Free(pwszDomain);
+        if (dwErr != ERROR_INSUFFICIENT_BUFFER)
+            return RTErrConvertFromWin32(dwErr);
+        cwcAllocated = RT_MAX(cwcName, cwcDomain) + 1;
+    }
+
+    return RTErrConvertFromWin32(ERROR_INSUFFICIENT_BUFFER);
+}
+
+
+/**
+ * Tries to resolve the user name for the token.
+ *
+ * @returns IPRT status code.
+ * @param   hToken      The token.
+ * @param   ppwszUser   Where to return the username. Use RTUtf16Free to free.
+ */
+static int rtProcWinTokenToUsername(HANDLE hToken, PRTUTF16 *ppwszUser)
+{
+    int rc = VINF_SUCCESS;
+    PSID pSid = rtProcWinGetTokenUserSid(hToken, &rc);
+    if (pSid)
+    {
+        rc = rtProcWinSidToName(pSid, ppwszUser);
+        RTMemFree(pSid);
+    }
+    else
+        *ppwszUser = NULL;
+    return rc;
+}
+
+
+/**
+ * Method \#2.
+ *
+ * @note pwszUser can be NULL when RTPROC_FLAGS_AS_IMPERSONATED_TOKEN is set.
+ */
+static int rtProcWinCreateAsUser2(PRTUTF16 pwszUser, PRTUTF16 pwszPassword, PRTUTF16 *ppwszExec, PRTUTF16 pwszCmdLine,
+                                  RTENV hEnv, DWORD dwCreationFlags,
+                                  STARTUPINFOW *pStartupInfo, PROCESS_INFORMATION *pProcInfo,
+                                  uint32_t fFlags, const char *pszExec, uint32_t idDesiredSession)
+{
+    /*
+     * So if we want to start a process from a service (RTPROC_FLAGS_SERVICE),
+     * we have to do the following:
+     * - Check the credentials supplied and get the user SID.
+     * - If valid get the correct Explorer/VBoxTray instance corresponding to that
+     *   user. This of course is only possible if that user is logged in (over
+     *   physical console or terminal services).
+     * - If we found the user's Explorer/VBoxTray app, use and modify the token to
+     *   use it in order to allow the newly started process to access the user's
+     *   desktop. If there's no Explorer/VBoxTray app we cannot display the started
+     *   process (but run it without UI).
+     *
+     * The following restrictions apply:
+     * - A process only can show its UI when the user the process should run
+     *   under is logged in (has a desktop).
+     * - We do not want to display a process of user A run on the desktop
+     *   of user B on multi session systems.
+     *
+     * The following rights are needed in order to use LogonUserW and
+     * CreateProcessAsUserW, so the local policy has to be modified to:
+     *  - SE_TCB_NAME                = Act as part of the operating system
+     *  - SE_ASSIGNPRIMARYTOKEN_NAME = Create/replace a (process) token object
+     *  - SE_INCREASE_QUOTA_NAME     = Increase quotas
+     *
+     * We may fail here with ERROR_PRIVILEGE_NOT_HELD.
+     */
+    DWORD   dwErr       = NO_ERROR;
+    HANDLE  hTokenLogon = INVALID_HANDLE_VALUE;
+    int rc;
+    if (fFlags & RTPROC_FLAGS_AS_IMPERSONATED_TOKEN)
+        rc = rtProcWinGetThreadTokenHandle(GetCurrentThread(), &hTokenLogon);
+    else if (pwszUser == NULL)
+        rc = rtProcWinGetProcessTokenHandle(GetCurrentProcess(), &hTokenLogon);
+    else
+        rc = rtProcWinUserLogon(pwszUser, pwszPassword, &hTokenLogon);
+    if (RT_SUCCESS(rc))
+    {
+        BOOL   fRc;
+        bool   fFound = false;
+        HANDLE hTokenUserDesktop = INVALID_HANDLE_VALUE;
+
+        /*
+         * If the SERVICE flag is specified, we do something rather ugly to
+         * make things work at all.  We search for a known desktop process
+         * belonging to the user, grab its token and use it for launching
+         * the new process.  That way the process will have desktop access.
+         */
+        if (fFlags & RTPROC_FLAGS_SERVICE)
+        {
+            /*
+             * For the token search we need a SID.
+             */
+            PSID pSid = rtProcWinGetTokenUserSid(hTokenLogon, &rc);
+
+            /*
+             * If we got a valid SID, search the running processes.
+             */
+            /*
+             * If we got a valid SID, search the running processes.
+             */
+            if (pSid)
+            {
+                if (IsValidSid(pSid))
+                {
+                    /* Array of process names we want to look for. */
+                    static const char * const s_papszProcNames[] =
+                    {
+#ifdef VBOX             /* The explorer entry is a fallback in case GA aren't installed. */
+                        { "VBoxTray.exe" },
+# ifndef IN_GUEST
+                        { "VirtualBox.exe" },
+# endif
+#endif
+                        { "explorer.exe" },
+                        NULL
+                    };
+                    fFound = rtProcWinFindTokenByProcess(s_papszProcNames, pSid, idDesiredSession, &hTokenUserDesktop);
+                    dwErr  = 0;
+                }
+                else
+                {
+                    dwErr = GetLastError();
+                    LogRelFunc(("SID is invalid: %ld\n", dwErr));
+                    rc = dwErr != NO_ERROR ? RTErrConvertFromWin32(dwErr) : VERR_INTERNAL_ERROR_3;
+                }
+
+                RTMemFree(pSid);
+            }
+        }
+        /* else: !RTPROC_FLAGS_SERVICE: Nothing to do here right now. */
+
+#if 0
+        /*
+         * If we make LogonUserW to return an impersonation token, enable this
+         * to convert it into a primary token.
+         */
+        if (!fFound && detect-impersonation-token)
+        {
+            HANDLE hNewToken;
+            if (DuplicateTokenEx(hTokenLogon, MAXIMUM_ALLOWED, NULL /*SecurityAttribs*/,
+                                 SecurityIdentification, TokenPrimary, &hNewToken))
+            {
+                CloseHandle(hTokenLogon);
+                hTokenLogon = hNewToken;
+            }
+            else
+                AssertMsgFailed(("%d\n", GetLastError()));
+        }
+#endif
+
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * If we didn't find a matching VBoxTray, just use the token we got
+             * above from LogonUserW().  This enables us to at least run processes
+             * with desktop interaction without UI.
+             */
+            HANDLE hTokenToUse = fFound ? hTokenUserDesktop : hTokenLogon;
+            if (   !(fFlags & RTPROC_FLAGS_PROFILE)
+                || (g_pfnUnloadUserProfile && g_pfnLoadUserProfileW) )
+            {
+                /*
+                 * Load the profile, if requested.  (Must be done prior to creating the enviornment.)
+                 *
+                 * Note! We don't have sufficient rights when impersonating a user, but we can
+                 *       ASSUME the user is logged on and has its profile loaded into HKEY_USERS already.
+                 */
+                PROFILEINFOW ProfileInfo;
+                PRTUTF16     pwszUserFree = NULL;
+                RT_ZERO(ProfileInfo);
+                /** @todo r=bird: We probably don't need to load anything if pwszUser is NULL... */
+                if ((fFlags & (RTPROC_FLAGS_PROFILE | RTPROC_FLAGS_AS_IMPERSONATED_TOKEN)) == RTPROC_FLAGS_PROFILE)
+                {
+                    if (!pwszUser)
+                    {
+                        Assert(fFlags & RTPROC_FLAGS_AS_IMPERSONATED_TOKEN);
+                        rc = rtProcWinTokenToUsername(hTokenToUse, &pwszUserFree);
+                        pwszUser = pwszUserFree;
+                    }
+                    if (RT_SUCCESS(rc))
+                    {
+                        ProfileInfo.dwSize     = sizeof(ProfileInfo);
+                        ProfileInfo.dwFlags    = PI_NOUI; /* Prevents the display of profile error messages. */
+                        ProfileInfo.lpUserName = pwszUser;
+                        if (!g_pfnLoadUserProfileW(hTokenToUse, &ProfileInfo))
+                            rc = RTErrConvertFromWin32(GetLastError());
+                    }
+                }
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Create the environment.
+                     */
+                    RTENV hEnvFinal;
+                    rc = rtProcWinCreateEnvFromToken(hTokenToUse, hEnv, fFlags, &hEnvFinal);
+                    if (RT_SUCCESS(rc))
+                    {
+                        PRTUTF16 pwszzBlock;
+                        rc = RTEnvQueryUtf16Block(hEnvFinal, &pwszzBlock);
+                        if (RT_SUCCESS(rc))
+                        {
+                            rc = rtProcWinFindExe(fFlags, hEnv, pszExec, ppwszExec);
+                            if (RT_SUCCESS(rc))
+                            {
+                                HWINSTA hOldWinStation = NULL;
+                                if (   !fFound
+                                    && g_enmWinVer <= kRTWinOSType_NT4) /** @todo test newer versions... */
+                                    rtProcWinStationPrep(hTokenToUse, pStartupInfo, &hOldWinStation);
+
+                                /*
+                                 * Useful KB articles:
+                                 *      http://support.microsoft.com/kb/165194/
+                                 *      http://support.microsoft.com/kb/184802/
+                                 *      http://support.microsoft.com/kb/327618/
+                                 */
+                                if (g_pfnCreateProcessAsUserW)
+                                {
+                                    fRc = g_pfnCreateProcessAsUserW(hTokenToUse,
+                                                                    *ppwszExec,
+                                                                    pwszCmdLine,
+                                                                    NULL,         /* pProcessAttributes */
+                                                                    NULL,         /* pThreadAttributes */
+                                                                    TRUE,         /* fInheritHandles */
+                                                                    dwCreationFlags,
+                                                                    /** @todo Warn about exceeding 8192 bytes
+                                                                     *        on XP and up. */
+                                                                    pwszzBlock,   /* lpEnvironment */
+                                                                    NULL,         /* pCurrentDirectory */
+                                                                    pStartupInfo,
+                                                                    pProcInfo);
+                                    if (fRc)
+                                        rc = VINF_SUCCESS;
+                                    else
+                                    {
+                                        dwErr = GetLastError();
+                                        if (dwErr == ERROR_PRIVILEGE_NOT_HELD)
+                                            rc = rtProcWinFigureWhichPrivilegeNotHeld2();
+                                        else
+                                            rc = RTErrConvertFromWin32(dwErr);
+                                    }
+                                }
+                                else
+                                    rc = VERR_NOT_SUPPORTED;
+
+                                if (hOldWinStation)
+                                    SetProcessWindowStation(hOldWinStation);
+                            }
+                            RTEnvFreeUtf16Block(pwszzBlock);
+                        }
+
+                        if (hEnvFinal != hEnv)
+                            RTEnvDestroy(hEnvFinal);
+                    }
+
+                    if ((fFlags & RTPROC_FLAGS_PROFILE) && ProfileInfo.hProfile)
+                    {
+                        fRc = g_pfnUnloadUserProfile(hTokenToUse, ProfileInfo.hProfile);
+#ifdef RT_STRICT
+                        if (!fRc)
+                        {
+                            DWORD dwErr2 = GetLastError();
+                            AssertMsgFailed(("Unloading user profile failed with error %u (%#x) - Are all handles closed? (dwErr=%u)",
+                                             dwErr2, dwErr2, dwErr));
+                        }
+#endif
+                    }
+                    if (pwszUserFree)
+                        RTUtf16Free(pwszUserFree);
+                }
+            }
+            else
+                rc = VERR_SYMBOL_NOT_FOUND;
+        } /* Account lookup succeeded? */
+
+        if (hTokenUserDesktop != INVALID_HANDLE_VALUE)
+            CloseHandle(hTokenUserDesktop);
+        if (hTokenLogon != INVALID_HANDLE_VALUE)
+            CloseHandle(hTokenLogon);
+
+        if (rc == VERR_UNRESOLVED_ERROR)
+            LogRelFunc(("dwErr=%u (%#x), rc=%Rrc\n", dwErr, dwErr, rc));
+    }
+
+    return rc;
+}
+
+
+/**
+ * Plants a standard handle into a child process on older windows versions.
+ *
+ * This is only needed when using CreateProcessWithLogonW on older windows
+ * versions.  It would appear that newer versions of windows does this for us.
+ *
+ * @param   hSrcHandle              The source handle.
+ * @param   hDstProcess             The child process handle.
+ * @param   offProcParamMember      The offset to RTL_USER_PROCESS_PARAMETERS.
+ * @param   ppvDstProcParamCache    Where where cached the address of
+ *                                  RTL_USER_PROCESS_PARAMETERS in the child.
+ */
+static void rtProcWinDupStdHandleIntoChild(HANDLE hSrcHandle, HANDLE hDstProcess, uint32_t offProcParamMember,
+                                           PVOID *ppvDstProcParamCache)
+{
+    if (hSrcHandle != NULL && hSrcHandle != INVALID_HANDLE_VALUE)
+    {
+        HANDLE hDstHandle;
+        if (DuplicateHandle(GetCurrentProcess(), hSrcHandle, hDstProcess, &hDstHandle,
+                            0 /*IgnoredDesiredAccess*/, FALSE /*fInherit*/, DUPLICATE_SAME_ACCESS))
+        {
+            if (hSrcHandle == hDstHandle)
+                return;
+
+            if (!*ppvDstProcParamCache)
+            {
+                PROCESS_BASIC_INFORMATION BasicInfo;
+                ULONG cbIgn;
+                NTSTATUS rcNt = NtQueryInformationProcess(hDstProcess, ProcessBasicInformation,
+                                                          &BasicInfo, sizeof(BasicInfo), &cbIgn);
+                if (NT_SUCCESS(rcNt))
+                {
+                    SIZE_T cbCopied = 0;
+                    if (!ReadProcessMemory(hDstProcess,
+                                           (char *)BasicInfo.PebBaseAddress + RT_UOFFSETOF(PEB_COMMON, ProcessParameters),
+                                           ppvDstProcParamCache, sizeof(*ppvDstProcParamCache), &cbCopied))
+                    {
+                        AssertMsgFailed(("PebBaseAddress=%p %d\n", BasicInfo.PebBaseAddress, GetLastError()));
+                        *ppvDstProcParamCache = NULL;
+                    }
+                }
+                else
+                    AssertMsgFailed(("rcNt=%#x\n", rcNt));
+            }
+            if (*ppvDstProcParamCache)
+            {
+                if (WriteProcessMemory(hDstProcess, (char *)*ppvDstProcParamCache + offProcParamMember,
+                                       &hDstHandle, sizeof(hDstHandle), NULL))
+                    return;
+            }
+
+            /*
+             * Close the handle.
+             */
+            HANDLE hSrcHandle2;
+            if (DuplicateHandle(hDstProcess, hDstHandle, GetCurrentProcess(), &hSrcHandle2,
+                                0 /*IgnoredDesiredAccess*/, FALSE /*fInherit*/, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE))
+                CloseHandle(hSrcHandle2);
+            else
+                AssertMsgFailed(("hDstHandle=%p %u\n", hDstHandle, GetLastError()));
+        }
+        else
+            AssertMsg(GetLastError() == ERROR_INVALID_PARAMETER, ("%u\n", GetLastError()));
+    }
+}
+
+
+/**
+ * Method \#1.
+ *
+ * This method requires Windows 2000 or later.  It may fail if the process is
+ * running under the SYSTEM account (like a service, ERROR_ACCESS_DENIED) on
+ * newer platforms (however, this works on W2K!).
+ */
+static int rtProcWinCreateAsUser1(PRTUTF16 pwszUser, PRTUTF16 pwszPassword, PRTUTF16 *ppwszExec, PRTUTF16 pwszCmdLine,
+                                  RTENV hEnv, DWORD dwCreationFlags,
+                                  STARTUPINFOW *pStartupInfo, PROCESS_INFORMATION *pProcInfo,
+                                  uint32_t fFlags, const char *pszExec)
+{
+    /* The CreateProcessWithLogonW API was introduced with W2K and later.  It uses a service
+       for launching the process. */
+    if (!g_pfnCreateProcessWithLogonW)
+        return VERR_SYMBOL_NOT_FOUND;
+
+    /*
+     * Create the environment block and find the executable first.
+     *
+     * We try to skip this when RTPROC_FLAGS_PROFILE is set so we can sidestep
+     * potential missing TCB privilege issues when calling UserLogonW.  At least
+     * NT4 and W2K requires the trusted code base (TCB) privilege for logon use.
+     * Passing pwszzBlock=NULL and LOGON_WITH_PROFILE means the child process
+     * gets the environment specified by the user profile.
+     */
+    int      rc;
+    PRTUTF16 pwszzBlock = NULL;
+
+    /* Eliminating the path search flags simplifies things a little. */
+    if (   (fFlags & RTPROC_FLAGS_SEARCH_PATH)
+        && (RTPathHasPath(pszExec) || RTPathExists(pszExec)))
+        fFlags &= ~RTPROC_FLAGS_SEARCH_PATH;
+
+    /*
+     * No profile is simple, as is a user specified environment (no change record).
+     */
+    if (   !(fFlags & RTPROC_FLAGS_PROFILE)
+        || (   !(fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD)
+            && hEnv != RTENV_DEFAULT))
+        rc = rtProcWinCreateEnvBlockAndFindExe(fFlags, hEnv, pszExec, &pwszzBlock, ppwszExec);
+    /*
+     * Default profile environment without changes or path searching we leave
+     * to the service that implements the API.
+     */
+    else if (   hEnv == RTENV_DEFAULT
+             && !(fFlags & (RTPROC_FLAGS_ENV_CHANGE_RECORD | RTPROC_FLAGS_SEARCH_PATH)))
+    {
+        pwszzBlock = NULL;
+        rc = VINF_SUCCESS;
+    }
+    /*
+     * Otherwise, we need to get the user profile environment.
+     */
+    else
+    {
+        RTENV  hEnvToUse   = NIL_RTENV;
+        HANDLE hTokenLogon = INVALID_HANDLE_VALUE;
+        rc = rtProcWinUserLogon(pwszUser, pwszPassword, &hTokenLogon);
+        if (RT_SUCCESS(rc))
+        {
+            /* CreateEnvFromToken docs says we should load the profile, though
+               we haven't observed any difference when not doing it.  Maybe it's
+               only an issue with roaming profiles or something similar... */
+            PROFILEINFOW ProfileInfo;
+            RT_ZERO(ProfileInfo);
+            ProfileInfo.dwSize     = sizeof(ProfileInfo);
+            ProfileInfo.lpUserName = pwszUser;
+            ProfileInfo.dwFlags    = PI_NOUI; /* Prevents the display of profile error messages. */
+
+            if (g_pfnLoadUserProfileW(hTokenLogon, &ProfileInfo))
+            {
+                /*
+                 * Do what we need to do.  Don't keep any temp environment object.
+                 */
+                rc = rtProcWinCreateEnvFromToken(hTokenLogon, hEnv, fFlags, &hEnvToUse);
+                if (RT_SUCCESS(rc))
+                {
+                    rc = rtProcWinFindExe(fFlags, hEnv, pszExec, ppwszExec);
+                    if (RT_SUCCESS(rc))
+                        rc = RTEnvQueryUtf16Block(hEnvToUse, &pwszzBlock);
+                    if (hEnvToUse != hEnv)
+                        RTEnvDestroy(hEnvToUse);
+                }
+
+                if (!g_pfnUnloadUserProfile(hTokenLogon, ProfileInfo.hProfile))
+                    AssertFailed();
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+
+            if (hTokenLogon != INVALID_HANDLE_VALUE)
+                CloseHandle(hTokenLogon);
+        }
+    }
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Create the process.
+         */
+        Assert(!(dwCreationFlags & CREATE_SUSPENDED));
+        bool const fCreatedSuspended = g_enmWinVer < kRTWinOSType_XP;
+        BOOL fRc = g_pfnCreateProcessWithLogonW(pwszUser,
+                                                NULL,                       /* lpDomain*/
+                                                pwszPassword,
+                                                fFlags & RTPROC_FLAGS_PROFILE ? 1 /*LOGON_WITH_PROFILE*/ : 0,
+                                                *ppwszExec,
+                                                pwszCmdLine,
+                                                dwCreationFlags | (fCreatedSuspended ? CREATE_SUSPENDED : 0),
+                                                pwszzBlock,
+                                                NULL,                       /* pCurrentDirectory */
+                                                pStartupInfo,
+                                                pProcInfo);
+        if (fRc)
+        {
+            if (!fCreatedSuspended)
+                rc = VINF_SUCCESS;
+            else
+            {
+                /*
+                 * Duplicate standard handles into the child process, we ignore failures here as it's
+                 * legal to have bad standard handle values and we cannot dup console I/O handles.*
+                 */
+                PVOID pvDstProcParamCache = NULL;
+                rtProcWinDupStdHandleIntoChild(pStartupInfo->hStdInput, pProcInfo->hProcess,
+                                               RT_UOFFSETOF(RTL_USER_PROCESS_PARAMETERS, StandardInput), &pvDstProcParamCache);
+                rtProcWinDupStdHandleIntoChild(pStartupInfo->hStdOutput, pProcInfo->hProcess,
+                                               RT_UOFFSETOF(RTL_USER_PROCESS_PARAMETERS, StandardOutput), &pvDstProcParamCache);
+                rtProcWinDupStdHandleIntoChild(pStartupInfo->hStdError,  pProcInfo->hProcess,
+                                               RT_UOFFSETOF(RTL_USER_PROCESS_PARAMETERS, StandardError), &pvDstProcParamCache);
+
+                if (ResumeThread(pProcInfo->hThread) != ~(DWORD)0)
+                    rc = VINF_SUCCESS;
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+                if (RT_FAILURE(rc))
+                {
+                    TerminateProcess(pProcInfo->hProcess, 127);
+                    CloseHandle(pProcInfo->hThread);
+                    CloseHandle(pProcInfo->hProcess);
+                }
+            }
+        }
+        else
+        {
+            DWORD dwErr = GetLastError();
+            rc = RTErrConvertFromWin32(dwErr);
+            if (rc == VERR_UNRESOLVED_ERROR)
+                LogRelFunc(("CreateProcessWithLogonW (%p) failed: dwErr=%u (%#x), rc=%Rrc\n",
+                            g_pfnCreateProcessWithLogonW, dwErr, dwErr, rc));
+        }
+        if (pwszzBlock)
+            RTEnvFreeUtf16Block(pwszzBlock);
+    }
+    return rc;
+}
+
+
+static int rtProcWinCreateAsUser(PRTUTF16 pwszUser, PRTUTF16 pwszPassword, PRTUTF16 *ppwszExec, PRTUTF16 pwszCmdLine,
+                                 RTENV hEnv, DWORD dwCreationFlags,
+                                 STARTUPINFOW *pStartupInfo, PROCESS_INFORMATION *pProcInfo,
+                                 uint32_t fFlags, const char *pszExec, uint32_t idDesiredSession)
+{
+    /*
+     * If we run as a service CreateProcessWithLogon will fail, so don't even
+     * try it (because of Local System context).  If we got an impersonated token
+     * we should use, we also have to have to skip over this approach.
+     * Note! This method is very slow on W2K.
+     */
+    if (!(fFlags & (RTPROC_FLAGS_SERVICE | RTPROC_FLAGS_AS_IMPERSONATED_TOKEN)))
+    {
+        AssertPtr(pwszUser);
+        int rc = rtProcWinCreateAsUser1(pwszUser, pwszPassword, ppwszExec, pwszCmdLine,
+                                        hEnv, dwCreationFlags, pStartupInfo, pProcInfo, fFlags, pszExec);
+        if (RT_SUCCESS(rc))
+            return rc;
+    }
+    return rtProcWinCreateAsUser2(pwszUser, pwszPassword, ppwszExec, pwszCmdLine,
+                                  hEnv, dwCreationFlags, pStartupInfo, pProcInfo, fFlags, pszExec, idDesiredSession);
+}
+
+
+/**
+ * RTPathTraverseList callback used by rtProcWinFindExe to locate the
+ * executable.
+ */
+static DECLCALLBACK(int) rtPathFindExec(char const *pchPath, size_t cchPath, void *pvUser1, void *pvUser2)
+{
+    const char *pszExec     = (const char *)pvUser1;
+    char       *pszRealExec = (char *)pvUser2;
+    int rc = RTPathJoinEx(pszRealExec, RTPATH_MAX, pchPath, cchPath, pszExec, RTSTR_MAX);
+    if (RT_FAILURE(rc))
+        return rc;
+    if (RTFileExists(pszRealExec))
+        return VINF_SUCCESS;
+    return VERR_TRY_AGAIN;
+}
+
+
+/**
+ * Locate the executable file if necessary.
+ *
+ * @returns IPRT status code.
+ * @param   pszExec         The UTF-8 executable string passed in by the user.
+ * @param   fFlags          The process creation flags pass in by the user.
+ * @param   hEnv            The environment to get the path variabel from.
+ * @param   ppwszExec       Pointer to the variable pointing to the UTF-16
+ *                          converted string.  If we find something, the current
+ *                          pointer will be free (RTUtf16Free) and
+ *                          replaced by a new one.
+ */
+static int rtProcWinFindExe(uint32_t fFlags, RTENV hEnv, const char *pszExec, PRTUTF16 *ppwszExec)
+{
+    /*
+     * Return immediately if we're not asked to search, or if the file has a
+     * path already or if it actually exists in the current directory.
+     */
+    if (   !(fFlags & RTPROC_FLAGS_SEARCH_PATH)
+        || RTPathHavePath(pszExec)
+        || RTPathExists(pszExec) )
+        return VINF_SUCCESS;
+
+    /*
+     * Search the Path or PATH variable for the file.
+     */
+    char *pszPath;
+    if (RTEnvExistEx(hEnv, "PATH"))
+        pszPath = RTEnvDupEx(hEnv, "PATH");
+    else if (RTEnvExistEx(hEnv, "Path"))
+        pszPath = RTEnvDupEx(hEnv, "Path");
+    else
+        return VERR_FILE_NOT_FOUND;
+
+    char szRealExec[RTPATH_MAX];
+    int rc = RTPathTraverseList(pszPath, ';', rtPathFindExec, (void *)pszExec, &szRealExec[0]);
+    RTStrFree(pszPath);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Replace the executable string.
+         */
+        RTPathWinFree(*ppwszExec);
+        *ppwszExec = NULL;
+        rc = RTPathWinFromUtf8(ppwszExec, szRealExec, 0 /*fFlags*/);
+    }
+    else if (rc == VERR_END_OF_STRING)
+        rc = VERR_FILE_NOT_FOUND;
+    return rc;
+}
+
+
+/**
+ * Creates the UTF-16 environment block and, if necessary, find the executable.
+ *
+ * @returns IPRT status code.
+ * @param   fFlags          The process creation flags pass in by the user.
+ * @param   hEnv            The environment handle passed by the user.
+ * @param   pszExec         See rtProcWinFindExe.
+ * @param   ppwszzBlock     Where RTEnvQueryUtf16Block returns the block.
+ * @param   ppwszExec       See rtProcWinFindExe.
+ */
+static int rtProcWinCreateEnvBlockAndFindExe(uint32_t fFlags, RTENV hEnv, const char *pszExec,
+                                             PRTUTF16 *ppwszzBlock, PRTUTF16 *ppwszExec)
+{
+    int rc;
+
+    /*
+     * In most cases, we just need to convert the incoming enviornment to a
+     * UTF-16 environment block.
+     */
+    RTENV hEnvToUse = NIL_RTENV; /* (MSC maybe used uninitialized) */
+    if (   !(fFlags & (RTPROC_FLAGS_PROFILE | RTPROC_FLAGS_ENV_CHANGE_RECORD))
+        || (hEnv == RTENV_DEFAULT && !(fFlags & RTPROC_FLAGS_PROFILE))
+        || (hEnv != RTENV_DEFAULT && !(fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD)) )
+    {
+        hEnvToUse = hEnv;
+        rc = VINF_SUCCESS;
+    }
+    else if (fFlags & RTPROC_FLAGS_PROFILE)
+    {
+        /*
+         * We need to get the profile environment for the current user.
+         */
+        Assert((fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD) || hEnv == RTENV_DEFAULT);
+        AssertReturn(g_pfnCreateEnvironmentBlock && g_pfnDestroyEnvironmentBlock, VERR_SYMBOL_NOT_FOUND);
+        AssertReturn(g_pfnLoadUserProfileW && g_pfnUnloadUserProfile, VERR_SYMBOL_NOT_FOUND);
+        HANDLE hToken;
+        if (OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_DUPLICATE | TOKEN_IMPERSONATE, &hToken))
+        {
+            rc = rtProcWinCreateEnvFromToken(hToken, hEnv, fFlags, &hEnvToUse);
+            CloseHandle(hToken);
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+    {
+        /*
+         * Apply hEnv as a change record on top of the default environment.
+         */
+        Assert(fFlags & RTPROC_FLAGS_ENV_CHANGE_RECORD);
+        rc = RTEnvClone(&hEnvToUse, RTENV_DEFAULT);
+        if (RT_SUCCESS(rc))
+        {
+            rc = RTEnvApplyChanges(hEnvToUse, hEnv);
+            if (RT_FAILURE(rc))
+                RTEnvDestroy(hEnvToUse);
+        }
+    }
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Query the UTF-16 environment block and locate the executable (if needed).
+         */
+        rc = RTEnvQueryUtf16Block(hEnvToUse, ppwszzBlock);
+        if (RT_SUCCESS(rc))
+            rc = rtProcWinFindExe(fFlags, hEnvToUse, pszExec, ppwszExec);
+
+        if (hEnvToUse != hEnv)
+            RTEnvDestroy(hEnvToUse);
+    }
+
+    return rc;
+}
+
+
+RTR3DECL(int)   RTProcCreateEx(const char *pszExec, const char * const *papszArgs, RTENV hEnv, uint32_t fFlags,
+                               PCRTHANDLE phStdIn, PCRTHANDLE phStdOut, PCRTHANDLE phStdErr, const char *pszAsUser,
+                               const char *pszPassword, void *pvExtraData, PRTPROCESS phProcess)
+{
+    /*
+     * Input validation
+     */
+    AssertPtrReturn(pszExec, VERR_INVALID_POINTER);
+    AssertReturn(*pszExec, VERR_INVALID_PARAMETER);
+    AssertReturn(!(fFlags & ~RTPROC_FLAGS_VALID_MASK), VERR_INVALID_PARAMETER);
+    AssertReturn(!(fFlags & RTPROC_FLAGS_DETACHED) || !phProcess, VERR_INVALID_PARAMETER);
+    AssertReturn(hEnv != NIL_RTENV, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(papszArgs, VERR_INVALID_PARAMETER);
+    AssertPtrNullReturn(pszAsUser, VERR_INVALID_POINTER);
+    AssertReturn(!pszAsUser || *pszAsUser, VERR_INVALID_PARAMETER);
+    AssertReturn(!pszPassword || pszAsUser, VERR_INVALID_PARAMETER);
+    AssertPtrNullReturn(pszPassword, VERR_INVALID_POINTER);
+
+    /* Extra data: */
+    uint32_t idDesiredSession = UINT32_MAX;
+    if (   (fFlags & (RTPROC_FLAGS_DESIRED_SESSION_ID | RTPROC_FLAGS_SERVICE))
+        ==           (RTPROC_FLAGS_DESIRED_SESSION_ID | RTPROC_FLAGS_SERVICE))
+    {
+        AssertPtrReturn(pvExtraData, VERR_INVALID_POINTER);
+        idDesiredSession = *(uint32_t *)pvExtraData;
+    }
+    else
+        AssertReturn(!(fFlags & RTPROC_FLAGS_DESIRED_SESSION_ID), VERR_INVALID_FLAGS);
+
+    /*
+     * Initialize the globals.
+     */
+    int rc = RTOnce(&g_rtProcWinInitOnce, rtProcWinInitOnce, NULL);
+    AssertRCReturn(rc, rc);
+    if (pszAsUser || (fFlags & (RTPROC_FLAGS_PROFILE | RTPROC_FLAGS_SERVICE | RTPROC_FLAGS_AS_IMPERSONATED_TOKEN)))
+    {
+        rc = RTOnce(&g_rtProcWinResolveOnce, rtProcWinResolveOnce, NULL);
+        AssertRCReturn(rc, rc);
+    }
+
+    /*
+     * Get the file descriptors for the handles we've been passed.
+     *
+     * It seems there is no point in trying to convince a child process's CRT
+     * that any of the standard file handles is non-TEXT.  So, we don't...
+     */
+    STARTUPINFOW StartupInfo;
+    RT_ZERO(StartupInfo);
+    StartupInfo.cb = sizeof(StartupInfo);
+    StartupInfo.dwFlags   = STARTF_USESTDHANDLES;
+#if 1 /* The CRT should keep the standard handles up to date. */
+    StartupInfo.hStdInput  = GetStdHandle(STD_INPUT_HANDLE);
+    StartupInfo.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
+    StartupInfo.hStdError  = GetStdHandle(STD_ERROR_HANDLE);
+#else
+    StartupInfo.hStdInput  = _get_osfhandle(0);
+    StartupInfo.hStdOutput = _get_osfhandle(1);
+    StartupInfo.hStdError  = _get_osfhandle(2);
+#endif
+    /* If we want to have a hidden process (e.g. not visible to
+     * to the user) use the STARTUPINFO flags. */
+    if (fFlags & RTPROC_FLAGS_HIDDEN)
+    {
+        StartupInfo.dwFlags |= STARTF_USESHOWWINDOW;
+        StartupInfo.wShowWindow = SW_HIDE;
+    }
+
+    PCRTHANDLE  paHandles[3] = { phStdIn,                   phStdOut,                   phStdErr };
+    HANDLE     *aphStds[3]   = { &StartupInfo.hStdInput,    &StartupInfo.hStdOutput,    &StartupInfo.hStdError };
+    DWORD       afInhStds[3] = { 0xffffffff,                0xffffffff,                 0xffffffff };
+    HANDLE      ahStdDups[3] = { INVALID_HANDLE_VALUE,      INVALID_HANDLE_VALUE,       INVALID_HANDLE_VALUE };
+    for (int i = 0; i < 3; i++)
+    {
+        if (paHandles[i])
+        {
+            AssertPtrReturn(paHandles[i], VERR_INVALID_POINTER);
+            switch (paHandles[i]->enmType)
+            {
+                case RTHANDLETYPE_FILE:
+                {
+                    HANDLE hNativeFile = paHandles[i]->u.hFile != NIL_RTFILE
+                                       ? (HANDLE)RTFileToNative(paHandles[i]->u.hFile)
+                                       : INVALID_HANDLE_VALUE;
+                    if (   hNativeFile == *aphStds[i]
+                        && g_enmWinVer == kRTWinOSType_NT310)
+                        continue;
+                    *aphStds[i] = hNativeFile;
+                    break;
+                }
+
+                case RTHANDLETYPE_PIPE:
+                    *aphStds[i] = paHandles[i]->u.hPipe != NIL_RTPIPE
+                                ? (HANDLE)RTPipeToNative(paHandles[i]->u.hPipe)
+                                : INVALID_HANDLE_VALUE;
+                    if (   g_enmWinVer == kRTWinOSType_NT310
+                        && *aphStds[i] == INVALID_HANDLE_VALUE)
+                    {
+                        AssertMsgReturn(RTPipeGetCreationInheritability(paHandles[i]->u.hPipe), ("%Rrc %p\n", rc, *aphStds[i]),
+                                        VERR_INVALID_STATE);
+                        continue;
+                    }
+                    break;
+
+                case RTHANDLETYPE_SOCKET:
+                    *aphStds[i] = paHandles[i]->u.hSocket != NIL_RTSOCKET
+                                ? (HANDLE)RTSocketToNative(paHandles[i]->u.hSocket)
+                                : INVALID_HANDLE_VALUE;
+                    break;
+
+                default:
+                    AssertMsgFailedReturn(("%d: %d\n", i, paHandles[i]->enmType), VERR_INVALID_PARAMETER);
+            }
+
+            /* Get the inheritability of the handle. */
+            if (*aphStds[i] != INVALID_HANDLE_VALUE)
+            {
+                if (g_enmWinVer == kRTWinOSType_NT310)
+                    afInhStds[i] = 0; /* No handle info on NT 3.1, so ASSUME it is not inheritable. */
+                else if (!GetHandleInformation(*aphStds[i], &afInhStds[i]))
+                {
+                    rc = RTErrConvertFromWin32(GetLastError());
+                    AssertMsgFailedReturn(("%Rrc aphStds[%d] => %p paHandles[%d]={%d,%p}\n",
+                                           rc, i, *aphStds[i], i, paHandles[i]->enmType, paHandles[i]->u.uInt),
+                                          rc);
+                }
+            }
+        }
+    }
+
+    /*
+     * Set the inheritability any handles we're handing the child.
+     *
+     * Note! On NT 3.1 there is no SetHandleInformation, so we have to duplicate
+     *       the handles to make sure they are inherited by the child.
+     */
+    rc = VINF_SUCCESS;
+    for (int i = 0; i < 3; i++)
+        if (   (afInhStds[i] != 0xffffffff)
+            && !(afInhStds[i] & HANDLE_FLAG_INHERIT))
+        {
+            if (g_enmWinVer == kRTWinOSType_NT310)
+            {
+                if (DuplicateHandle(GetCurrentProcess(), *aphStds[i], GetCurrentProcess(), &ahStdDups[i],
+                                    i == 0 ? GENERIC_READ : GENERIC_WRITE, TRUE /*fInheritHandle*/, DUPLICATE_SAME_ACCESS))
+                    *aphStds[i] = ahStdDups[i];
+                else
+                {
+                    rc = RTErrConvertFromWin32(GetLastError());
+                    AssertMsgFailedBreak(("%Rrc aphStds[%u] => %p\n", rc, i, *aphStds[i]));
+                }
+            }
+            else if (!SetHandleInformation(*aphStds[i], HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT))
+            {
+                rc = RTErrConvertFromWin32(GetLastError());
+                if (rc == VERR_INVALID_FUNCTION && g_enmWinVer == kRTWinOSType_NT310)
+                    rc = VINF_SUCCESS;
+                else
+                    AssertMsgFailedBreak(("%Rrc aphStds[%u] => %p\n", rc, i, *aphStds[i]));
+            }
+        }
+
+    /*
+     * Create the command line and convert the executable name.
+     */
+    PRTUTF16 pwszCmdLine = NULL; /* Shut up, MSC! */
+    if (RT_SUCCESS(rc))
+        rc = RTGetOptArgvToUtf16String(&pwszCmdLine, papszArgs,
+                                       !(fFlags & RTPROC_FLAGS_UNQUOTED_ARGS)
+                                       ? RTGETOPTARGV_CNV_QUOTE_MS_CRT : RTGETOPTARGV_CNV_UNQUOTED);
+    if (RT_SUCCESS(rc))
+    {
+        PRTUTF16 pwszExec;
+        rc = RTPathWinFromUtf8(&pwszExec, pszExec, 0 /*fFlags*/);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Get going...
+             */
+            PROCESS_INFORMATION ProcInfo;
+            RT_ZERO(ProcInfo);
+            DWORD dwCreationFlags = CREATE_UNICODE_ENVIRONMENT;
+            if (fFlags & RTPROC_FLAGS_DETACHED)
+                dwCreationFlags |= DETACHED_PROCESS;
+            if (fFlags & RTPROC_FLAGS_NO_WINDOW)
+                dwCreationFlags |= CREATE_NO_WINDOW;
+
+            /*
+             * Only use the normal CreateProcess stuff if we have no user name
+             * and we are not running from a (Windows) service. Otherwise use
+             * the more advanced version in rtProcWinCreateAsUser().
+             */
+            if (   pszAsUser == NULL
+                && !(fFlags & (RTPROC_FLAGS_SERVICE | RTPROC_FLAGS_AS_IMPERSONATED_TOKEN)))
+            {
+                /* Create the environment block first. */
+                PRTUTF16 pwszzBlock;
+                rc = rtProcWinCreateEnvBlockAndFindExe(fFlags, hEnv, pszExec, &pwszzBlock, &pwszExec);
+                if (RT_SUCCESS(rc))
+                {
+                    if (CreateProcessW(pwszExec,
+                                       pwszCmdLine,
+                                       NULL,         /* pProcessAttributes */
+                                       NULL,         /* pThreadAttributes */
+                                       TRUE,         /* fInheritHandles */
+                                       dwCreationFlags,
+                                       pwszzBlock,
+                                       NULL,         /* pCurrentDirectory */
+                                       &StartupInfo,
+                                       &ProcInfo))
+                        rc = VINF_SUCCESS;
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+                    RTEnvFreeUtf16Block(pwszzBlock);
+                }
+            }
+            else
+            {
+                /*
+                 * Convert the additional parameters and use a helper
+                 * function to do the actual work.
+                 */
+                PRTUTF16 pwszUser = NULL;
+                if (pszAsUser)
+                    rc = RTStrToUtf16(pszAsUser, &pwszUser);
+                if (RT_SUCCESS(rc))
+                {
+                    PRTUTF16 pwszPassword;
+                    rc = RTStrToUtf16(pszPassword ? pszPassword : "", &pwszPassword);
+                    if (RT_SUCCESS(rc))
+                    {
+                        rc = rtProcWinCreateAsUser(pwszUser, pwszPassword,
+                                                   &pwszExec, pwszCmdLine, hEnv, dwCreationFlags,
+                                                   &StartupInfo, &ProcInfo, fFlags, pszExec, idDesiredSession);
+
+                        if (pwszPassword && *pwszPassword)
+                            RTMemWipeThoroughly(pwszPassword, RTUtf16Len(pwszPassword), 5);
+                        RTUtf16Free(pwszPassword);
+                    }
+                    RTUtf16Free(pwszUser);
+                }
+            }
+            if (RT_SUCCESS(rc))
+            {
+                CloseHandle(ProcInfo.hThread);
+                if (phProcess)
+                {
+                    /*
+                     * Add the process to the child process list so RTProcWait can reuse and close
+                     * the process handle, unless, of course, the caller has no intention waiting.
+                     */
+                    if (!(fFlags & RTPROC_FLAGS_NO_WAIT))
+                        rtProcWinAddPid(ProcInfo.dwProcessId, ProcInfo.hProcess);
+                    else
+                        CloseHandle(ProcInfo.hProcess);
+                    *phProcess = ProcInfo.dwProcessId;
+                }
+                else
+                    CloseHandle(ProcInfo.hProcess);
+                rc = VINF_SUCCESS;
+            }
+            RTPathWinFree(pwszExec);
+        }
+        RTUtf16Free(pwszCmdLine);
+    }
+
+    if (g_enmWinVer != kRTWinOSType_NT310)
+    {
+        /* Undo any handle inherit changes. */
+        for (int i = 0; i < 3; i++)
+            if (   (afInhStds[i] != 0xffffffff)
+                && !(afInhStds[i] & HANDLE_FLAG_INHERIT))
+            {
+                if (   !SetHandleInformation(*aphStds[i], HANDLE_FLAG_INHERIT, 0)
+                    && (   GetLastError() != ERROR_INVALID_FUNCTION
+                        || g_enmWinVer != kRTWinOSType_NT310) )
+                    AssertMsgFailed(("%Rrc %p\n", RTErrConvertFromWin32(GetLastError()), *aphStds[i]));
+            }
+    }
+    else
+    {
+        /* Close handles duplicated for correct inheritance. */
+        for (int i = 0; i < 3; i++)
+            if (ahStdDups[i] != INVALID_HANDLE_VALUE)
+                CloseHandle(ahStdDups[i]);
+    }
+
+    return rc;
+}
+
+
+
+RTR3DECL(int) RTProcWait(RTPROCESS Process, unsigned fFlags, PRTPROCSTATUS pProcStatus)
+{
+    AssertReturn(!(fFlags & ~(RTPROCWAIT_FLAGS_BLOCK | RTPROCWAIT_FLAGS_NOBLOCK)), VERR_INVALID_PARAMETER);
+    int rc = RTOnce(&g_rtProcWinInitOnce, rtProcWinInitOnce, NULL);
+    AssertRCReturn(rc, rc);
+
+    /*
+     * Try find the process among the ones we've spawned, otherwise, attempt
+     * opening the specified process.
+     */
+    HANDLE hOpenedProc = NULL;
+    HANDLE hProcess = rtProcWinFindPid(Process);
+    if (hProcess == NULL)
+    {
+        hProcess = hOpenedProc = OpenProcess(PROCESS_QUERY_INFORMATION | SYNCHRONIZE, FALSE, Process);
+        if (hProcess == NULL)
+        {
+            DWORD dwErr = GetLastError();
+            if (dwErr == ERROR_INVALID_PARAMETER)
+                return VERR_PROCESS_NOT_FOUND;
+            return RTErrConvertFromWin32(dwErr);
+        }
+    }
+
+    /*
+     * Wait for it to terminate.
+     */
+    DWORD Millies = fFlags == RTPROCWAIT_FLAGS_BLOCK ? INFINITE : 0;
+    DWORD WaitRc = WaitForSingleObjectEx(hProcess, Millies, TRUE);
+    while (WaitRc == WAIT_IO_COMPLETION)
+        WaitRc = WaitForSingleObjectEx(hProcess, Millies, TRUE);
+    switch (WaitRc)
+    {
+        /*
+         * It has terminated.
+         */
+        case WAIT_OBJECT_0:
+        {
+            DWORD dwExitCode;
+            if (GetExitCodeProcess(hProcess, &dwExitCode))
+            {
+                /** @todo the exit code can be special statuses. */
+                if (pProcStatus)
+                {
+                    pProcStatus->enmReason = RTPROCEXITREASON_NORMAL;
+                    pProcStatus->iStatus = (int)dwExitCode;
+                }
+                if (hOpenedProc == NULL)
+                    rtProcWinRemovePid(Process);
+                rc = VINF_SUCCESS;
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+            break;
+        }
+
+        /*
+         * It hasn't terminated just yet.
+         */
+        case WAIT_TIMEOUT:
+            rc = VERR_PROCESS_RUNNING;
+            break;
+
+        /*
+         * Something went wrong...
+         */
+        case WAIT_FAILED:
+            rc = RTErrConvertFromWin32(GetLastError());
+            break;
+
+        case WAIT_ABANDONED:
+            AssertFailed();
+            rc = VERR_GENERAL_FAILURE;
+            break;
+
+        default:
+            AssertMsgFailed(("WaitRc=%RU32\n", WaitRc));
+            rc = VERR_GENERAL_FAILURE;
+            break;
+    }
+
+    if (hOpenedProc != NULL)
+        CloseHandle(hOpenedProc);
+    return rc;
+}
+
+
+RTR3DECL(int) RTProcWaitNoResume(RTPROCESS Process, unsigned fFlags, PRTPROCSTATUS pProcStatus)
+{
+    /** @todo this isn't quite right. */
+    return RTProcWait(Process, fFlags, pProcStatus);
+}
+
+
+RTR3DECL(int) RTProcTerminate(RTPROCESS Process)
+{
+    if (Process == NIL_RTPROCESS)
+        return VINF_SUCCESS;
+
+    int rc = RTOnce(&g_rtProcWinInitOnce, rtProcWinInitOnce, NULL);
+    AssertRCReturn(rc, rc);
+
+    /*
+     * Try find the process among the ones we've spawned, otherwise, attempt
+     * opening the specified process.
+     */
+    HANDLE hProcess = rtProcWinFindPid(Process);
+    if (hProcess != NULL)
+    {
+        if (!TerminateProcess(hProcess, 127))
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+    {
+        hProcess = OpenProcess(PROCESS_TERMINATE, FALSE, Process);
+        if (hProcess != NULL)
+        {
+            BOOL  fRc   = TerminateProcess(hProcess, 127);
+            DWORD dwErr = GetLastError();
+            CloseHandle(hProcess);
+            if (!fRc)
+                rc = RTErrConvertFromWin32(dwErr);
+        }
+    }
+    return rc;
+}
+
+
+RTR3DECL(uint64_t) RTProcGetAffinityMask(void)
+{
+    DWORD_PTR dwProcessAffinityMask = 0xffffffff;
+    DWORD_PTR dwSystemAffinityMask;
+
+    BOOL fRc = GetProcessAffinityMask(GetCurrentProcess(), &dwProcessAffinityMask, &dwSystemAffinityMask);
+    Assert(fRc); NOREF(fRc);
+
+    return dwProcessAffinityMask;
+}
+
+
+RTR3DECL(int) RTProcQueryUsername(RTPROCESS hProcess, char *pszUser, size_t cbUser, size_t *pcbUser)
+{
+    AssertReturn(   (pszUser && cbUser > 0)
+                 || (!pszUser && !cbUser), VERR_INVALID_PARAMETER);
+    AssertReturn(pcbUser || pszUser, VERR_INVALID_PARAMETER);
+
+    int rc;
+    if (   hProcess == NIL_RTPROCESS
+        || hProcess == RTProcSelf())
+    {
+        RTUTF16 wszUsername[UNLEN + 1];
+        DWORD   cwcUsername = RT_ELEMENTS(wszUsername);
+        if (GetUserNameW(&wszUsername[0], &cwcUsername))
+        {
+            if (pszUser)
+            {
+                rc = RTUtf16ToUtf8Ex(wszUsername, cwcUsername, &pszUser, cbUser, pcbUser);
+                if (pcbUser)
+                    *pcbUser += 1;
+            }
+            else
+            {
+                *pcbUser = RTUtf16CalcUtf8Len(wszUsername) + 1;
+                rc = VERR_BUFFER_OVERFLOW;
+            }
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+        rc = VERR_NOT_SUPPORTED;
+    return rc;
+}
+
+
+RTR3DECL(int) RTProcQueryUsernameA(RTPROCESS hProcess, char **ppszUser)
+{
+    AssertPtrReturn(ppszUser, VERR_INVALID_POINTER);
+    int rc;
+    if (   hProcess == NIL_RTPROCESS
+        || hProcess == RTProcSelf())
+    {
+        RTUTF16 wszUsername[UNLEN + 1];
+        DWORD   cwcUsername = RT_ELEMENTS(wszUsername);
+        if (GetUserNameW(&wszUsername[0], &cwcUsername))
+            rc = RTUtf16ToUtf8(wszUsername, ppszUser);
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    else
+        rc = VERR_NOT_SUPPORTED;
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/rtProcInitExePath-win.cpp b/src/VBox/Runtime/r3/win/rtProcInitExePath-win.cpp
new file mode 100644
index 00000000..810a9eb2
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/rtProcInitExePath-win.cpp
@@ -0,0 +1,62 @@
+/* $Id: rtProcInitExePath-win.cpp $ */
+/** @file
+ * IPRT - rtProcInitName, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_PROCESS
+#include <iprt/win/windows.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/path.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+#include "internal/process.h"
+
+
+DECLHIDDEN(int) rtProcInitExePath(char *pszPath, size_t cchPath)
+{
+    /*
+     * Query the image name from the dynamic linker, convert and return it.
+     */
+    WCHAR  wsz[RTPATH_MAX];
+    HMODULE hExe = GetModuleHandle(NULL);
+    if (GetModuleFileNameW(hExe, wsz, RTPATH_MAX))
+    {
+        int rc = RTUtf16ToUtf8Ex(wsz, RTSTR_MAX, &pszPath, cchPath, NULL);
+        AssertRCReturn(rc, rc);
+        return VINF_SUCCESS;
+    }
+
+    DWORD err = GetLastError();
+    int rc = RTErrConvertFromWin32(err);
+    AssertMsgFailed(("%Rrc %d\n", rc, err));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/sched-win.cpp b/src/VBox/Runtime/r3/win/sched-win.cpp
new file mode 100644
index 00000000..4b62499f
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/sched-win.cpp
@@ -0,0 +1,344 @@
+/* $Id: sched-win.cpp $ */
+/** @file
+ * IPRT - Scheduling, Win32.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+/** @def WIN32_SCHED_ENABLED
+ * Enables the priority scheme. */
+#define WIN32_SCHED_ENABLED
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_THREAD
+#include <iprt/win/windows.h>
+
+#include <iprt/thread.h>
+#include <iprt/log.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include "internal/sched.h"
+#include "internal/thread.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Configuration of one priority.
+ */
+typedef struct
+{
+    /** The priority. */
+    RTPROCPRIORITY  enmPriority;
+    /** The name of this priority. */
+    const char     *pszName;
+    /** The Win32 process priority class. If ANY_PROCESS_PRIORITY_CLASS the
+     * process priority class is left unchanged. */
+    DWORD dwProcessPriorityClass;
+    /** Array scheduler attributes corresponding to each of the thread types. */
+    struct
+    {
+        /** For sanity include the array index. */
+        RTTHREADTYPE    enmType;
+        /** The Win32 thread priority. */
+        int             iThreadPriority;
+    } aTypes[RTTHREADTYPE_END];
+} PROCPRIORITY;
+
+/** Matches any process priority class. */
+#define ANY_PROCESS_PRIORITY_CLASS  (~0U)
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * Array of static priority configurations.
+ */
+static const PROCPRIORITY g_aPriorities[] =
+{
+    {
+        RTPROCPRIORITY_FLAT, "Flat", ANY_PROCESS_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_NORMAL }
+        }
+    },
+    {
+        RTPROCPRIORITY_LOW, "Low - Below Normal", BELOW_NORMAL_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_HIGHEST },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+        }
+    },
+    {
+        RTPROCPRIORITY_LOW, "Low", ANY_PROCESS_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_NORMAL }
+        }
+    },
+    {
+        RTPROCPRIORITY_NORMAL, "Normal - Normal", NORMAL_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+        }
+    },
+    {
+        RTPROCPRIORITY_NORMAL, "Normal", ANY_PROCESS_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+        }
+    },
+    {
+        RTPROCPRIORITY_HIGH, "High - High", HIGH_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_HIGHEST },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+        }
+    },
+    {
+        RTPROCPRIORITY_HIGH, "High - Above Normal", ABOVE_NORMAL_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_LOWEST },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_HIGHEST },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+        }
+    },
+    {
+        RTPROCPRIORITY_HIGH, "High", ANY_PROCESS_PRIORITY_CLASS,
+        {
+            { RTTHREADTYPE_INVALID,                 ~0 },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_BELOW_NORMAL },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_NORMAL },
+            { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_ABOVE_NORMAL },
+            { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_HIGHEST },
+            { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_HIGHEST },
+            { RTTHREADTYPE_IO,                      THREAD_PRIORITY_HIGHEST },
+            { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+        }
+    }
+};
+
+/**
+ * The dynamic default priority configuration.
+ *
+ * This can be recalulated at runtime depending on what the
+ * system allow us to do. Presently we don't do this as it's
+ * generally not a bit issue on Win32 hosts.
+ */
+static PROCPRIORITY g_aDefaultPriority =
+{
+    RTPROCPRIORITY_LOW, "Default", ANY_PROCESS_PRIORITY_CLASS,
+    {
+        { RTTHREADTYPE_INVALID,                 ~0 },
+        { RTTHREADTYPE_INFREQUENT_POLLER,       THREAD_PRIORITY_LOWEST },
+        { RTTHREADTYPE_MAIN_HEAVY_WORKER,       THREAD_PRIORITY_BELOW_NORMAL },
+        { RTTHREADTYPE_EMULATION,               THREAD_PRIORITY_NORMAL },
+        { RTTHREADTYPE_DEFAULT,                 THREAD_PRIORITY_NORMAL },
+        { RTTHREADTYPE_GUI,                     THREAD_PRIORITY_NORMAL },
+        { RTTHREADTYPE_MAIN_WORKER,             THREAD_PRIORITY_NORMAL },
+        { RTTHREADTYPE_VRDP_IO,                 THREAD_PRIORITY_NORMAL },
+        { RTTHREADTYPE_DEBUGGER,                THREAD_PRIORITY_ABOVE_NORMAL },
+        { RTTHREADTYPE_MSG_PUMP,                THREAD_PRIORITY_ABOVE_NORMAL },
+        { RTTHREADTYPE_IO,                      THREAD_PRIORITY_HIGHEST },
+        { RTTHREADTYPE_TIMER,                   THREAD_PRIORITY_HIGHEST }
+    }
+};
+
+
+/** Pointer to the current priority configuration. */
+static const PROCPRIORITY *g_pProcessPriority = &g_aDefaultPriority;
+
+
+/**
+ * Calculate the scheduling properties for all the threads in the default
+ * process priority, assuming the current thread have the type enmType.
+ *
+ * @returns iprt status code.
+ * @param   enmType     The thread type to be assumed for the current thread.
+ */
+DECLHIDDEN(int) rtSchedNativeCalcDefaultPriority(RTTHREADTYPE enmType)
+{
+    Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END); RT_NOREF_PV(enmType);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Validates and sets the process priority.
+ * This will check that all rtThreadNativeSetPriority() will success for all the
+ * thread types when applied to the current thread.
+ *
+ * @returns iprt status code.
+ * @param   enmPriority     The priority to validate and set.
+ * @remark  Located in sched.
+ */
+DECLHIDDEN(int) rtProcNativeSetPriority(RTPROCPRIORITY enmPriority)
+{
+    Assert(enmPriority > RTPROCPRIORITY_INVALID && enmPriority < RTPROCPRIORITY_LAST); RT_NOREF_PV(enmPriority);
+
+    if (enmPriority == RTPROCPRIORITY_DEFAULT)
+    {
+        g_pProcessPriority = &g_aDefaultPriority;
+        return VINF_SUCCESS;
+    }
+
+    for (size_t i = 0; i < RT_ELEMENTS(g_aPriorities); i++)
+        if (   g_aPriorities[i].enmPriority == enmPriority
+            && g_aPriorities[i].dwProcessPriorityClass == ANY_PROCESS_PRIORITY_CLASS)
+        {
+            g_pProcessPriority = &g_aPriorities[i];
+            return VINF_SUCCESS;
+        }
+
+    AssertFailedReturn(VERR_INTERNAL_ERROR);
+}
+
+
+/**
+ * Gets the win32 thread handle.
+ *
+ * @returns Valid win32 handle for the specified thread.
+ * @param   pThread     The thread.
+ */
+DECLINLINE(HANDLE) rtThreadNativeGetHandle(PRTTHREADINT pThread)
+{
+    if ((uintptr_t)pThread->Core.Key == GetCurrentThreadId())
+        return GetCurrentThread();
+    return (HANDLE)pThread->hThread;
+}
+
+
+/**
+ * Sets the priority of the thread according to the thread type
+ * and current process priority.
+ *
+ * The RTTHREADINT::enmType member has not yet been updated and will be updated by
+ * the caller on a successful return.
+ *
+ * @returns iprt status code.
+ * @param   pThread     The thread in question.
+ * @param   enmType     The thread type.
+ * @remark  Located in sched.
+ */
+DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
+{
+    Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
+    AssertMsg(g_pProcessPriority && g_pProcessPriority->aTypes[enmType].enmType == enmType,
+              ("enmType=%d entry=%d\n", enmType, g_pProcessPriority->aTypes[enmType].enmType));
+
+#ifdef WIN32_SCHED_ENABLED
+    HANDLE hThread = rtThreadNativeGetHandle(pThread);
+    if (   hThread == NULL /* No handle for alien threads. */
+        || SetThreadPriority(hThread, g_pProcessPriority->aTypes[enmType].iThreadPriority))
+        return VINF_SUCCESS;
+
+    DWORD dwLastError = GetLastError();
+    int rc = RTErrConvertFromWin32(dwLastError);
+    AssertMsgFailed(("SetThreadPriority(%p, %d) failed, dwLastError=%d rc=%Rrc\n",
+                     rtThreadNativeGetHandle(pThread), g_pProcessPriority->aTypes[enmType].iThreadPriority, dwLastError, rc));
+    return rc;
+#else
+    return VINF_SUCCESS;
+#endif
+}
+
diff --git a/src/VBox/Runtime/r3/win/semevent-win.cpp b/src/VBox/Runtime/r3/win/semevent-win.cpp
new file mode 100644
index 00000000..c6258939
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/semevent-win.cpp
@@ -0,0 +1,305 @@
+/* $Id: semevent-win.cpp $ */
+/** @file
+ * IPRT - Event Semaphore, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SEMAPHORE
+#include <iprt/win/windows.h>
+
+#include <iprt/semaphore.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/lockvalidator.h>
+#include <iprt/mem.h>
+#include <iprt/thread.h>
+#include "internal/magics.h"
+#include "internal/mem.h"
+#include "internal/strict.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+struct RTSEMEVENTINTERNAL
+{
+    /** Magic value (RTSEMEVENT_MAGIC). */
+    uint32_t            u32Magic;
+    /** The event handle. */
+    HANDLE              hev;
+#ifdef RTSEMEVENT_STRICT
+    /** Signallers. */
+    RTLOCKVALRECSHRD    Signallers;
+    /** Indicates that lock validation should be performed. */
+    bool volatile       fEverHadSignallers;
+#endif
+    /** The creation flags. */
+    uint32_t            fFlags;
+};
+
+
+
+RTDECL(int)  RTSemEventCreate(PRTSEMEVENT phEventSem)
+{
+    return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
+}
+
+
+RTDECL(int)  RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
+{
+    AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
+    Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
+
+    struct RTSEMEVENTINTERNAL *pThis;
+    if (!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK))
+        pThis = (struct RTSEMEVENTINTERNAL *)RTMemAlloc(sizeof(*pThis));
+    else
+        pThis = (struct RTSEMEVENTINTERNAL *)rtMemBaseAlloc(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    /*
+     * Create the semaphore.
+     * (Auto reset, not signaled, private event object.)
+     */
+    pThis->hev = CreateEvent(NULL, FALSE, FALSE, NULL);
+    if (pThis->hev != NULL) /* not INVALID_HANDLE_VALUE */
+    {
+        pThis->u32Magic = RTSEMEVENT_MAGIC;
+        pThis->fFlags   = fFlags;
+#ifdef RTSEMEVENT_STRICT
+        if (!pszNameFmt)
+        {
+            static uint32_t volatile s_iSemEventAnon = 0;
+            RTLockValidatorRecSharedInit(&pThis->Signallers, hClass, RTLOCKVAL_SUB_CLASS_ANY, pThis,
+                                         true /*fSignaller*/, !(fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL),
+                                         "RTSemEvent-%u", ASMAtomicIncU32(&s_iSemEventAnon) - 1);
+        }
+        else
+        {
+            va_list va;
+            va_start(va, pszNameFmt);
+            RTLockValidatorRecSharedInitV(&pThis->Signallers, hClass, RTLOCKVAL_SUB_CLASS_ANY, pThis,
+                                          true /*fSignaller*/, !(fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL),
+                                          pszNameFmt, va);
+            va_end(va);
+        }
+        pThis->fEverHadSignallers = false;
+#else
+        RT_NOREF_PV(hClass); RT_NOREF_PV(pszNameFmt);
+#endif
+
+        *phEventSem = pThis;
+        return VINF_SUCCESS;
+    }
+
+    DWORD dwErr = GetLastError();
+    if (!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK))
+        RTMemFree(pThis);
+    else
+        rtMemBaseFree(pThis);
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTDECL(int)  RTSemEventDestroy(RTSEMEVENT hEventSem)
+{
+    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
+    if (pThis == NIL_RTSEMEVENT)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Invalidate the handle and close the semaphore.
+     */
+    int rc = VINF_SUCCESS;
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC, RTSEMEVENT_MAGIC), VERR_INVALID_HANDLE);
+    if (CloseHandle(pThis->hev))
+    {
+#ifdef RTSEMEVENT_STRICT
+        RTLockValidatorRecSharedDelete(&pThis->Signallers);
+#endif
+        if (!(pThis->fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK))
+            RTMemFree(pThis);
+        else
+            rtMemBaseFree(pThis);
+    }
+    else
+    {
+        DWORD dwErr = GetLastError();
+        rc = RTErrConvertFromWin32(dwErr);
+        AssertMsgFailed(("Destroy hEventSem %p failed, lasterr=%u (%Rrc)\n", pThis, dwErr, rc));
+        /* Leak it. */
+    }
+
+    return rc;
+}
+
+
+RTDECL(int)  RTSemEventSignal(RTSEMEVENT hEventSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
+
+#ifdef RTSEMEVENT_STRICT
+    if (pThis->fEverHadSignallers)
+    {
+        int rc9 = RTLockValidatorRecSharedCheckSignaller(&pThis->Signallers, NIL_RTTHREAD);
+        if (RT_FAILURE(rc9))
+            return rc9;
+    }
+#endif
+
+    /*
+     * Signal the object.
+     */
+    if (SetEvent(pThis->hev))
+        return VINF_SUCCESS;
+    DWORD dwErr = GetLastError();
+    AssertMsgFailed(("Signaling hEventSem %p failed, lasterr=%d\n", pThis, dwErr));
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+/** Goto avoidance. */
+DECL_FORCE_INLINE(int) rtSemEventWaitHandleStatus(struct RTSEMEVENTINTERNAL *pThis, DWORD rc)
+{
+    switch (rc)
+    {
+        case WAIT_OBJECT_0:         return VINF_SUCCESS;
+        case WAIT_TIMEOUT:          return VERR_TIMEOUT;
+        case WAIT_IO_COMPLETION:    return VERR_INTERRUPTED;
+        case WAIT_ABANDONED:        return VERR_SEM_OWNER_DIED;
+        default:
+            AssertMsgFailed(("%u\n", rc));
+        case WAIT_FAILED:
+        {
+            int rc2 = RTErrConvertFromWin32(GetLastError());
+            AssertMsgFailed(("Wait on hEventSem %p failed, rc=%d lasterr=%d\n", pThis, rc, GetLastError()));
+            if (rc2)
+                return rc2;
+
+            AssertMsgFailed(("WaitForSingleObject(event) -> rc=%d while converted lasterr=%d\n", rc, rc2));
+            RT_NOREF_PV(pThis);
+            return VERR_INTERNAL_ERROR;
+        }
+    }
+}
+
+
+#undef RTSemEventWaitNoResume
+RTDECL(int)   RTSemEventWaitNoResume(RTSEMEVENT hEventSem, RTMSINTERVAL cMillies)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Wait for condition.
+     */
+#ifdef RTSEMEVENT_STRICT
+    RTTHREAD hThreadSelf = !(pThis->fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)
+                         ? RTThreadSelfAutoAdopt()
+                         : RTThreadSelf();
+    if (pThis->fEverHadSignallers)
+    {
+        DWORD rc = WaitForSingleObjectEx(pThis->hev,
+                                         0 /*Timeout*/,
+                                         TRUE /*fAlertable*/);
+        if (rc != WAIT_TIMEOUT || cMillies == 0)
+            return rtSemEventWaitHandleStatus(pThis, rc);
+        int rc9 = RTLockValidatorRecSharedCheckBlocking(&pThis->Signallers, hThreadSelf, NULL /*pSrcPos*/, false,
+                                                        cMillies, RTTHREADSTATE_EVENT, true);
+        if (RT_FAILURE(rc9))
+            return rc9;
+    }
+#else
+    RTTHREAD hThreadSelf = RTThreadSelf();
+#endif
+    RTThreadBlocking(hThreadSelf, RTTHREADSTATE_EVENT, true);
+    DWORD rc = WaitForSingleObjectEx(pThis->hev,
+                                     cMillies == RT_INDEFINITE_WAIT ? INFINITE : cMillies,
+                                     TRUE /*fAlertable*/);
+    RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_EVENT);
+    return rtSemEventWaitHandleStatus(pThis, rc);
+}
+
+
+RTDECL(void) RTSemEventSetSignaller(RTSEMEVENT hEventSem, RTTHREAD hThread)
+{
+#ifdef RTSEMEVENT_STRICT
+    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
+    AssertPtrReturnVoid(pThis);
+    AssertReturnVoid(pThis->u32Magic == RTSEMEVENT_MAGIC);
+
+    ASMAtomicWriteBool(&pThis->fEverHadSignallers, true);
+    RTLockValidatorRecSharedResetOwner(&pThis->Signallers, hThread, NULL);
+#else
+    RT_NOREF_PV(hEventSem); RT_NOREF_PV(hThread);
+#endif
+}
+
+
+RTDECL(void) RTSemEventAddSignaller(RTSEMEVENT hEventSem, RTTHREAD hThread)
+{
+#ifdef RTSEMEVENT_STRICT
+    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
+    AssertPtrReturnVoid(pThis);
+    AssertReturnVoid(pThis->u32Magic == RTSEMEVENT_MAGIC);
+
+    ASMAtomicWriteBool(&pThis->fEverHadSignallers, true);
+    RTLockValidatorRecSharedAddOwner(&pThis->Signallers, hThread, NULL);
+#else
+    RT_NOREF_PV(hEventSem); RT_NOREF_PV(hThread);
+#endif
+}
+
+
+RTDECL(void) RTSemEventRemoveSignaller(RTSEMEVENT hEventSem, RTTHREAD hThread)
+{
+#ifdef RTSEMEVENT_STRICT
+    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
+    AssertPtrReturnVoid(pThis);
+    AssertReturnVoid(pThis->u32Magic == RTSEMEVENT_MAGIC);
+
+    RTLockValidatorRecSharedRemoveOwner(&pThis->Signallers, hThread);
+#else
+    RT_NOREF_PV(hEventSem); RT_NOREF_PV(hThread);
+#endif
+}
+
diff --git a/src/VBox/Runtime/r3/win/semeventmulti-win.cpp b/src/VBox/Runtime/r3/win/semeventmulti-win.cpp
new file mode 100644
index 00000000..670cb810
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/semeventmulti-win.cpp
@@ -0,0 +1,379 @@
+/* $Id: semeventmulti-win.cpp $ */
+/** @file
+ * IPRT - Multiple Release Event Semaphore, Windows.
+ *
+ * @remarks This file is identical to semevent-win.cpp except for the 2nd
+ *          CreateEvent parameter, the reset function and the "Multi" infix.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SEMAPHORE
+#include <iprt/win/windows.h>
+
+#include <iprt/semaphore.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/lockvalidator.h>
+#include <iprt/mem.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+#include "internal/magics.h"
+#include "internal/strict.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+struct RTSEMEVENTMULTIINTERNAL
+{
+    /** Magic value (RTSEMEVENTMULTI_MAGIC). */
+    uint32_t            u32Magic;
+    /** The event handle. */
+    HANDLE              hev;
+#ifdef RTSEMEVENT_STRICT
+    /** Signallers. */
+    RTLOCKVALRECSHRD    Signallers;
+    /** Indicates that lock validation should be performed. */
+    bool volatile       fEverHadSignallers;
+#endif
+};
+
+
+
+RTDECL(int)  RTSemEventMultiCreate(PRTSEMEVENTMULTI phEventMultiSem)
+{
+    return RTSemEventMultiCreateEx(phEventMultiSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
+}
+
+
+RTDECL(int)  RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
+                                     const char *pszNameFmt, ...)
+{
+    AssertReturn(!(fFlags & ~RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
+
+    struct RTSEMEVENTMULTIINTERNAL *pThis = (struct RTSEMEVENTMULTIINTERNAL *)RTMemAlloc(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    /*
+     * Create the semaphore.
+     * (Manual reset, not signaled, private event object.)
+     */
+    pThis->hev = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (pThis->hev != NULL) /* not INVALID_HANDLE_VALUE */
+    {
+        pThis->u32Magic = RTSEMEVENTMULTI_MAGIC;
+#ifdef RTSEMEVENT_STRICT
+        if (!pszNameFmt)
+        {
+            static uint32_t volatile s_iSemEventMultiAnon = 0;
+            RTLockValidatorRecSharedInit(&pThis->Signallers, hClass, RTLOCKVAL_SUB_CLASS_ANY, pThis,
+                                         true /*fSignaller*/, !(fFlags & RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL),
+                                         "RTSemEventMulti-%u", ASMAtomicIncU32(&s_iSemEventMultiAnon) - 1);
+        }
+        else
+        {
+            va_list va;
+            va_start(va, pszNameFmt);
+            RTLockValidatorRecSharedInitV(&pThis->Signallers, hClass, RTLOCKVAL_SUB_CLASS_ANY, pThis,
+                                          true /*fSignaller*/, !(fFlags & RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL),
+                                          pszNameFmt, va);
+            va_end(va);
+        }
+        pThis->fEverHadSignallers = false;
+#else
+        RT_NOREF_PV(hClass); RT_NOREF_PV(pszNameFmt);
+#endif
+
+        *phEventMultiSem = pThis;
+        return VINF_SUCCESS;
+    }
+
+    DWORD dwErr = GetLastError();
+    RTMemFree(pThis);
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTDECL(int)  RTSemEventMultiDestroy(RTSEMEVENTMULTI hEventMultiSem)
+{
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    if (pThis == NIL_RTSEMEVENT)        /* don't bitch */
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Invalidate the handle and close the semaphore.
+     */
+    int rc = VINF_SUCCESS;
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTSEMEVENTMULTI_MAGIC, RTSEMEVENTMULTI_MAGIC), VERR_INVALID_HANDLE);
+    if (CloseHandle(pThis->hev))
+    {
+#ifdef RTSEMEVENT_STRICT
+        RTLockValidatorRecSharedDelete(&pThis->Signallers);
+#endif
+        RTMemFree(pThis);
+    }
+    else
+    {
+        DWORD dwErr = GetLastError();
+        rc = RTErrConvertFromWin32(dwErr);
+        AssertMsgFailed(("Destroy hEventMultiSem %p failed, lasterr=%u (%Rrc)\n", pThis, dwErr, rc));
+        /* Leak it. */
+    }
+
+    return rc;
+}
+
+
+RTDECL(int)  RTSemEventMultiSignal(RTSEMEVENTMULTI hEventMultiSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, VERR_INVALID_HANDLE);
+
+#ifdef RTSEMEVENT_STRICT
+    if (pThis->fEverHadSignallers)
+    {
+        int rc9 = RTLockValidatorRecSharedCheckSignaller(&pThis->Signallers, NIL_RTTHREAD);
+        if (RT_FAILURE(rc9))
+            return rc9;
+    }
+#endif
+
+    /*
+     * Signal the object.
+     */
+    if (SetEvent(pThis->hev))
+        return VINF_SUCCESS;
+    DWORD dwErr = GetLastError();
+    AssertMsgFailed(("Signaling hEventMultiSem %p failed, lasterr=%d\n", pThis, dwErr));
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTDECL(int)  RTSemEventMultiReset(RTSEMEVENTMULTI hEventMultiSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Reset the object.
+     */
+    if (ResetEvent(pThis->hev))
+        return VINF_SUCCESS;
+    DWORD dwErr = GetLastError();
+    AssertMsgFailed(("Resetting hEventMultiSem %p failed, lasterr=%d\n", pThis, dwErr));
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+/** Goto avoidance. */
+DECL_FORCE_INLINE(int)
+rtSemEventWaitHandleStatus(struct RTSEMEVENTMULTIINTERNAL *pThis, uint32_t fFlags, DWORD rc)
+{
+    switch (rc)
+    {
+        case WAIT_OBJECT_0:         return VINF_SUCCESS;
+        case WAIT_TIMEOUT:          return VERR_TIMEOUT;
+        case WAIT_IO_COMPLETION:    return fFlags & RTSEMWAIT_FLAGS_RESUME ? VERR_TIMEOUT : VERR_INTERRUPTED;
+        case WAIT_ABANDONED:        return VERR_SEM_OWNER_DIED;
+        default:
+            AssertMsgFailed(("%u\n", rc));
+        case WAIT_FAILED:
+        {
+            int rc2 = RTErrConvertFromWin32(GetLastError());
+            AssertMsgFailed(("Wait on hEventMultiSem %p failed, rc=%d lasterr=%d\n", pThis, rc, GetLastError()));
+            if (rc2)
+                return rc2;
+
+            AssertMsgFailed(("WaitForSingleObject(event) -> rc=%d while converted lasterr=%d\n", rc, rc2));
+            RT_NOREF_PV(pThis);
+            return VERR_INTERNAL_ERROR;
+        }
+    }
+}
+
+
+DECLINLINE(int) rtSemEventMultiWinWait(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
+                                       PCRTLOCKVALSRCPOS pSrcPos)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
+
+    /*
+     * Convert the timeout to a millisecond count.
+     */
+    uint64_t uAbsDeadline;
+    DWORD    dwMsTimeout;
+    if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
+    {
+        dwMsTimeout  = INFINITE;
+        uAbsDeadline = UINT64_MAX;
+    }
+    else
+    {
+        if (fFlags & RTSEMWAIT_FLAGS_NANOSECS)
+            uTimeout = uTimeout < UINT64_MAX - UINT32_C(1000000) / 2
+                     ? (uTimeout + UINT32_C(1000000) / 2) / UINT32_C(1000000)
+                     : UINT64_MAX / UINT32_C(1000000);
+        if (fFlags & RTSEMWAIT_FLAGS_ABSOLUTE)
+        {
+            uAbsDeadline = uTimeout;
+            uint64_t u64Now = RTTimeSystemMilliTS();
+            if (u64Now < uTimeout)
+                uTimeout -= u64Now;
+            else
+                uTimeout = 0;
+        }
+        else if (fFlags & RTSEMWAIT_FLAGS_RESUME)
+            uAbsDeadline = RTTimeSystemMilliTS() + uTimeout;
+        else
+            uAbsDeadline = UINT64_MAX;
+
+        dwMsTimeout = uTimeout < UINT32_MAX
+                    ? (DWORD)uTimeout
+                    : INFINITE;
+    }
+
+    /*
+     * Do the wait.
+     */
+    DWORD rc;
+#ifdef RTSEMEVENT_STRICT
+    RTTHREAD hThreadSelf = RTThreadSelfAutoAdopt();
+    if (pThis->fEverHadSignallers)
+    {
+        do
+            rc = WaitForSingleObjectEx(pThis->hev, 0 /*Timeout*/, TRUE /*fAlertable*/);
+        while (rc == WAIT_IO_COMPLETION && (fFlags & RTSEMWAIT_FLAGS_RESUME));
+        if (rc != WAIT_TIMEOUT || dwMsTimeout == 0)
+            return rtSemEventWaitHandleStatus(pThis, fFlags, rc);
+        int rc9 = RTLockValidatorRecSharedCheckBlocking(&pThis->Signallers, hThreadSelf, pSrcPos, false,
+                                                        dwMsTimeout, RTTHREADSTATE_EVENT_MULTI, true);
+        if (RT_FAILURE(rc9))
+            return rc9;
+    }
+#else
+    RTTHREAD hThreadSelf = RTThreadSelf();
+    RT_NOREF_PV(pSrcPos);
+#endif
+    RTThreadBlocking(hThreadSelf, RTTHREADSTATE_EVENT_MULTI, true);
+    rc = WaitForSingleObjectEx(pThis->hev, dwMsTimeout, TRUE /*fAlertable*/);
+    if (rc == WAIT_IO_COMPLETION && (fFlags & RTSEMWAIT_FLAGS_RESUME))
+    {
+        while (   rc == WAIT_IO_COMPLETION
+               && RTTimeSystemMilliTS() < uAbsDeadline)
+            rc = WaitForSingleObjectEx(pThis->hev, dwMsTimeout, TRUE /*fAlertable*/);
+
+    }
+    RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_EVENT_MULTI);
+    return rtSemEventWaitHandleStatus(pThis, fFlags, rc);
+}
+
+
+
+#undef RTSemEventMultiWaitEx
+RTDECL(int)  RTSemEventMultiWaitEx(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout)
+{
+#ifndef RTSEMEVENT_STRICT
+    return rtSemEventMultiWinWait(hEventMultiSem, fFlags, uTimeout, NULL);
+#else
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
+    return rtSemEventMultiWinWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
+#endif
+}
+
+
+RTDECL(int)  RTSemEventMultiWaitExDebug(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
+                                        RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
+    return rtSemEventMultiWinWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
+}
+
+
+
+RTDECL(void) RTSemEventMultiSetSignaller(RTSEMEVENTMULTI hEventMultiSem, RTTHREAD hThread)
+{
+#ifdef RTSEMEVENT_STRICT
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    AssertPtrReturnVoid(pThis);
+    AssertReturnVoid(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC);
+
+    ASMAtomicWriteBool(&pThis->fEverHadSignallers, true);
+    RTLockValidatorRecSharedResetOwner(&pThis->Signallers, hThread, NULL);
+#else
+    RT_NOREF_PV(hEventMultiSem); RT_NOREF_PV(hThread);
+#endif
+}
+
+
+RTDECL(void) RTSemEventMultiAddSignaller(RTSEMEVENTMULTI hEventMultiSem, RTTHREAD hThread)
+{
+#ifdef RTSEMEVENT_STRICT
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    AssertPtrReturnVoid(pThis);
+    AssertReturnVoid(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC);
+
+    ASMAtomicWriteBool(&pThis->fEverHadSignallers, true);
+    RTLockValidatorRecSharedAddOwner(&pThis->Signallers, hThread, NULL);
+#else
+    RT_NOREF_PV(hEventMultiSem); RT_NOREF_PV(hThread);
+#endif
+}
+
+
+RTDECL(void) RTSemEventMultiRemoveSignaller(RTSEMEVENTMULTI hEventMultiSem, RTTHREAD hThread)
+{
+#ifdef RTSEMEVENT_STRICT
+    struct RTSEMEVENTMULTIINTERNAL *pThis = hEventMultiSem;
+    AssertPtrReturnVoid(pThis);
+    AssertReturnVoid(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC);
+
+    RTLockValidatorRecSharedRemoveOwner(&pThis->Signallers, hThread);
+#else
+    RT_NOREF_PV(hEventMultiSem); RT_NOREF_PV(hThread);
+#endif
+}
+
diff --git a/src/VBox/Runtime/r3/win/semmutex-win.cpp b/src/VBox/Runtime/r3/win/semmutex-win.cpp
new file mode 100644
index 00000000..a1bd5f55
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/semmutex-win.cpp
@@ -0,0 +1,346 @@
+/* $Id: semmutex-win.cpp $ */
+/** @file
+ * IPRT - Mutex Semaphores, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SEMAPHORE
+#include <iprt/win/windows.h>
+
+#include <iprt/semaphore.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/lockvalidator.h>
+#include <iprt/mem.h>
+#include <iprt/thread.h>
+#include "internal/magics.h"
+#include "internal/strict.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Posix internal representation of a Mutex semaphore. */
+struct RTSEMMUTEXINTERNAL
+{
+    /** Magic value (RTSEMMUTEX_MAGIC). */
+    uint32_t                u32Magic;
+    /** Recursion count. */
+    uint32_t volatile       cRecursions;
+    /** The owner thread. */
+    RTNATIVETHREAD volatile hNativeOwner;
+    /** The mutex handle. */
+    HANDLE                  hMtx;
+#ifdef RTSEMMUTEX_STRICT
+    /** Lock validator record associated with this mutex. */
+    RTLOCKVALRECEXCL        ValidatorRec;
+#endif
+};
+
+
+
+#undef RTSemMutexCreate
+RTDECL(int)  RTSemMutexCreate(PRTSEMMUTEX phMutexSem)
+{
+    return RTSemMutexCreateEx(phMutexSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_NONE, NULL);
+}
+
+
+RTDECL(int) RTSemMutexCreateEx(PRTSEMMUTEX phMutexSem, uint32_t fFlags,
+                               RTLOCKVALCLASS hClass, uint32_t uSubClass, const char *pszNameFmt, ...)
+{
+    AssertReturn(!(fFlags & ~RTSEMMUTEX_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
+
+    /*
+     * Create the semaphore.
+     */
+    int rc;
+    HANDLE hMtx = CreateMutex(NULL, FALSE, NULL);
+    if (hMtx)
+    {
+        RTSEMMUTEXINTERNAL *pThis = (RTSEMMUTEXINTERNAL *)RTMemAlloc(sizeof(*pThis));
+        if (pThis)
+        {
+            pThis->u32Magic     = RTSEMMUTEX_MAGIC;
+            pThis->hMtx         = hMtx;
+            pThis->hNativeOwner = NIL_RTNATIVETHREAD;
+            pThis->cRecursions  = 0;
+#ifdef RTSEMMUTEX_STRICT
+            if (!pszNameFmt)
+            {
+                static uint32_t volatile s_iMutexAnon = 0;
+                RTLockValidatorRecExclInit(&pThis->ValidatorRec, hClass, uSubClass, pThis,
+                                           !(fFlags & RTSEMMUTEX_FLAGS_NO_LOCK_VAL),
+                                           "RTSemMutex-%u", ASMAtomicIncU32(&s_iMutexAnon) - 1);
+            }
+            else
+            {
+                va_list va;
+                va_start(va, pszNameFmt);
+                RTLockValidatorRecExclInitV(&pThis->ValidatorRec, hClass, uSubClass, pThis,
+                                            !(fFlags & RTSEMMUTEX_FLAGS_NO_LOCK_VAL), pszNameFmt, va);
+                va_end(va);
+            }
+#else
+            RT_NOREF_PV(hClass); RT_NOREF_PV(uSubClass); RT_NOREF_PV(pszNameFmt);
+#endif
+            *phMutexSem = pThis;
+            return VINF_SUCCESS;
+        }
+
+        rc = VERR_NO_MEMORY;
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+    return rc;
+}
+
+
+RTDECL(int)  RTSemMutexDestroy(RTSEMMUTEX hMutexSem)
+{
+    /*
+     * Validate.
+     */
+    RTSEMMUTEXINTERNAL *pThis = hMutexSem;
+    if (pThis == NIL_RTSEMMUTEX)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Close semaphore handle.
+     */
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSEMMUTEX_MAGIC_DEAD, RTSEMMUTEX_MAGIC), VERR_INVALID_HANDLE);
+    HANDLE hMtx = pThis->hMtx;
+    ASMAtomicWritePtr(&pThis->hMtx, INVALID_HANDLE_VALUE);
+
+    int rc = VINF_SUCCESS;
+    if (!CloseHandle(hMtx))
+    {
+        rc = RTErrConvertFromWin32(GetLastError());
+        AssertMsgFailed(("%p rc=%d lasterr=%d\n", pThis->hMtx, rc, GetLastError()));
+    }
+
+#ifdef RTSEMMUTEX_STRICT
+    RTLockValidatorRecExclDelete(&pThis->ValidatorRec);
+#endif
+    RTMemFree(pThis);
+    return rc;
+}
+
+
+RTDECL(uint32_t) RTSemMutexSetSubClass(RTSEMMUTEX hMutexSem, uint32_t uSubClass)
+{
+#ifdef RTSEMMUTEX_STRICT
+    /*
+     * Validate.
+     */
+    RTSEMMUTEXINTERNAL *pThis = hMutexSem;
+    AssertPtrReturn(pThis, RTLOCKVAL_SUB_CLASS_INVALID);
+    AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, RTLOCKVAL_SUB_CLASS_INVALID);
+
+    return RTLockValidatorRecExclSetSubClass(&pThis->ValidatorRec, uSubClass);
+#else
+    RT_NOREF_PV(hMutexSem); RT_NOREF_PV(uSubClass);
+    return RTLOCKVAL_SUB_CLASS_INVALID;
+#endif
+}
+
+
+/**
+ * Internal worker for RTSemMutexRequestNoResume and it's debug companion.
+ *
+ * @returns Same as RTSEmMutexRequestNoResume
+ * @param   hMutexSem            The mutex handle.
+ * @param   cMillies            The number of milliseconds to wait.
+ * @param   pSrcPos             The source position of the caller.
+ */
+DECL_FORCE_INLINE(int) rtSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, PCRTLOCKVALSRCPOS pSrcPos)
+{
+    /*
+     * Validate.
+     */
+    RTSEMMUTEXINTERNAL *pThis = hMutexSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Check for recursive entry.
+     */
+    RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf();
+    RTNATIVETHREAD hNativeOwner;
+    ASMAtomicReadHandle(&pThis->hNativeOwner, &hNativeOwner);
+    if (hNativeOwner == hNativeSelf)
+    {
+#ifdef RTSEMMUTEX_STRICT
+        int rc9 = RTLockValidatorRecExclRecursion(&pThis->ValidatorRec, pSrcPos);
+        if (RT_FAILURE(rc9))
+            return rc9;
+#endif
+        ASMAtomicIncU32(&pThis->cRecursions);
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Lock mutex semaphore.
+     */
+    RTTHREAD        hThreadSelf = NIL_RTTHREAD;
+    if (cMillies > 0)
+    {
+#ifdef RTSEMMUTEX_STRICT
+        hThreadSelf = RTThreadSelfAutoAdopt();
+        int rc9 = RTLockValidatorRecExclCheckOrderAndBlocking(&pThis->ValidatorRec, hThreadSelf, pSrcPos, true,
+                                                              cMillies, RTTHREADSTATE_MUTEX, true);
+        if (RT_FAILURE(rc9))
+            return rc9;
+#else
+        hThreadSelf = RTThreadSelf();
+        RTThreadBlocking(hThreadSelf, RTTHREADSTATE_MUTEX, true);
+        RT_NOREF_PV(pSrcPos);
+#endif
+    }
+    DWORD rc = WaitForSingleObjectEx(pThis->hMtx,
+                                     cMillies == RT_INDEFINITE_WAIT ? INFINITE : cMillies,
+                                     TRUE /*fAlertable*/);
+    RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_MUTEX);
+    switch (rc)
+    {
+        case WAIT_OBJECT_0:
+#ifdef RTSEMMUTEX_STRICT
+            RTLockValidatorRecExclSetOwner(&pThis->ValidatorRec, hThreadSelf, pSrcPos, true);
+#endif
+            ASMAtomicWriteHandle(&pThis->hNativeOwner, hNativeSelf);
+            ASMAtomicWriteU32(&pThis->cRecursions, 1);
+            return VINF_SUCCESS;
+
+        case WAIT_TIMEOUT:          return VERR_TIMEOUT;
+        case WAIT_IO_COMPLETION:    return VERR_INTERRUPTED;
+        case WAIT_ABANDONED:        return VERR_SEM_OWNER_DIED;
+        default:
+            AssertMsgFailed(("%u\n",  rc));
+        case WAIT_FAILED:
+        {
+            int rc2 = RTErrConvertFromWin32(GetLastError());
+            AssertMsgFailed(("Wait on hMutexSem %p failed, rc=%d lasterr=%d\n", hMutexSem, rc, GetLastError()));
+            if (rc2 != VINF_SUCCESS)
+                return rc2;
+
+            AssertMsgFailed(("WaitForSingleObject(event) -> rc=%d while converted lasterr=%d\n", rc, rc2));
+            return VERR_INTERNAL_ERROR;
+        }
+    }
+}
+
+
+#undef RTSemMutexRequestNoResume
+RTDECL(int) RTSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
+{
+#ifndef RTSEMMUTEX_STRICT
+    return rtSemMutexRequestNoResume(hMutexSem, cMillies, NULL);
+#else
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
+    return rtSemMutexRequestNoResume(hMutexSem, cMillies, &SrcPos);
+#endif
+}
+
+
+RTDECL(int) RTSemMutexRequestNoResumeDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
+    return rtSemMutexRequestNoResume(hMutexSem, cMillies, &SrcPos);
+}
+
+
+RTDECL(int) RTSemMutexRelease(RTSEMMUTEX hMutexSem)
+{
+    /*
+     * Validate.
+     */
+    RTSEMMUTEXINTERNAL *pThis = hMutexSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Check ownership and recursions.
+     */
+    RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf();
+    RTNATIVETHREAD hNativeOwner;
+    ASMAtomicReadHandle(&pThis->hNativeOwner, &hNativeOwner);
+    if (RT_UNLIKELY(hNativeOwner != hNativeSelf))
+    {
+        AssertMsgFailed(("Not owner of mutex %p!! hNativeSelf=%RTntrd Owner=%RTntrd cRecursions=%d\n",
+                         pThis, hNativeSelf, hNativeOwner, pThis->cRecursions));
+        return VERR_NOT_OWNER;
+    }
+    if (pThis->cRecursions > 1)
+    {
+#ifdef RTSEMMUTEX_STRICT
+        int rc9 = RTLockValidatorRecExclUnwind(&pThis->ValidatorRec);
+        if (RT_FAILURE(rc9))
+            return rc9;
+#endif
+        ASMAtomicDecU32(&pThis->cRecursions);
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Unlock mutex semaphore.
+     */
+#ifdef RTSEMMUTEX_STRICT
+    int rc9 = RTLockValidatorRecExclReleaseOwner(&pThis->ValidatorRec, false);
+    if (RT_FAILURE(rc9))
+        return rc9;
+#endif
+    ASMAtomicWriteU32(&pThis->cRecursions, 0);
+    ASMAtomicWriteHandle(&pThis->hNativeOwner, NIL_RTNATIVETHREAD);
+
+    if (ReleaseMutex(pThis->hMtx))
+        return VINF_SUCCESS;
+
+    int rc = RTErrConvertFromWin32(GetLastError());
+    AssertMsgFailed(("%p/%p, rc=%Rrc lasterr=%d\n", pThis, pThis->hMtx, rc, GetLastError()));
+    return rc;
+}
+
+
+RTDECL(bool) RTSemMutexIsOwned(RTSEMMUTEX hMutexSem)
+{
+    /*
+     * Validate.
+     */
+    RTSEMMUTEXINTERNAL *pThis = hMutexSem;
+    AssertPtrReturn(pThis, false);
+    AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, false);
+
+    RTNATIVETHREAD hNativeOwner;
+    ASMAtomicReadHandle(&pThis->hNativeOwner, &hNativeOwner);
+    return hNativeOwner != NIL_RTNATIVETHREAD;
+}
+
diff --git a/src/VBox/Runtime/r3/win/serialport-win.cpp b/src/VBox/Runtime/r3/win/serialport-win.cpp
new file mode 100644
index 00000000..0a9bb53c
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/serialport-win.cpp
@@ -0,0 +1,1046 @@
+/* $Id: serialport-win.cpp $ */
+/** @file
+ * IPRT - Serial Port API, Windows Implementation.
+ */
+
+/*
+ * Copyright (C) 2017-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/serialport.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/cdefs.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+#include "internal/magics.h"
+
+#include <iprt/win/windows.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+
+/**
+ * Internal serial port state.
+ */
+typedef struct RTSERIALPORTINTERNAL
+{
+    /** Magic value (RTSERIALPORT_MAGIC). */
+    uint32_t            u32Magic;
+    /** Flags given while opening the serial port. */
+    uint32_t            fOpenFlags;
+    /** The device handle. */
+    HANDLE              hDev;
+    /** The overlapped write structure. */
+    OVERLAPPED          OverlappedWrite;
+    /** The overlapped read structure. */
+    OVERLAPPED          OverlappedRead;
+    /** The overlapped I/O structure when waiting on events. */
+    OVERLAPPED          OverlappedEvt;
+    /** The event handle to wait on for the overlapped event operations of the device. */
+    HANDLE              hEvtDev;
+    /** The event handle to wait on for the overlapped write operations of the device. */
+    HANDLE              hEvtWrite;
+    /** The event handle to wait on for the overlapped read operations of the device. */
+    HANDLE              hEvtRead;
+    /** The event handle to wait on for waking up waiting threads externally. */
+    HANDLE              hEvtIntr;
+    /** Events currently waited for. */
+    uint32_t            fEvtMask;
+    /** Event mask as received by WaitCommEvent(). */
+    DWORD               dwEventMask;
+    /** Flag whether a write is currently pending. */
+    bool                fWritePending;
+    /** Event query pending. */
+    bool                fEvtQueryPending;
+    /** Bounce buffer for writes. */
+    uint8_t            *pbBounceBuf;
+    /** Amount of used buffer space. */
+    size_t              cbBounceBufUsed;
+    /** Amount of allocated buffer space. */
+    size_t              cbBounceBufAlloc;
+    /** The current active port config. */
+    DCB                 PortCfg;
+} RTSERIALPORTINTERNAL;
+/** Pointer to the internal serial port state. */
+typedef RTSERIALPORTINTERNAL *PRTSERIALPORTINTERNAL;
+
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The pipe buffer size we prefer. */
+#define RTSERIALPORT_NT_SIZE      _32K
+
+
+
+/*********************************************************************************************************************************
+*   Global variables                                                                                                             *
+*********************************************************************************************************************************/
+
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+
+/**
+ * Updatest the current event mask to wait for.
+ *
+ * @returns IPRT status code.
+ * @param   pThis                   The internal serial port instance data.
+ * @param   fEvtMask                The new event mask to change to.
+ */
+static int rtSerialPortWinUpdateEvtMask(PRTSERIALPORTINTERNAL pThis, uint32_t fEvtMask)
+{
+    DWORD dwEvtMask = EV_ERR;
+
+    if (fEvtMask & RTSERIALPORT_EVT_F_DATA_RX)
+        dwEvtMask |= EV_RXCHAR;
+    if (fEvtMask & RTSERIALPORT_EVT_F_DATA_TX)
+        dwEvtMask |= EV_TXEMPTY;
+    if (fEvtMask & RTSERIALPORT_EVT_F_BREAK_DETECTED)
+        dwEvtMask |= EV_BREAK;
+    if (fEvtMask & RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED)
+        dwEvtMask |= EV_CTS | EV_DSR | EV_RING | EV_RLSD;
+
+    int rc = VINF_SUCCESS;
+    if (!SetCommMask(pThis->hDev, dwEvtMask))
+        rc = RTErrConvertFromWin32(GetLastError());
+    else
+        pThis->fEvtMask = fEvtMask;
+
+    return rc;
+}
+
+
+/**
+ * Tries to set the default config on the given serial port.
+ *
+ * @returns IPRT status code.
+ * @param   pThis                   The internal serial port instance data.
+ */
+static int rtSerialPortSetDefaultCfg(PRTSERIALPORTINTERNAL pThis)
+{
+    if (!PurgeComm(pThis->hDev, PURGE_RXABORT | PURGE_RXCLEAR | PURGE_TXABORT | PURGE_TXCLEAR))
+        return RTErrConvertFromWin32(GetLastError());
+
+    pThis->PortCfg.DCBlength = sizeof(pThis->PortCfg);
+    if (!GetCommState(pThis->hDev, &pThis->PortCfg))
+        return RTErrConvertFromWin32(GetLastError());
+
+    pThis->PortCfg.BaudRate          = CBR_9600;
+    pThis->PortCfg.fBinary           = TRUE;
+    pThis->PortCfg.fParity           = TRUE;
+    pThis->PortCfg.fDtrControl       = DTR_CONTROL_DISABLE;
+    pThis->PortCfg.ByteSize          = 8;
+    pThis->PortCfg.Parity            = NOPARITY;
+    pThis->PortCfg.fOutxCtsFlow      = FALSE;
+    pThis->PortCfg.fOutxDsrFlow      = FALSE;
+    pThis->PortCfg.fDsrSensitivity   = FALSE;
+    pThis->PortCfg.fTXContinueOnXoff = TRUE;
+    pThis->PortCfg.fOutX             = FALSE;
+    pThis->PortCfg.fInX              = FALSE;
+    pThis->PortCfg.fErrorChar        = FALSE;
+    pThis->PortCfg.fNull             = FALSE;
+    pThis->PortCfg.fRtsControl       = RTS_CONTROL_DISABLE;
+    pThis->PortCfg.fAbortOnError     = FALSE;
+    pThis->PortCfg.wReserved         = 0;
+    pThis->PortCfg.XonLim            = 5;
+    pThis->PortCfg.XoffLim           = 5;
+
+    int rc = VINF_SUCCESS;
+    if (!SetCommState(pThis->hDev, &pThis->PortCfg))
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Set timeouts for non blocking mode.
+         * See https://docs.microsoft.com/en-us/windows/desktop/api/winbase/ns-winbase-_commtimeouts .
+         */
+        COMMTIMEOUTS ComTimeouts;
+        RT_ZERO(ComTimeouts);
+        ComTimeouts.ReadIntervalTimeout = MAXDWORD;
+        if (!SetCommTimeouts(pThis->hDev, &ComTimeouts))
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+
+    return rc;
+}
+
+
+/**
+ * Common worker for handling I/O completion.
+ *
+ * This is used by RTSerialPortClose, RTSerialPortWrite and RTPipeSerialPortNB.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The pipe instance handle.
+ */
+static int rtSerialPortWriteCheckCompletion(PRTSERIALPORTINTERNAL pThis)
+{
+    int rc = VINF_SUCCESS;
+    DWORD dwRc = WaitForSingleObject(pThis->OverlappedWrite.hEvent, 0);
+    if (dwRc == WAIT_OBJECT_0)
+    {
+        DWORD cbWritten = 0;
+        if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedWrite, &cbWritten, TRUE))
+        {
+            for (;;)
+            {
+                if (cbWritten >= pThis->cbBounceBufUsed)
+                {
+                    pThis->fWritePending = false;
+                    rc = VINF_SUCCESS;
+                    break;
+                }
+
+                /* resubmit the remainder of the buffer - can this actually happen? */
+                memmove(&pThis->pbBounceBuf[0], &pThis->pbBounceBuf[cbWritten], pThis->cbBounceBufUsed - cbWritten);
+                rc = ResetEvent(pThis->OverlappedWrite.hEvent); Assert(rc == TRUE);
+                if (!WriteFile(pThis->hDev, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed,
+                               &cbWritten, &pThis->OverlappedWrite))
+                {
+                    if (GetLastError() == ERROR_IO_PENDING)
+                        rc = VINF_TRY_AGAIN;
+                    else
+                    {
+                        pThis->fWritePending = false;
+                        rc = RTErrConvertFromWin32(GetLastError());
+                    }
+                    break;
+                }
+                Assert(cbWritten > 0);
+            }
+        }
+        else
+        {
+            pThis->fWritePending = false;
+            rc = RTErrConvertFromWin32(GetLastError());
+        }
+    }
+    else if (dwRc == WAIT_TIMEOUT)
+        rc = VINF_TRY_AGAIN;
+    else
+    {
+        pThis->fWritePending = false;
+        if (dwRc == WAIT_ABANDONED)
+            rc = VERR_INVALID_HANDLE;
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+    }
+    return rc;
+}
+
+
+/**
+ * Processes the received Windows comm events and converts them to our format.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The pipe instance handle.
+ * @param   dwEventMask         Event mask received.
+ * @param   pfEvtsRecv          Where to store the converted events.
+ */
+static int rtSerialPortEvtFlagsProcess(PRTSERIALPORTINTERNAL pThis, DWORD dwEventMask, uint32_t *pfEvtsRecv)
+{
+    int rc = VINF_SUCCESS;
+
+    if (dwEventMask & EV_RXCHAR)
+        *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_RX;
+    if (dwEventMask & EV_TXEMPTY)
+    {
+        if (pThis->fWritePending)
+        {
+            rc = rtSerialPortWriteCheckCompletion(pThis);
+            if (rc == VINF_SUCCESS)
+                *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_TX;
+            else
+                rc = VINF_SUCCESS;
+        }
+        else
+            *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_TX;
+    }
+    if (dwEventMask & EV_BREAK)
+        *pfEvtsRecv |= RTSERIALPORT_EVT_F_BREAK_DETECTED;
+    if (dwEventMask & (EV_CTS | EV_DSR | EV_RING | EV_RLSD))
+        *pfEvtsRecv |= RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED;
+
+    return rc;
+}
+
+
+/**
+ * The internal comm event wait worker.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The pipe instance handle.
+ * @param   msTimeout           The timeout to wait for.
+ */
+static int rtSerialPortEvtWaitWorker(PRTSERIALPORTINTERNAL pThis, RTMSINTERVAL msTimeout)
+{
+    int rc = VINF_SUCCESS;
+    HANDLE ahWait[2];
+    ahWait[0] = pThis->hEvtDev;
+    ahWait[1] = pThis->hEvtIntr;
+
+    DWORD dwRet = WaitForMultipleObjects(2, ahWait, FALSE, msTimeout == RT_INDEFINITE_WAIT ? INFINITE : msTimeout);
+    if (dwRet == WAIT_TIMEOUT)
+        rc = VERR_TIMEOUT;
+    else if (dwRet == WAIT_FAILED)
+        rc = RTErrConvertFromWin32(GetLastError());
+    else if (dwRet == WAIT_OBJECT_0)
+        rc = VINF_SUCCESS;
+    else
+    {
+        Assert(dwRet == WAIT_OBJECT_0 + 1);
+        rc = VERR_INTERRUPTED;
+    }
+
+    return rc;
+}
+
+
+RTDECL(int)  RTSerialPortOpen(PRTSERIALPORT phSerialPort, const char *pszPortAddress, uint32_t fFlags)
+{
+    AssertPtrReturn(phSerialPort, VERR_INVALID_POINTER);
+    AssertReturn(VALID_PTR(pszPortAddress) && *pszPortAddress != '\0', VERR_INVALID_PARAMETER);
+    AssertReturn(!(fFlags & ~RTSERIALPORT_OPEN_F_VALID_MASK), VERR_INVALID_PARAMETER);
+    AssertReturn((fFlags & RTSERIALPORT_OPEN_F_READ) || (fFlags & RTSERIALPORT_OPEN_F_WRITE),
+                 VERR_INVALID_PARAMETER);
+
+    int rc = VINF_SUCCESS;
+    PRTSERIALPORTINTERNAL pThis = (PRTSERIALPORTINTERNAL)RTMemAllocZ(sizeof(*pThis));
+    if (pThis)
+    {
+        pThis->u32Magic         = RTSERIALPORT_MAGIC;
+        pThis->fOpenFlags       = fFlags;
+        pThis->fEvtMask         = 0;
+        pThis->fWritePending    = false;
+        pThis->fEvtQueryPending = false;
+        pThis->pbBounceBuf      = NULL;
+        pThis->cbBounceBufUsed  = 0;
+        pThis->cbBounceBufAlloc = 0;
+        RT_ZERO(pThis->OverlappedEvt);
+        RT_ZERO(pThis->OverlappedWrite);
+        RT_ZERO(pThis->OverlappedRead);
+        pThis->hEvtDev          = CreateEvent(NULL, TRUE, FALSE, NULL);
+        if (pThis->hEvtDev)
+        {
+            pThis->OverlappedEvt.hEvent = pThis->hEvtDev,
+            pThis->hEvtIntr = CreateEvent(NULL, FALSE, FALSE, NULL);
+            if (pThis->hEvtIntr)
+            {
+                pThis->hEvtWrite = CreateEvent(NULL, TRUE, TRUE, NULL);
+                if (pThis->hEvtWrite)
+                {
+                    pThis->OverlappedWrite.hEvent = pThis->hEvtWrite;
+                    pThis->hEvtRead = CreateEvent(NULL, TRUE, TRUE, NULL);
+                    if (pThis->hEvtRead)
+                    {
+                        pThis->OverlappedRead.hEvent = pThis->hEvtRead;
+                        DWORD fWinFlags = 0;
+
+                        if (fFlags & RTSERIALPORT_OPEN_F_WRITE)
+                            fWinFlags |= GENERIC_WRITE;
+                        if (fFlags & RTSERIALPORT_OPEN_F_READ)
+                            fWinFlags |= GENERIC_READ;
+
+                        pThis->hDev = CreateFile(pszPortAddress,
+                                                 fWinFlags,
+                                                 0, /* Must be opened with exclusive access. */
+                                                 NULL, /* No SECURITY_ATTRIBUTES structure. */
+                                                 OPEN_EXISTING, /* Must use OPEN_EXISTING. */
+                                                 FILE_FLAG_OVERLAPPED, /* Overlapped I/O. */
+                                                 NULL);
+                        if (pThis->hDev)
+                        {
+                            rc = rtSerialPortSetDefaultCfg(pThis);
+                            if (RT_SUCCESS(rc))
+                            {
+                                *phSerialPort = pThis;
+                                return rc;
+                            }
+                        }
+                        else
+                            rc = RTErrConvertFromWin32(GetLastError());
+
+                        CloseHandle(pThis->hEvtRead);
+                    }
+
+                    CloseHandle(pThis->hEvtWrite);
+                }
+
+                CloseHandle(pThis->hEvtIntr);
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+
+            CloseHandle(pThis->hEvtDev);
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+
+        RTMemFree(pThis);
+    }
+    else
+        rc = VERR_NO_MEMORY;
+
+    return rc;
+}
+
+
+RTDECL(int)  RTSerialPortClose(RTSERIALPORT hSerialPort)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    if (pThis == NIL_RTSERIALPORT)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+
+    /*
+     * Do the cleanup.
+     */
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSERIALPORT_MAGIC_DEAD, RTSERIALPORT_MAGIC), VERR_INVALID_HANDLE);
+
+    if (pThis->fWritePending)
+        rtSerialPortWriteCheckCompletion(pThis);
+
+    CloseHandle(pThis->hDev);
+    CloseHandle(pThis->hEvtDev);
+    CloseHandle(pThis->hEvtWrite);
+    CloseHandle(pThis->hEvtRead);
+    CloseHandle(pThis->hEvtIntr);
+    pThis->hDev      = NULL;
+    pThis->hEvtDev   = NULL;
+    pThis->hEvtWrite = NULL;
+    pThis->hEvtRead  = NULL;
+    pThis->hEvtIntr  = NULL;
+    RTMemFree(pThis);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(RTHCINTPTR) RTSerialPortToNative(RTSERIALPORT hSerialPort)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, -1);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, -1);
+
+    return (RTHCINTPTR)pThis->hDev;
+}
+
+
+RTDECL(int) RTSerialPortRead(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER);
+
+    /*
+     * Kick of an overlapped read.
+     */
+    int rc = VINF_SUCCESS;
+    uint8_t *pbBuf = (uint8_t *)pvBuf;
+
+    while (   cbToRead > 0
+           && RT_SUCCESS(rc))
+    {
+        BOOL fSucc = ResetEvent(pThis->OverlappedRead.hEvent); Assert(fSucc == TRUE); RT_NOREF(fSucc);
+        DWORD cbRead = 0;
+        if (ReadFile(pThis->hDev, pbBuf,
+                     cbToRead <= ~(DWORD)0 ? (DWORD)cbToRead : ~(DWORD)0,
+                     &cbRead, &pThis->OverlappedRead))
+        {
+            if (pcbRead)
+            {
+                *pcbRead = cbRead;
+                break;
+            }
+            rc = VINF_SUCCESS;
+        }
+        else if (GetLastError() == ERROR_IO_PENDING)
+        {
+            DWORD dwWait = WaitForSingleObject(pThis->OverlappedRead.hEvent, INFINITE);
+            if (dwWait == WAIT_OBJECT_0)
+            {
+                if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedRead, &cbRead, TRUE /*fWait*/))
+                {
+                    if (pcbRead)
+                    {
+                        *pcbRead = cbRead;
+                        break;
+                    }
+                    rc = VINF_SUCCESS;
+                }
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            else
+            {
+                Assert(dwWait == WAIT_FAILED);
+                rc = RTErrConvertFromWin32(GetLastError());
+            }
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+
+        if (RT_SUCCESS(rc))
+        {
+            cbToRead -= cbRead;
+            pbBuf    += cbRead;
+        }
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortReadNB(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pcbRead, VERR_INVALID_POINTER);
+
+    *pcbRead = 0;
+
+    /* Check whether there is data waiting in the input queue. */
+    int rc = VINF_SUCCESS;
+    COMSTAT ComStat; RT_ZERO(ComStat);
+    if (ClearCommError(pThis->hDev, NULL, &ComStat))
+    {
+        if (ComStat.cbInQue > 0)
+        {
+            DWORD dwToRead = RT_MIN(ComStat.cbInQue, (DWORD)cbToRead);
+            /* Kick of an overlapped read.  It should return immediately */
+            BOOL fSucc = ResetEvent(pThis->OverlappedRead.hEvent); Assert(fSucc == TRUE); RT_NOREF(fSucc);
+            DWORD cbRead = 0;
+            if (   cbToRead == 0
+                || ReadFile(pThis->hDev, pvBuf, dwToRead,
+                            &cbRead, &pThis->OverlappedRead))
+                *pcbRead = cbRead;
+            else if (GetLastError() == ERROR_IO_PENDING)
+            {
+                /* This shouldn't actually happen, so turn this into a synchronous read. */
+                if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedRead, &cbRead, TRUE /*fWait*/))
+                    *pcbRead = cbRead;
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+        }
+        else
+            rc = VINF_TRY_AGAIN;
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortWrite(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER);
+
+    /* If I/O is pending, check if it has completed. */
+    int rc = VINF_SUCCESS;
+    if (pThis->fWritePending)
+        rc = rtSerialPortWriteCheckCompletion(pThis);
+    if (rc == VINF_SUCCESS)
+    {
+        const uint8_t *pbBuf = (const uint8_t *)pvBuf;
+
+        while (   cbToWrite > 0
+               && RT_SUCCESS(rc))
+        {
+            BOOL fSucc = ResetEvent(pThis->OverlappedWrite.hEvent); Assert(fSucc == TRUE); RT_NOREF(fSucc);
+            DWORD cbWritten = 0;
+            if (WriteFile(pThis->hDev, pbBuf,
+                          cbToWrite <= ~(DWORD)0 ? (DWORD)cbToWrite : ~(DWORD)0,
+                          &cbWritten, &pThis->OverlappedWrite))
+            {
+                if (pcbWritten)
+                {
+                    *pcbWritten = cbWritten;
+                    break;
+                }
+                rc = VINF_SUCCESS;
+            }
+            else if (GetLastError() == ERROR_IO_PENDING)
+            {
+                DWORD dwWait = WaitForSingleObject(pThis->OverlappedWrite.hEvent, INFINITE);
+                if (dwWait == WAIT_OBJECT_0)
+                {
+                    if (GetOverlappedResult(pThis->hDev, &pThis->OverlappedWrite, &cbWritten, TRUE /*fWait*/))
+                    {
+                        if (pcbWritten)
+                        {
+                            *pcbWritten = cbWritten;
+                            break;
+                        }
+                        rc = VINF_SUCCESS;
+                    }
+                    else
+                        rc = RTErrConvertFromWin32(GetLastError());
+                }
+                else
+                {
+                    Assert(dwWait == WAIT_FAILED);
+                    rc = RTErrConvertFromWin32(GetLastError());
+                }
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+
+            if (RT_SUCCESS(rc))
+            {
+                cbToWrite -= cbWritten;
+                pbBuf     += cbWritten;
+            }
+        }
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortWriteNB(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pcbWritten, VERR_INVALID_POINTER);
+
+    /* If I/O is pending, check if it has completed. */
+    int rc = VINF_SUCCESS;
+    if (pThis->fWritePending)
+        rc = rtSerialPortWriteCheckCompletion(pThis);
+    if (rc == VINF_SUCCESS)
+    {
+        Assert(!pThis->fWritePending);
+
+        /* Do the bounce buffering. */
+        if (    pThis->cbBounceBufAlloc < cbToWrite
+            &&  pThis->cbBounceBufAlloc < RTSERIALPORT_NT_SIZE)
+        {
+            if (cbToWrite > RTSERIALPORT_NT_SIZE)
+                cbToWrite = RTSERIALPORT_NT_SIZE;
+            void *pv = RTMemRealloc(pThis->pbBounceBuf, RT_ALIGN_Z(cbToWrite, _1K));
+            if (pv)
+            {
+                pThis->pbBounceBuf = (uint8_t *)pv;
+                pThis->cbBounceBufAlloc = RT_ALIGN_Z(cbToWrite, _1K);
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+        else if (cbToWrite > RTSERIALPORT_NT_SIZE)
+            cbToWrite = RTSERIALPORT_NT_SIZE;
+        if (RT_SUCCESS(rc) && cbToWrite)
+        {
+            memcpy(pThis->pbBounceBuf, pvBuf, cbToWrite);
+            pThis->cbBounceBufUsed = (uint32_t)cbToWrite;
+
+            /* Submit the write. */
+            rc = ResetEvent(pThis->OverlappedWrite.hEvent); Assert(rc == TRUE);
+            DWORD cbWritten = 0;
+            if (WriteFile(pThis->hDev, pThis->pbBounceBuf, (DWORD)pThis->cbBounceBufUsed,
+                          &cbWritten, &pThis->OverlappedWrite))
+            {
+                *pcbWritten = RT_MIN(cbWritten, cbToWrite); /* paranoia^3 */
+                rc = VINF_SUCCESS;
+            }
+            else if (GetLastError() == ERROR_IO_PENDING)
+            {
+                *pcbWritten = cbToWrite;
+                pThis->fWritePending = true;
+                rc = VINF_SUCCESS;
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+        }
+        else if (RT_SUCCESS(rc))
+            *pcbWritten = 0;
+    }
+    else if (RT_SUCCESS(rc))
+        *pcbWritten = 0;
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortCfgQueryCurrent(RTSERIALPORT hSerialPort, PRTSERIALPORTCFG pCfg)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+
+    pCfg->uBaudRate = pThis->PortCfg.BaudRate;
+    switch (pThis->PortCfg.Parity)
+    {
+        case NOPARITY:
+            pCfg->enmParity = RTSERIALPORTPARITY_NONE;
+            break;
+        case EVENPARITY:
+            pCfg->enmParity = RTSERIALPORTPARITY_EVEN;
+            break;
+        case ODDPARITY:
+            pCfg->enmParity = RTSERIALPORTPARITY_ODD;
+            break;
+        case MARKPARITY:
+            pCfg->enmParity = RTSERIALPORTPARITY_MARK;
+            break;
+        case SPACEPARITY:
+            pCfg->enmParity = RTSERIALPORTPARITY_SPACE;
+            break;
+        default:
+            AssertFailed();
+            return VERR_INTERNAL_ERROR;
+    }
+
+    switch (pThis->PortCfg.ByteSize)
+    {
+        case 5:
+            pCfg->enmDataBitCount = RTSERIALPORTDATABITS_5BITS;
+            break;
+        case 6:
+            pCfg->enmDataBitCount = RTSERIALPORTDATABITS_6BITS;
+            break;
+        case 7:
+            pCfg->enmDataBitCount = RTSERIALPORTDATABITS_7BITS;
+            break;
+        case 8:
+            pCfg->enmDataBitCount = RTSERIALPORTDATABITS_8BITS;
+            break;
+        default:
+            AssertFailed();
+            return VERR_INTERNAL_ERROR;
+    }
+
+    switch (pThis->PortCfg.StopBits)
+    {
+        case ONESTOPBIT:
+            pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_ONE;
+            break;
+        case ONE5STOPBITS:
+            pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_ONEPOINTFIVE;
+            break;
+        case TWOSTOPBITS:
+            pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_TWO;
+            break;
+        default:
+            AssertFailed();
+            return VERR_INTERNAL_ERROR;
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTSerialPortCfgSet(RTSERIALPORT hSerialPort, PCRTSERIALPORTCFG pCfg, PRTERRINFO pErrInfo)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+
+    RT_NOREF(pErrInfo);
+
+    DCB DcbNew;
+    memcpy(&DcbNew, &pThis->PortCfg, sizeof(DcbNew));
+    DcbNew.BaudRate = pCfg->uBaudRate;
+
+    switch (pCfg->enmParity)
+    {
+        case RTSERIALPORTPARITY_NONE:
+            DcbNew.Parity = NOPARITY;
+            break;
+        case RTSERIALPORTPARITY_EVEN:
+            DcbNew.Parity = EVENPARITY;
+            break;
+        case RTSERIALPORTPARITY_ODD:
+            DcbNew.Parity = ODDPARITY;
+            break;
+        case RTSERIALPORTPARITY_MARK:
+            DcbNew.Parity = MARKPARITY;
+            break;
+        case RTSERIALPORTPARITY_SPACE:
+            DcbNew.Parity = SPACEPARITY;
+            break;
+        default:
+            AssertFailedReturn(VERR_INVALID_PARAMETER);
+    }
+
+    switch (pCfg->enmDataBitCount)
+    {
+        case RTSERIALPORTDATABITS_5BITS:
+            DcbNew.ByteSize = 5;
+            break;
+        case RTSERIALPORTDATABITS_6BITS:
+            DcbNew.ByteSize = 6;
+            break;
+        case RTSERIALPORTDATABITS_7BITS:
+            DcbNew.ByteSize = 7;
+            break;
+        case RTSERIALPORTDATABITS_8BITS:
+            DcbNew.ByteSize = 8;
+            break;
+        default:
+            AssertFailedReturn(VERR_INVALID_PARAMETER);
+    }
+
+    switch (pCfg->enmStopBitCount)
+    {
+        case RTSERIALPORTSTOPBITS_ONE:
+            DcbNew.StopBits = ONESTOPBIT;
+            break;
+        case RTSERIALPORTSTOPBITS_ONEPOINTFIVE:
+            AssertReturn(pCfg->enmDataBitCount == RTSERIALPORTDATABITS_5BITS, VERR_INVALID_PARAMETER);
+            DcbNew.StopBits = ONE5STOPBITS;
+            break;
+        case RTSERIALPORTSTOPBITS_TWO:
+            AssertReturn(pCfg->enmDataBitCount != RTSERIALPORTDATABITS_5BITS, VERR_INVALID_PARAMETER);
+            DcbNew.StopBits = TWOSTOPBITS;
+            break;
+        default:
+            AssertFailedReturn(VERR_INVALID_PARAMETER);
+    }
+
+    int rc = VINF_SUCCESS;
+    if (!SetCommState(pThis->hDev, &DcbNew))
+        rc = RTErrConvertFromWin32(GetLastError());
+    else
+        memcpy(&pThis->PortCfg, &DcbNew, sizeof(DcbNew));
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortEvtPoll(RTSERIALPORT hSerialPort, uint32_t fEvtMask, uint32_t *pfEvtsRecv,
+                                RTMSINTERVAL msTimeout)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!(fEvtMask & ~RTSERIALPORT_EVT_F_VALID_MASK), VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pfEvtsRecv, VERR_INVALID_POINTER);
+
+    *pfEvtsRecv = 0;
+
+    int rc = VINF_SUCCESS;
+    if (fEvtMask != pThis->fEvtMask)
+    {
+        rc = rtSerialPortWinUpdateEvtMask(pThis, fEvtMask);
+        if (   RT_SUCCESS(rc)
+            && pThis->fEvtQueryPending)
+        {
+            /*
+             * Setting a new event mask lets the WaitCommEvent() call finish immediately,
+             * so clean up and process any events here.
+             */
+            rc = rtSerialPortEvtWaitWorker(pThis, 1);
+            AssertRC(rc);
+
+            if (pThis->dwEventMask != 0)
+            {
+                pThis->fEvtQueryPending = false;
+                return rtSerialPortEvtFlagsProcess(pThis, pThis->dwEventMask, pfEvtsRecv);
+            }
+        }
+    }
+
+    /*
+     * EV_RXCHAR is triggered only if a byte is received after the event mask is set,
+     * not if there is already something in the input buffer. Thatswhy we check the input
+     * buffer for any stored data and the output buffer whether it is empty and return
+     * the appropriate flags.
+     */
+    if (RT_SUCCESS(rc))
+    {
+        COMSTAT ComStat; RT_ZERO(ComStat);
+        if (!ClearCommError(pThis->hDev, NULL, &ComStat))
+            return RTErrConvertFromWin32(GetLastError());
+
+        /* Check whether data is already waiting in the input buffer. */
+        if (   (fEvtMask & RTSERIALPORT_EVT_F_DATA_RX)
+            && ComStat.cbInQue > 0)
+            *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_RX;
+
+        /* Check whether the output buffer is empty. */
+        if (   (fEvtMask & RTSERIALPORT_EVT_F_DATA_TX)
+            && ComStat.cbOutQue == 0)
+            *pfEvtsRecv |= RTSERIALPORT_EVT_F_DATA_TX;
+
+        /* Return if there is at least one event. */
+        if (*pfEvtsRecv != 0)
+            return VINF_SUCCESS;
+    }
+
+    if (RT_SUCCESS(rc))
+    {
+        /* Set up a new event wait if there is none pending. */
+        if (!pThis->fEvtQueryPending)
+        {
+            RT_ZERO(pThis->OverlappedEvt);
+            pThis->OverlappedEvt.hEvent = pThis->hEvtDev;
+
+            pThis->dwEventMask = 0;
+            pThis->fEvtQueryPending = true;
+            if (!WaitCommEvent(pThis->hDev, &pThis->dwEventMask, &pThis->OverlappedEvt))
+            {
+                DWORD dwRet = GetLastError();
+                if (dwRet == ERROR_IO_PENDING)
+                    rc = VINF_SUCCESS;
+                else
+                {
+                    rc = RTErrConvertFromWin32(GetLastError());
+                    pThis->fEvtQueryPending = false;
+                }
+            }
+            else
+                pThis->fEvtQueryPending = false;
+        }
+
+        if (   RT_SUCCESS(rc)
+            && pThis->fEvtQueryPending)
+            rc = rtSerialPortEvtWaitWorker(pThis, msTimeout);
+
+        if (RT_SUCCESS(rc))
+        {
+            pThis->fEvtQueryPending = false;
+            rc = rtSerialPortEvtFlagsProcess(pThis, pThis->dwEventMask, pfEvtsRecv);
+        }
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortEvtPollInterrupt(RTSERIALPORT hSerialPort)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+
+    if (!SetEvent(pThis->hEvtIntr))
+        return RTErrConvertFromWin32(GetLastError());
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTSerialPortChgBreakCondition(RTSERIALPORT hSerialPort, bool fSet)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+
+    BOOL fSucc = FALSE;
+    if (fSet)
+        fSucc = SetCommBreak(pThis->hDev);
+    else
+        fSucc = ClearCommBreak(pThis->hDev);
+
+    int rc = VINF_SUCCESS;
+    if (!fSucc)
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortChgStatusLines(RTSERIALPORT hSerialPort, uint32_t fClear, uint32_t fSet)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+
+    BOOL fSucc = TRUE;
+    if (fSet & RTSERIALPORT_CHG_STS_LINES_F_DTR)
+        fSucc = EscapeCommFunction(pThis->hDev, SETDTR);
+    if (   fSucc
+        && (fSet & RTSERIALPORT_CHG_STS_LINES_F_RTS))
+        fSucc = EscapeCommFunction(pThis->hDev, SETRTS);
+
+    if (   fSucc
+        && (fClear & RTSERIALPORT_CHG_STS_LINES_F_DTR))
+        fSucc = EscapeCommFunction(pThis->hDev, CLRDTR);
+    if (   fSucc
+        && (fClear & RTSERIALPORT_CHG_STS_LINES_F_RTS))
+        fSucc = EscapeCommFunction(pThis->hDev, CLRRTS);
+
+    int rc = VINF_SUCCESS;
+    if (!fSucc)
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    return rc;
+}
+
+
+RTDECL(int) RTSerialPortQueryStatusLines(RTSERIALPORT hSerialPort, uint32_t *pfStsLines)
+{
+    PRTSERIALPORTINTERNAL pThis = hSerialPort;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pfStsLines, VERR_INVALID_POINTER);
+
+    *pfStsLines = 0;
+
+    int rc = VINF_SUCCESS;
+    DWORD fStsLinesQueried = 0;
+
+    /* Get the new state */
+    if (GetCommModemStatus(pThis->hDev, &fStsLinesQueried))
+    {
+        *pfStsLines |= (fStsLinesQueried & MS_RLSD_ON) ? RTSERIALPORT_STS_LINE_DCD : 0;
+        *pfStsLines |= (fStsLinesQueried & MS_RING_ON) ? RTSERIALPORT_STS_LINE_RI  : 0;
+        *pfStsLines |= (fStsLinesQueried & MS_DSR_ON) ? RTSERIALPORT_STS_LINE_DSR : 0;
+        *pfStsLines |= (fStsLinesQueried & MS_CTS_ON) ? RTSERIALPORT_STS_LINE_CTS : 0;
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/shmem-win.cpp b/src/VBox/Runtime/r3/win/shmem-win.cpp
new file mode 100644
index 00000000..9ac18e48
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/shmem-win.cpp
@@ -0,0 +1,463 @@
+/* $Id: shmem-win.cpp $ */
+/** @file
+ * IPRT - Named shared memory object, Windows Implementation.
+ */
+
+/*
+ * Copyright (C) 2018-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/nt/nt-and-windows.h>
+
+#include <iprt/shmem.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/cdefs.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+#include "internal/magics.h"
+#include "internal/path.h"
+#include "internal-r3-win.h" /* For g_enmWinVer + kRTWinOSType_XXX */
+
+/*
+ * Define values ourselves in case the compiling host is too old.
+ * See https://docs.microsoft.com/en-us/windows/desktop/api/winbase/nf-winbase-createfilemappinga
+ * for when these were introduced.
+ */
+#ifndef PAGE_EXECUTE_READ
+# define PAGE_EXECUTE_READ 0x20
+#endif
+#ifndef PAGE_EXECUTE_READWRITE
+# define PAGE_EXECUTE_READWRITE 0x40
+#endif
+#ifndef PAGE_EXECUTE_WRITECOPY
+# define PAGE_EXECUTE_WRITECOPY 0x80
+#endif
+#ifndef FILE_MAP_EXECUTE
+# define FILE_MAP_EXECUTE 0x20
+#endif
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+
+/**
+ * Shared memory object mapping descriptor.
+ */
+typedef struct RTSHMEMMAPPINGDESC
+{
+    /** Number of references held to this mapping, 0 if the descriptor is free. */
+    volatile uint32_t   cMappings;
+    /** Pointer to the region mapping. */
+    void               *pvMapping;
+    /** Start offset */
+    size_t              offRegion;
+    /** Size of the region. */
+    size_t              cbRegion;
+    /** Access flags for this region .*/
+    uint32_t            fFlags;
+} RTSHMEMMAPPINGDESC;
+/** Pointer to a shared memory object mapping descriptor. */
+typedef RTSHMEMMAPPINGDESC *PRTSHMEMMAPPINGDESC;
+/** Pointer to a constant shared memory object mapping descriptor. */
+typedef const RTSHMEMMAPPINGDESC *PCRTSHMEMMAPPINGDESC;
+
+
+/**
+ * Internal shared memory object state.
+ */
+typedef struct RTSHMEMINT
+{
+    /** Magic value (RTSHMEM_MAGIC). */
+    uint32_t            u32Magic;
+    /** Flag whether this instance created the named shared memory object. */
+    bool                fCreate;
+    /** Handle to the underlying mapping object. */
+    HANDLE              hShmObj;
+    /** Size of the mapping object in bytes. */
+    size_t              cbMax;
+    /** Overall number of mappings active for this shared memory object. */
+    volatile uint32_t   cMappings;
+    /** Maximum number of mapping descriptors allocated. */
+    uint32_t            cMappingDescsMax;
+    /** Number of mapping descriptors used. */
+    volatile uint32_t   cMappingDescsUsed;
+    /** Array of mapping descriptors - variable in size. */
+    RTSHMEMMAPPINGDESC  aMappingDescs[1];
+} RTSHMEMINT;
+/** Pointer to the internal shared memory object state. */
+typedef RTSHMEMINT *PRTSHMEMINT;
+
+
+
+
+/**
+ * Returns a mapping descriptor matching the given region properties or NULL if none was found.
+ *
+ * @returns Pointer to the matching mapping descriptor or NULL if not found.
+ * @param   pThis           Pointer to the shared memory object instance.
+ * @param   offRegion       Offset into the shared memory object to start mapping at.
+ * @param   cbRegion        Size of the region to map.
+ * @param   fFlags          Desired properties of the mapped region, combination of RTSHMEM_MAP_F_* defines.
+ */
+DECLINLINE(PRTSHMEMMAPPINGDESC) rtShMemMappingDescFindByProp(PRTSHMEMINT pThis, size_t offRegion, size_t cbRegion, uint32_t fFlags)
+{
+    for (uint32_t i = 0; i < pThis->cMappingDescsMax; i++)
+    {
+        if (   pThis->aMappingDescs[i].offRegion == offRegion
+            && pThis->aMappingDescs[i].cbRegion == cbRegion
+            && pThis->aMappingDescs[i].fFlags == fFlags)
+            return &pThis->aMappingDescs[i];
+    }
+
+    return NULL;
+}
+
+
+RTDECL(int) RTShMemOpen(PRTSHMEM phShMem, const char *pszName, uint32_t fFlags, size_t cbMax, uint32_t cMappingsHint)
+{
+    AssertPtrReturn(phShMem, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pszName, VERR_INVALID_PARAMETER);
+    AssertReturn(!(fFlags & ~RTSHMEM_O_F_VALID_MASK), VERR_INVALID_PARAMETER);
+    AssertReturn(cMappingsHint < 64, VERR_OUT_OF_RANGE);
+    AssertReturn(cbMax > 0 || !(fFlags & RTSHMEM_O_F_CREATE), VERR_NOT_SUPPORTED);
+
+    if (fFlags & RTSHMEM_O_F_TRUNCATE)
+        return VERR_NOT_SUPPORTED;
+
+    /*
+     * The executable access was introduced with Windows XP SP2 and Windows Server 2003 SP1,
+     * PAGE_EXECUTE_WRITECOPY was not available until Windows Vista SP1.
+     * Allow execute mappings only starting from Windows 7 to keep the checks simple here (lazy coder).
+     */
+    if (   (fFlags & RTSHMEM_O_F_MAYBE_EXEC)
+        && g_enmWinVer < kRTWinOSType_7)
+        return VERR_NOT_SUPPORTED;
+
+    cMappingsHint = cMappingsHint == 0 ? 5 : cMappingsHint;
+    int rc = VINF_SUCCESS;
+    PRTSHMEMINT pThis = (PRTSHMEMINT)RTMemAllocZ(RT_UOFFSETOF_DYN(RTSHMEMINT, aMappingDescs[cMappingsHint]));
+    if (RT_LIKELY(pThis))
+    {
+        pThis->u32Magic            = RTSHMEM_MAGIC;
+        /*pThis->fCreate           = false; */
+        /*pThis->cMappings         = 0; */
+        pThis->cMappingDescsMax    = cMappingsHint;
+        /*pThis->cMappingDescsUsed = 0; */
+        /* Construct the filename, always use the local namespace, global requires special privileges. */
+        char szName[RTPATH_MAX];
+        ssize_t cch = RTStrPrintf2(&szName[0], sizeof(szName), "Local\\%s", pszName);
+        if (cch > 0)
+        {
+            PRTUTF16 pwszName = NULL;
+            rc = RTStrToUtf16Ex(&szName[0], RTSTR_MAX, &pwszName, 0, NULL);
+            if (RT_SUCCESS(rc))
+            {
+                if (fFlags & RTSHMEM_O_F_CREATE)
+                {
+#if HC_ARCH_BITS == 64
+                    DWORD dwSzMaxHigh = cbMax >> 32;
+#elif HC_ARCH_BITS == 32
+                    DWORD dwSzMaxHigh = 0;
+#else
+# error "Port me"
+#endif
+                    DWORD dwSzMaxLow = cbMax & UINT32_C(0xffffffff);
+                    DWORD fProt = 0;
+
+                    if (fFlags & RTSHMEM_O_F_MAYBE_EXEC)
+                    {
+                        if ((fFlags & RTSHMEM_O_F_READWRITE) == RTSHMEM_O_F_READ)
+                            fProt |= PAGE_EXECUTE_READ;
+                        else
+                            fProt |= PAGE_EXECUTE_READWRITE;
+                    }
+                    else
+                    {
+                        if ((fFlags & RTSHMEM_O_F_READWRITE) == RTSHMEM_O_F_READ)
+                            fProt |= PAGE_READONLY;
+                        else
+                            fProt |= PAGE_READWRITE;
+                    }
+                    pThis->hShmObj = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL, fProt,
+                                                        dwSzMaxHigh, dwSzMaxLow, pwszName);
+                }
+                else
+                {
+                    DWORD fProt = SECTION_QUERY;
+                    if (fFlags & RTSHMEM_O_F_MAYBE_EXEC)
+                        fProt |= FILE_MAP_EXECUTE;
+                    if (fFlags & RTSHMEM_O_F_READ)
+                        fProt |= FILE_MAP_READ;
+                    if (fFlags & RTSHMEM_O_F_WRITE)
+                        fProt |= FILE_MAP_WRITE;
+
+                    pThis->hShmObj = OpenFileMappingW(fProt, FALSE, pwszName);
+                }
+                RTUtf16Free(pwszName);
+                if (pThis->hShmObj != NULL)
+                {
+                    *phShMem = pThis;
+                    return VINF_SUCCESS;
+                }
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+        }
+        else
+            rc = VERR_BUFFER_OVERFLOW;
+
+        RTMemFree(pThis);
+    }
+    else
+        rc = VERR_NO_MEMORY;
+
+    return rc;
+}
+
+
+RTDECL(int) RTShMemClose(RTSHMEM hShMem)
+{
+    PRTSHMEMINT pThis = hShMem;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->cMappings, VERR_INVALID_STATE);
+
+    int rc = VINF_SUCCESS;
+    if (CloseHandle(pThis->hShmObj))
+    {
+        pThis->u32Magic = RTSHMEM_MAGIC_DEAD;
+        RTMemFree(pThis);
+    }
+    else
+        rc = RTErrConvertFromWin32(GetLastError());
+
+    return rc;
+}
+
+
+RTDECL(int) RTShMemDelete(const char *pszName)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertReturn(*pszName != '\0', VERR_INVALID_PARAMETER);
+
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(uint32_t) RTShMemRefCount(RTSHMEM hShMem)
+{
+    PRTSHMEMINT pThis = hShMem;
+    AssertPtrReturn(pThis, 0);
+    AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, 0);
+
+    return pThis->cMappings;
+}
+
+
+RTDECL(int) RTShMemSetSize(RTSHMEM hShMem, size_t cbMem)
+{
+    PRTSHMEMINT pThis = hShMem;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!pThis->cMappings, VERR_INVALID_STATE);
+    AssertReturn(cbMem, VERR_NOT_SUPPORTED);
+
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(int) RTShMemQuerySize(RTSHMEM hShMem, size_t *pcbMem)
+{
+    PRTSHMEMINT pThis = hShMem;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pcbMem, VERR_INVALID_PARAMETER);
+
+    int rc = VINF_SUCCESS;
+    SECTION_BASIC_INFORMATION SecInf;
+    SIZE_T cbRet;
+    NTSTATUS rcNt = NtQuerySection(pThis->hShmObj, SectionBasicInformation, &SecInf, sizeof(SecInf), &cbRet);
+    if (NT_SUCCESS(rcNt))
+    {
+        AssertReturn(cbRet == sizeof(SecInf), VERR_INTERNAL_ERROR);
+#if HC_ARCH_BITS == 32
+        AssertReturn(SecInf.MaximumSize.HighPart == 0, VERR_INTERNAL_ERROR_2);
+        *pcbMem = SecInf.MaximumSize.LowPart;
+#elif HC_ARCH_BITS == 64
+        *pcbMem = SecInf.MaximumSize.QuadPart;
+#else
+# error "Port me"
+#endif
+    }
+    else
+        rc = RTErrConvertFromNtStatus(rcNt);
+
+    return rc;
+}
+
+
+RTDECL(int) RTShMemMapRegion(RTSHMEM hShMem, size_t offRegion, size_t cbRegion, uint32_t fFlags, void **ppv)
+{
+    PRTSHMEMINT pThis = hShMem;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(ppv, VERR_INVALID_PARAMETER);
+    AssertReturn(!(fFlags & ~RTSHMEM_MAP_F_VALID_MASK), VERR_INVALID_PARAMETER);
+
+    /* See comment in RTShMemOpen(). */
+    if (   (fFlags & RTSHMEM_MAP_F_EXEC)
+        && g_enmWinVer < kRTWinOSType_7)
+        return VERR_NOT_SUPPORTED;
+
+    /* Try to find a mapping with compatible parameters first. */
+    PRTSHMEMMAPPINGDESC pMappingDesc = NULL;
+    for (uint32_t iTry = 0; iTry < 10; iTry++)
+    {
+        pMappingDesc = rtShMemMappingDescFindByProp(pThis, offRegion, cbRegion, fFlags);
+        if (!pMappingDesc)
+            break;
+
+        /* Increase the mapping count and check that the region is still accessible by us. */
+        if (   ASMAtomicIncU32(&pMappingDesc->cMappings) > 1
+            && pMappingDesc->offRegion == offRegion
+            && pMappingDesc->cbRegion  == cbRegion
+            && pMappingDesc->fFlags    == fFlags)
+            break;
+        /* Mapping was freed inbetween, next round. */
+    }
+
+    int rc = VINF_SUCCESS;
+    if (!pMappingDesc)
+    {
+        /* Find an empty region descriptor and map the region. */
+        for (uint32_t i = 0; i < pThis->cMappingDescsMax && !pMappingDesc; i++)
+        {
+            if (!pThis->aMappingDescs[i].cMappings)
+            {
+                pMappingDesc = &pThis->aMappingDescs[i];
+
+                /* Try to grab this one. */
+                if (ASMAtomicIncU32(&pMappingDesc->cMappings) == 1)
+                    break;
+
+                /* Somebody raced us, drop reference and continue. */
+                ASMAtomicDecU32(&pMappingDesc->cMappings);
+                pMappingDesc = NULL;
+            }
+        }
+
+        if (RT_LIKELY(pMappingDesc))
+        {
+            /* Try to map it. */
+            DWORD fProt = 0;
+            DWORD offLow = offRegion & UINT32_C(0xffffffff);
+#if HC_ARCH_BITS == 64
+            DWORD offHigh = offRegion >> 32;
+#elif HC_ARCH_BITS == 32
+            DWORD offHigh = 0;
+#else
+# error "Port me"
+#endif
+            if (fFlags & RTSHMEM_MAP_F_READ)
+                fProt |= FILE_MAP_READ;
+            if (fFlags & RTSHMEM_MAP_F_WRITE)
+                fProt |= FILE_MAP_WRITE;
+            if (fFlags & RTSHMEM_MAP_F_EXEC)
+                fProt |= FILE_MAP_EXECUTE;
+            if (fFlags & RTSHMEM_MAP_F_COW)
+                fProt |= FILE_MAP_COPY;
+
+            void *pv = MapViewOfFile(pThis->hShmObj, fProt, offHigh, offLow, cbRegion);
+            if (pv != NULL)
+            {
+                pMappingDesc->pvMapping = pv;
+                pMappingDesc->offRegion = offRegion;
+                pMappingDesc->cbRegion  = cbRegion;
+                pMappingDesc->fFlags    = fFlags;
+            }
+            else
+            {
+                rc = RTErrConvertFromWin32(GetLastError());
+                ASMAtomicDecU32(&pMappingDesc->cMappings);
+            }
+        }
+        else
+            rc = VERR_SHMEM_MAXIMUM_MAPPINGS_REACHED;
+    }
+
+    if (RT_SUCCESS(rc))
+    {
+        *ppv = pMappingDesc->pvMapping;
+        ASMAtomicIncU32(&pThis->cMappings);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTShMemUnmapRegion(RTSHMEM hShMem, void *pv)
+{
+    PRTSHMEMINT pThis = hShMem;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
+    AssertPtrReturn(pv, VERR_INVALID_PARAMETER);
+
+    /* Find the mapping descriptor by the given region address. */
+    PRTSHMEMMAPPINGDESC pMappingDesc = NULL;
+    for (uint32_t i = 0; i < pThis->cMappingDescsMax && !pMappingDesc; i++)
+    {
+        if (pThis->aMappingDescs[i].pvMapping == pv)
+        {
+            pMappingDesc = &pThis->aMappingDescs[i];
+            break;
+        }
+    }
+
+    AssertPtrReturn(pMappingDesc, VERR_INVALID_PARAMETER);
+
+    int rc = VINF_SUCCESS;
+    if (!ASMAtomicDecU32(&pMappingDesc->cMappings))
+    {
+        /* Last mapping of this region was unmapped, so do the real unmapping now. */
+        if (UnmapViewOfFile(pv))
+        {
+            ASMAtomicDecU32(&pThis->cMappingDescsUsed);
+            ASMAtomicDecU32(&pThis->cMappings);
+        }
+        else
+        {
+            ASMAtomicIncU32(&pMappingDesc->cMappings);
+            rc = RTErrConvertFromWin32(GetLastError());
+        }
+    }
+
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/symlink-win.cpp b/src/VBox/Runtime/r3/win/symlink-win.cpp
new file mode 100644
index 00000000..8da5cea3
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/symlink-win.cpp
@@ -0,0 +1,357 @@
+/* $Id: symlink-win.cpp $ */
+/** @file
+ * IPRT - Symbolic Links, Windows.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SYMLINK
+#include <iprt/win/windows.h>
+
+#include <iprt/symlink.h>
+#include "internal-r3-win.h"
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/log.h>
+#include <iprt/path.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+#include "internal/path.h"
+
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef struct MY_REPARSE_DATA_BUFFER
+{
+    ULONG           ReparseTag;
+#define MY_IO_REPARSE_TAG_SYMLINK       0xa000000c
+#define MY_IO_REPARSE_TAG_MOUNT_POINT   0xa0000003
+
+    USHORT          ReparseDataLength;
+    USHORT          Reserved;
+    union
+    {
+        struct
+        {
+            USHORT  SubstituteNameOffset;
+            USHORT  SubstituteNameLength;
+            USHORT  PrintNameOffset;
+            USHORT  PrintNameLength;
+            ULONG   Flags;
+#define MY_SYMLINK_FLAG_RELATIVE 1
+            WCHAR   PathBuffer[1];
+        } SymbolicLinkReparseBuffer;
+        struct
+        {
+            USHORT  SubstituteNameOffset;
+            USHORT  SubstituteNameLength;
+            USHORT  PrintNameOffset;
+            USHORT  PrintNameLength;
+            WCHAR   PathBuffer[1];
+        } MountPointReparseBuffer;
+        struct
+        {
+            UCHAR   DataBuffer[1];
+        } GenericReparseBuffer;
+    };
+} MY_REPARSE_DATA_BUFFER;
+#define MY_FSCTL_GET_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+
+RTDECL(bool) RTSymlinkExists(const char *pszSymlink)
+{
+    bool        fRc = false;
+    RTFSOBJINFO ObjInfo;
+    int rc = RTPathQueryInfoEx(pszSymlink, &ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK);
+    if (RT_SUCCESS(rc))
+        fRc = RTFS_IS_SYMLINK(ObjInfo.Attr.fMode);
+
+    LogFlow(("RTSymlinkExists(%p={%s}): returns %RTbool\n", pszSymlink, pszSymlink, fRc));
+    return fRc;
+}
+
+
+RTDECL(bool) RTSymlinkIsDangling(const char *pszSymlink)
+{
+    bool        fRc = false;
+    RTFSOBJINFO ObjInfo;
+    int rc = RTPathQueryInfoEx(pszSymlink, &ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK);
+    if (RT_SUCCESS(rc))
+    {
+        fRc = RTFS_IS_SYMLINK(ObjInfo.Attr.fMode);
+        if (fRc)
+        {
+            rc = RTPathQueryInfoEx(pszSymlink, &ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
+            fRc = !RT_SUCCESS_NP(rc);
+        }
+    }
+
+    LogFlow(("RTSymlinkIsDangling(%p={%s}): returns %RTbool\n", pszSymlink, pszSymlink, fRc));
+    return fRc;
+}
+
+
+RTDECL(int) RTSymlinkCreate(const char *pszSymlink, const char *pszTarget, RTSYMLINKTYPE enmType, uint32_t fCreate)
+{
+    /*
+     * Validate the input.
+     */
+    AssertReturn(enmType > RTSYMLINKTYPE_INVALID && enmType < RTSYMLINKTYPE_END, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pszSymlink, VERR_INVALID_POINTER);
+    AssertPtrReturn(pszTarget, VERR_INVALID_POINTER);
+    RT_NOREF_PV(fCreate);
+
+    /*
+     * Resolve the API.
+     */
+    typedef BOOLEAN (WINAPI *PFNCREATESYMBOLICLINKW)(LPCWSTR, LPCWSTR, DWORD);
+    static PFNCREATESYMBOLICLINKW   s_pfnCreateSymbolicLinkW = NULL;
+    static bool                     s_fTried = FALSE;
+    if (!s_fTried)
+    {
+        PFNCREATESYMBOLICLINKW pfn = (PFNCREATESYMBOLICLINKW)GetProcAddress(g_hModKernel32, "CreateSymbolicLinkW");
+        if (pfn)
+            s_pfnCreateSymbolicLinkW = pfn;
+        s_fTried = true;
+    }
+    if (!s_pfnCreateSymbolicLinkW)
+    {
+        LogFlow(("RTSymlinkCreate(%p={%s}, %p={%s}, %d, %#x): returns VERR_NOT_SUPPORTED - Windows API not found\n",
+                 pszSymlink, pszSymlink, pszTarget, pszTarget, enmType, fCreate));
+        return VERR_NOT_SUPPORTED;
+    }
+
+    /*
+     * Convert the paths.
+     */
+    PRTUTF16 pwszNativeSymlink;
+    int rc = RTPathWinFromUtf8(&pwszNativeSymlink, pszSymlink, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        PRTUTF16 pwszNativeTarget;
+        rc = RTPathWinFromUtf8(&pwszNativeTarget, pszTarget, 0 /*fFlags*/);
+        if (RT_SUCCESS(rc))
+        {
+            /* The link target path must use backslashes to work reliably. */
+            RTUTF16  wc;
+            PRTUTF16 pwsz = pwszNativeTarget;
+            while ((wc = *pwsz) != '\0')
+            {
+                if (wc == '/')
+                    *pwsz = '\\';
+                pwsz++;
+            }
+
+            /*
+             * Massage the target path, determin the link type.
+             */
+            size_t cchTarget        = strlen(pszTarget);
+            size_t cchVolSpecTarget = rtPathVolumeSpecLen(pszTarget);
+#if 0 /* looks like this isn't needed after all. That makes everything much simper :-) */
+            if (   cchTarget > RT_MIN(cchVolSpecTarget, 1)
+                && RTPATH_IS_SLASH(pszTarget[cchTarget - 1]))
+            {
+                size_t cwcNativeTarget = RTUtf16Len(pwszNativeTarget);
+                size_t offFromEnd = 1;
+                while (   offFromEnd < cchTarget
+                       && cchTarget - offFromEnd >= cchVolSpecTarget
+                       && RTPATH_IS_SLASH(pszTarget[cchTarget - offFromEnd]))
+                {
+                    Assert(offFromEnd < cwcNativeTarget);
+                    pwszNativeTarget[cwcNativeTarget - offFromEnd] = 0;
+                    offFromEnd++;
+                }
+            }
+#endif
+
+            if (enmType == RTSYMLINKTYPE_UNKNOWN)
+            {
+                if (   cchTarget > cchVolSpecTarget
+                    && RTPATH_IS_SLASH(pszTarget[cchTarget - 1]))
+                    enmType = RTSYMLINKTYPE_DIR;
+                else if (cchVolSpecTarget)
+                {
+                    /** @todo this is subject to sharing violations. */
+                    DWORD dwAttr = GetFileAttributesW(pwszNativeTarget);
+                    if (   dwAttr != INVALID_FILE_ATTRIBUTES
+                        && (dwAttr & FILE_ATTRIBUTE_DIRECTORY))
+                        enmType = RTSYMLINKTYPE_DIR;
+                }
+                else
+                {
+                    /** @todo Join the symlink directory with the target and
+                     *        look up the attributes on that. -lazy bird. */
+                }
+            }
+
+            /*
+             * Create the link.
+             */
+            if (s_pfnCreateSymbolicLinkW(pwszNativeSymlink, pwszNativeTarget, enmType == RTSYMLINKTYPE_DIR))
+                rc = VINF_SUCCESS;
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+
+            RTPathWinFree(pwszNativeTarget);
+        }
+        RTPathWinFree(pwszNativeSymlink);
+    }
+
+    LogFlow(("RTSymlinkCreate(%p={%s}, %p={%s}, %d, %#x): returns %Rrc\n", pszSymlink, pszSymlink, pszTarget, pszTarget, enmType, fCreate, rc));
+    return rc;
+}
+
+
+RTDECL(int) RTSymlinkDelete(const char *pszSymlink, uint32_t fDelete)
+{
+    RT_NOREF_PV(fDelete);
+
+    /*
+     * Convert the path.
+     */
+    PRTUTF16 pwszNativeSymlink;
+    int rc = RTPathWinFromUtf8(&pwszNativeSymlink, pszSymlink, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * We have to use different APIs depending on whether this is a
+         * directory or file link.  This means we're subject to one more race
+         * than on posix at the moment.  We could probably avoid this though,
+         * if we wanted to go talk with the native API layer below Win32...
+         */
+        DWORD dwAttr = GetFileAttributesW(pwszNativeSymlink);
+        if (dwAttr != INVALID_FILE_ATTRIBUTES)
+        {
+            if (dwAttr & FILE_ATTRIBUTE_REPARSE_POINT)
+            {
+                BOOL fRc;
+                if (dwAttr & FILE_ATTRIBUTE_DIRECTORY)
+                    fRc = RemoveDirectoryW(pwszNativeSymlink);
+                else
+                    fRc = DeleteFileW(pwszNativeSymlink);
+                if (fRc)
+                    rc = VINF_SUCCESS;
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            else
+                rc = VERR_NOT_SYMLINK;
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+        RTPathWinFree(pwszNativeSymlink);
+    }
+
+    LogFlow(("RTSymlinkDelete(%p={%s}, %#x): returns %Rrc\n", pszSymlink, pszSymlink, fDelete, rc));
+    return rc;
+}
+
+
+RTDECL(int) RTSymlinkRead(const char *pszSymlink, char *pszTarget, size_t cbTarget, uint32_t fRead)
+{
+    RT_NOREF_PV(fRead);
+
+    char *pszMyTarget;
+    int rc = RTSymlinkReadA(pszSymlink, &pszMyTarget);
+    if (RT_SUCCESS(rc))
+    {
+        rc = RTStrCopy(pszTarget, cbTarget, pszMyTarget);
+        RTStrFree(pszMyTarget);
+    }
+    LogFlow(("RTSymlinkRead(%p={%s}): returns %Rrc\n", pszSymlink, pszSymlink, rc));
+    return rc;
+}
+
+
+RTDECL(int) RTSymlinkReadA(const char *pszSymlink, char **ppszTarget)
+{
+    AssertPtr(ppszTarget);
+    PRTUTF16 pwszNativeSymlink;
+    int rc = RTPathWinFromUtf8(&pwszNativeSymlink, pszSymlink, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        HANDLE hSymlink = CreateFileW(pwszNativeSymlink,
+                                      GENERIC_READ,
+                                      FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                                      NULL,
+                                      OPEN_EXISTING,
+                                      FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
+                                      NULL);
+        if (hSymlink != INVALID_HANDLE_VALUE)
+        {
+            DWORD cbReturned = 0;
+            union
+            {
+                MY_REPARSE_DATA_BUFFER  Buf;
+                uint8_t                 abBuf[16*_1K + sizeof(WCHAR)];
+            } u;
+            if (DeviceIoControl(hSymlink,
+                                MY_FSCTL_GET_REPARSE_POINT,
+                                NULL /*pInBuffer */,
+                                0 /*cbInBuffer */,
+                                &u.Buf,
+                                sizeof(u) - sizeof(WCHAR),
+                                &cbReturned,
+                                NULL /*pOverlapped*/))
+            {
+                if (u.Buf.ReparseTag == MY_IO_REPARSE_TAG_SYMLINK)
+                {
+                    PWCHAR pwszTarget = &u.Buf.SymbolicLinkReparseBuffer.PathBuffer[0];
+                    pwszTarget += u.Buf.SymbolicLinkReparseBuffer.SubstituteNameOffset / 2;
+                    pwszTarget[u.Buf.SymbolicLinkReparseBuffer.SubstituteNameLength / 2] = 0;
+                    if (   !(u.Buf.SymbolicLinkReparseBuffer.Flags & MY_SYMLINK_FLAG_RELATIVE)
+                        && pwszTarget[0] == '\\'
+                        && pwszTarget[1] == '?'
+                        && pwszTarget[2] == '?'
+                        && pwszTarget[3] == '\\'
+                        && pwszTarget[4] != 0
+                       )
+                        pwszTarget += 4;
+                    rc = RTUtf16ToUtf8(pwszTarget, ppszTarget);
+                }
+                else
+                    rc = VERR_NOT_SYMLINK;
+            }
+            else
+                rc = RTErrConvertFromWin32(GetLastError());
+            CloseHandle(hSymlink);
+        }
+        else
+            rc = RTErrConvertFromWin32(GetLastError());
+        RTPathWinFree(pwszNativeSymlink);
+    }
+
+    if (RT_SUCCESS(rc))
+        LogFlow(("RTSymlinkReadA(%p={%s},%p): returns %Rrc *ppszTarget=%p:{%s}\n", pszSymlink, pszSymlink, ppszTarget, rc, *ppszTarget, *ppszTarget));
+    else
+        LogFlow(("RTSymlinkReadA(%p={%s},%p): returns %Rrc\n", pszSymlink, pszSymlink, ppszTarget, rc));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/thread-win.cpp b/src/VBox/Runtime/r3/win/thread-win.cpp
new file mode 100644
index 00000000..06e4e8a9
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/thread-win.cpp
@@ -0,0 +1,430 @@
+/* $Id: thread-win.cpp $ */
+/** @file
+ * IPRT - Threads, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_THREAD
+#include <iprt/nt/nt-and-windows.h>
+
+#include <errno.h>
+#include <process.h>
+
+#include <iprt/thread.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/assert.h>
+#include <iprt/cpuset.h>
+#include <iprt/err.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/param.h>
+#include "internal/thread.h"
+#include "internal-r3-win.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The TLS index allocated for storing the RTTHREADINT pointer. */
+static DWORD g_dwSelfTLS = TLS_OUT_OF_INDEXES;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static unsigned __stdcall rtThreadNativeMain(void *pvArgs);
+static void rtThreadWinTellDebuggerThreadName(uint32_t idThread, const char *pszName);
+
+
+DECLHIDDEN(int) rtThreadNativeInit(void)
+{
+    g_dwSelfTLS = TlsAlloc();
+    if (g_dwSelfTLS == TLS_OUT_OF_INDEXES)
+        return VERR_NO_TLS_FOR_SELF;
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(void) rtThreadNativeReInitObtrusive(void)
+{
+    /* nothing to do here. */
+}
+
+
+DECLHIDDEN(void) rtThreadNativeDetach(void)
+{
+    /*
+     * Deal with alien threads.
+     */
+    PRTTHREADINT pThread = (PRTTHREADINT)TlsGetValue(g_dwSelfTLS);
+    if (    pThread
+        &&  (pThread->fIntFlags & RTTHREADINT_FLAGS_ALIEN))
+    {
+        rtThreadTerminate(pThread, 0);
+        TlsSetValue(g_dwSelfTLS, NULL);
+    }
+}
+
+
+DECLHIDDEN(void) rtThreadNativeDestroy(PRTTHREADINT pThread)
+{
+    if (pThread == (PRTTHREADINT)TlsGetValue(g_dwSelfTLS))
+        TlsSetValue(g_dwSelfTLS, NULL);
+
+    if ((HANDLE)pThread->hThread != INVALID_HANDLE_VALUE)
+    {
+        CloseHandle((HANDLE)pThread->hThread);
+        pThread->hThread = (uintptr_t)INVALID_HANDLE_VALUE;
+    }
+}
+
+
+DECLHIDDEN(int) rtThreadNativeAdopt(PRTTHREADINT pThread)
+{
+    if (!TlsSetValue(g_dwSelfTLS, pThread))
+        return VERR_FAILED_TO_SET_SELF_TLS;
+    if (IsDebuggerPresent())
+        rtThreadWinTellDebuggerThreadName(GetCurrentThreadId(), pThread->szName);
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(void) rtThreadNativeInformDebugger(PRTTHREADINT pThread)
+{
+    rtThreadWinTellDebuggerThreadName((uint32_t)(uintptr_t)pThread->Core.Key, pThread->szName);
+}
+
+
+/**
+ * Communicates the thread name to the debugger, if we're begin debugged that
+ * is.
+ *
+ * See http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx for debugger
+ * interface details.
+ *
+ * @param   idThread        The thread ID. UINT32_MAX for current thread.
+ * @param   pszName         The name.
+ */
+static void rtThreadWinTellDebuggerThreadName(uint32_t idThread, const char *pszName)
+{
+    struct
+    {
+        uint32_t    uType;
+        const char *pszName;
+        uint32_t    idThread;
+        uint32_t    fFlags;
+    } Pkg = { 0x1000, pszName, idThread, 0 };
+    __try
+    {
+        RaiseException(0x406d1388, 0, sizeof(Pkg)/sizeof(ULONG_PTR), (ULONG_PTR *)&Pkg);
+    }
+    __except(EXCEPTION_CONTINUE_EXECUTION)
+    {
+
+    }
+}
+
+
+/**
+ * Bitch about dangling COM and OLE references, dispose of them
+ * afterwards so we don't end up deadlocked somewhere below
+ * OLE32!DllMain.
+ */
+static void rtThreadNativeUninitComAndOle(void)
+{
+#if 1 /* experimental code */
+    /*
+     * Read the counters.
+     */
+    struct MySOleTlsData
+    {
+        void       *apvReserved0[2];    /**< x86=0x00  W7/64=0x00 */
+        DWORD       adwReserved0[3];    /**< x86=0x08  W7/64=0x10 */
+        void       *apvReserved1[1];    /**< x86=0x14  W7/64=0x20 */
+        DWORD       cComInits;          /**< x86=0x18  W7/64=0x28 */
+        DWORD       cOleInits;          /**< x86=0x1c  W7/64=0x2c */
+        DWORD       dwReserved1;        /**< x86=0x20  W7/64=0x30 */
+        void       *apvReserved2[4];    /**< x86=0x24  W7/64=0x38 */
+        DWORD       adwReserved2[1];    /**< x86=0x34  W7/64=0x58 */
+        void       *pvCurrentCtx;       /**< x86=0x38  W7/64=0x60 */
+        IUnknown   *pCallState;         /**< x86=0x3c  W7/64=0x68 */
+    }      *pOleTlsData = NULL;         /* outside the try/except for debugging */
+    DWORD   cComInits   = 0;
+    DWORD   cOleInits   = 0;
+    __try
+    {
+        void *pvTeb = NtCurrentTeb();
+# ifdef RT_ARCH_AMD64
+        pOleTlsData = *(struct MySOleTlsData **)((uintptr_t)pvTeb + 0x1758); /*TEB.ReservedForOle*/
+# elif RT_ARCH_X86
+        pOleTlsData = *(struct MySOleTlsData **)((uintptr_t)pvTeb + 0x0f80); /*TEB.ReservedForOle*/
+# else
+#  error "Port me!"
+# endif
+        if (pOleTlsData)
+        {
+            cComInits = pOleTlsData->cComInits;
+            cOleInits = pOleTlsData->cOleInits;
+        }
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        AssertFailedReturnVoid();
+    }
+
+    /*
+     * Assert sanity. If any of these breaks, the structure layout above is
+     * probably not correct any longer.
+     */
+    AssertMsgReturnVoid(cComInits < 1000, ("%u (%#x)\n", cComInits, cComInits));
+    AssertMsgReturnVoid(cOleInits < 1000, ("%u (%#x)\n", cOleInits, cOleInits));
+    AssertMsgReturnVoid(cComInits >= cOleInits, ("cComInits=%#x cOleInits=%#x\n", cComInits, cOleInits));
+
+    /*
+     * Do the uninitializing.
+     */
+    if (cComInits)
+    {
+        AssertMsgFailed(("cComInits=%u (%#x) cOleInits=%u (%#x) - dangling COM/OLE inits!\n",
+                         cComInits, cComInits, cOleInits, cOleInits));
+
+        HMODULE hOle32 = GetModuleHandle("ole32.dll");
+        AssertReturnVoid(hOle32 != NULL);
+
+        typedef void (WINAPI *PFNOLEUNINITIALIZE)(void);
+        PFNOLEUNINITIALIZE  pfnOleUninitialize = (PFNOLEUNINITIALIZE)GetProcAddress(hOle32, "OleUninitialize");
+        AssertReturnVoid(pfnOleUninitialize);
+
+        typedef void (WINAPI *PFNCOUNINITIALIZE)(void);
+        PFNCOUNINITIALIZE   pfnCoUninitialize  = (PFNCOUNINITIALIZE)GetProcAddress(hOle32, "CoUninitialize");
+        AssertReturnVoid(pfnCoUninitialize);
+
+        while (cOleInits-- > 0)
+        {
+            pfnOleUninitialize();
+            cComInits--;
+        }
+
+        while (cComInits-- > 0)
+            pfnCoUninitialize();
+    }
+#endif
+}
+
+
+/**
+ * Wrapper which unpacks the param stuff and calls thread function.
+ */
+static unsigned __stdcall rtThreadNativeMain(void *pvArgs)
+{
+    DWORD           dwThreadId = GetCurrentThreadId();
+    PRTTHREADINT    pThread = (PRTTHREADINT)pvArgs;
+
+    if (!TlsSetValue(g_dwSelfTLS, pThread))
+        AssertReleaseMsgFailed(("failed to set self TLS. lasterr=%d thread '%s'\n", GetLastError(), pThread->szName));
+    if (IsDebuggerPresent())
+        rtThreadWinTellDebuggerThreadName(dwThreadId, &pThread->szName[0]);
+
+    int rc = rtThreadMain(pThread, dwThreadId, &pThread->szName[0]);
+
+    TlsSetValue(g_dwSelfTLS, NULL);
+    rtThreadNativeUninitComAndOle();
+    _endthreadex(rc);
+    return rc;
+}
+
+
+DECLHIDDEN(int) rtThreadNativeCreate(PRTTHREADINT pThread, PRTNATIVETHREAD pNativeThread)
+{
+    AssertReturn(pThread->cbStack < ~(unsigned)0, VERR_INVALID_PARAMETER);
+
+    /*
+     * If a stack size is given, make sure it's not a multiple of 64KB so that we
+     * get one or more pages for overflow protection.  (ASSUMES 64KB alloc align.)
+     */
+    unsigned cbStack = (unsigned)pThread->cbStack;
+    if (cbStack > 0 && RT_ALIGN_T(cbStack, _64K, unsigned) == cbStack)
+        cbStack += PAGE_SIZE;
+
+    /*
+     * Create the thread.
+     */
+    pThread->hThread = (uintptr_t)INVALID_HANDLE_VALUE;
+    unsigned    uThreadId = 0;
+    uintptr_t   hThread   = _beginthreadex(NULL, cbStack, rtThreadNativeMain, pThread, 0, &uThreadId);
+    if (hThread != 0 && hThread != ~0U)
+    {
+        pThread->hThread = hThread;
+        *pNativeThread = uThreadId;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromErrno(errno);
+}
+
+
+DECLHIDDEN(bool) rtThreadNativeIsAliveKludge(PRTTHREADINT pThread)
+{
+    PPEB_COMMON pPeb = NtCurrentPeb();
+    if (!pPeb || !pPeb->Ldr || !pPeb->Ldr->ShutdownInProgress)
+        return true;
+    DWORD rcWait = WaitForSingleObject((HANDLE)pThread->hThread, 0);
+    return rcWait != WAIT_OBJECT_0;
+}
+
+
+RTDECL(RTTHREAD) RTThreadSelf(void)
+{
+    PRTTHREADINT pThread = (PRTTHREADINT)TlsGetValue(g_dwSelfTLS);
+    /** @todo import alien threads ? */
+    return pThread;
+}
+
+
+#if 0 /* noone is using this ... */
+/**
+ * Returns the processor number the current thread was running on during this call
+ *
+ * @returns processor nr
+ */
+static int rtThreadGetCurrentProcessorNumber(void)
+{
+    static bool           fInitialized = false;
+    static DWORD (WINAPI *pfnGetCurrentProcessorNumber)(void) = NULL;
+    if (!fInitialized)
+    {
+        HMODULE hmodKernel32 = GetModuleHandle("kernel32.dll");
+        if (hmodKernel32)
+            pfnGetCurrentProcessorNumber = (DWORD (WINAPI*)(void))GetProcAddress(hmodKernel32, "GetCurrentProcessorNumber");
+        fInitialized = true;
+    }
+    if (pfnGetCurrentProcessorNumber)
+        return pfnGetCurrentProcessorNumber();
+    return -1;
+}
+#endif
+
+
+RTR3DECL(int) RTThreadSetAffinity(PCRTCPUSET pCpuSet)
+{
+    DWORD_PTR fNewMask = pCpuSet ? RTCpuSetToU64(pCpuSet) : ~(DWORD_PTR)0;
+    DWORD_PTR dwRet = SetThreadAffinityMask(GetCurrentThread(), fNewMask);
+    if (dwRet)
+        return VINF_SUCCESS;
+
+    int iLastError = GetLastError();
+    AssertMsgFailed(("SetThreadAffinityMask failed, LastError=%d\n", iLastError));
+    return RTErrConvertFromWin32(iLastError);
+}
+
+
+RTR3DECL(int) RTThreadGetAffinity(PRTCPUSET pCpuSet)
+{
+    /*
+     * Haven't found no query api, but the set api returns the old mask, so let's use that.
+     */
+    DWORD_PTR dwIgnored;
+    DWORD_PTR dwProcAff = 0;
+    if (GetProcessAffinityMask(GetCurrentProcess(), &dwProcAff, &dwIgnored))
+    {
+        HANDLE hThread = GetCurrentThread();
+        DWORD_PTR dwRet = SetThreadAffinityMask(hThread, dwProcAff);
+        if (dwRet)
+        {
+            DWORD_PTR dwSet = SetThreadAffinityMask(hThread, dwRet);
+            Assert(dwSet == dwProcAff); NOREF(dwRet);
+
+            RTCpuSetFromU64(pCpuSet, (uint64_t)dwSet);
+            return VINF_SUCCESS;
+        }
+    }
+
+    int iLastError = GetLastError();
+    AssertMsgFailed(("SetThreadAffinityMask or GetProcessAffinityMask failed, LastError=%d\n", iLastError));
+    return RTErrConvertFromWin32(iLastError);
+}
+
+
+RTR3DECL(int) RTThreadGetExecutionTimeMilli(uint64_t *pKernelTime, uint64_t *pUserTime)
+{
+    uint64_t u64CreationTime, u64ExitTime, u64KernelTime, u64UserTime;
+
+    if (GetThreadTimes(GetCurrentThread(), (LPFILETIME)&u64CreationTime, (LPFILETIME)&u64ExitTime, (LPFILETIME)&u64KernelTime, (LPFILETIME)&u64UserTime))
+    {
+        *pKernelTime = u64KernelTime / 10000;    /* GetThreadTimes returns time in 100 ns units */
+        *pUserTime   = u64UserTime / 10000;    /* GetThreadTimes returns time in 100 ns units */
+        return VINF_SUCCESS;
+    }
+
+    int iLastError = GetLastError();
+    AssertMsgFailed(("GetThreadTimes failed, LastError=%d\n", iLastError));
+    return RTErrConvertFromWin32(iLastError);
+}
+
+
+/**
+ * Gets the native thread handle for a IPRT thread.
+ *
+ * @returns The thread handle. INVALID_HANDLE_VALUE on failure.
+ * @param   hThread     The IPRT thread handle.
+ *
+ * @note    Windows only.
+ * @note    Only valid after parent returns from the thread creation call.
+ */
+RTDECL(uintptr_t) RTThreadGetNativeHandle(RTTHREAD hThread)
+{
+    PRTTHREADINT pThread = rtThreadGet(hThread);
+    if (pThread)
+    {
+        uintptr_t hHandle = pThread->hThread;
+        rtThreadRelease(pThread);
+        return hHandle;
+    }
+    return (uintptr_t)INVALID_HANDLE_VALUE;
+}
+RT_EXPORT_SYMBOL(RTThreadGetNativeHandle);
+
+
+RTDECL(int) RTThreadPoke(RTTHREAD hThread)
+{
+    AssertReturn(hThread != RTThreadSelf(), VERR_INVALID_PARAMETER);
+    if (g_pfnNtAlertThread)
+    {
+        PRTTHREADINT pThread = rtThreadGet(hThread);
+        AssertReturn(pThread, VERR_INVALID_HANDLE);
+
+        NTSTATUS rcNt = g_pfnNtAlertThread((HANDLE)pThread->hThread);
+
+        rtThreadRelease(pThread);
+        if (NT_SUCCESS(rcNt))
+            return VINF_SUCCESS;
+        return RTErrConvertFromNtStatus(rcNt);
+    }
+    return VERR_NOT_IMPLEMENTED;
+}
+
diff --git a/src/VBox/Runtime/r3/win/thread2-win.cpp b/src/VBox/Runtime/r3/win/thread2-win.cpp
new file mode 100644
index 00000000..474e7ac9
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/thread2-win.cpp
@@ -0,0 +1,74 @@
+/* $Id: thread2-win.cpp $ */
+/** @file
+ * IPRT - Threads part 2, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_THREAD
+#include <iprt/win/windows.h>
+
+#include <iprt/thread.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/errcore.h>
+#include <iprt/log.h>
+#include "internal/thread.h"
+
+
+RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
+{
+    return (RTNATIVETHREAD)GetCurrentThreadId();
+}
+
+
+RTR3DECL(int)   RTThreadSleep(RTMSINTERVAL cMillies)
+{
+    LogFlow(("RTThreadSleep: cMillies=%d\n", cMillies));
+    Sleep(cMillies);
+    LogFlow(("RTThreadSleep: returning %Rrc (cMillies=%d)\n", VINF_SUCCESS, cMillies));
+    return VINF_SUCCESS;
+}
+
+
+RTR3DECL(int)   RTThreadSleepNoLog(RTMSINTERVAL cMillies)
+{
+    Sleep(cMillies);
+    return VINF_SUCCESS;
+}
+
+
+RTR3DECL(bool) RTThreadYield(void)
+{
+    uint64_t u64TS = ASMReadTSC();
+    Sleep(0);
+    u64TS = ASMReadTSC() - u64TS;
+    bool fRc = u64TS > 1500;
+    LogFlow(("RTThreadYield: returning %d (%llu ticks)\n", fRc, u64TS));
+    return fRc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/time-win.cpp b/src/VBox/Runtime/r3/win/time-win.cpp
new file mode 100644
index 00000000..3cf2900a
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/time-win.cpp
@@ -0,0 +1,199 @@
+/* $Id: time-win.cpp $ */
+/** @file
+ * IPRT - Time, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#include <iprt/nt/nt-and-windows.h>
+
+#include <iprt/time.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include "internal/time.h"
+#include "internal-r3-win.h"
+
+/*
+ * Note! The selected time source be the exact same one as we use in kernel land!
+ */
+//#define USE_TICK_COUNT
+//#define USE_PERFORMANCE_COUNTER
+//# define USE_FILE_TIME
+//#if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
+# define USE_INTERRUPT_TIME
+//#else
+//# define USE_TICK_COUNT
+//#endif
+
+
+
+DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
+{
+#if defined USE_TICK_COUNT
+    /*
+     * This would work if it didn't flip over every 49 (or so) days.
+     */
+    return (uint64_t)GetTickCount() * RT_NS_1MS_64;
+
+#elif defined USE_PERFORMANCE_COUNTER
+    /*
+     * Slow and not derived from InterruptTime.
+     */
+    static LARGE_INTEGER    llFreq;
+    static unsigned         uMult;
+    if (!llFreq.QuadPart)
+    {
+        if (!QueryPerformanceFrequency(&llFreq))
+            return (uint64_t)GetTickCount() * RT_NS_1MS_64;
+        llFreq.QuadPart /=    1000;
+        uMult            = 1000000;     /* no math genius, but this seemed to help avoiding floating point. */
+    }
+
+    LARGE_INTEGER   ll;
+    if (QueryPerformanceCounter(&ll))
+        return (ll.QuadPart * uMult) / llFreq.QuadPart;
+    return (uint64_t)GetTickCount() * RT_NS_1MS_64;
+
+#elif defined USE_FILE_TIME
+    /*
+     * This is SystemTime not InterruptTime.
+     */
+    uint64_t u64; /* manual say larger integer, should be safe to assume it's the same. */
+    GetSystemTimeAsFileTime((LPFILETIME)&u64);
+    return u64 * 100;
+
+#elif defined USE_INTERRUPT_TIME
+    /*
+     * Use interrupt time if we can (not possible on NT 3.1).
+     * Note! We cannot entirely depend on g_enmWinVer here as we're likely to
+     *       get called before IPRT is initialized.  Ditto g_hModNtDll.
+     */
+    static PFNRTLGETINTERRUPTTIMEPRECISE    s_pfnRtlGetInterruptTimePrecise = NULL;
+    static int volatile                     s_iCanUseUserSharedData         = -1;
+    int                                     iCanUseUserSharedData           = s_iCanUseUserSharedData;
+    if (iCanUseUserSharedData != -1)
+    { /* likely */ }
+    else
+    {
+        /* We may be called before g_enmWinVer has been initialized. */
+        if (g_enmWinVer != kRTWinOSType_UNKNOWN)
+            iCanUseUserSharedData = g_enmWinVer > kRTWinOSType_NT310;
+        else
+        {
+            DWORD dwVer = GetVersion();
+            iCanUseUserSharedData = (dwVer & 0xff) != 3 || ((dwVer >> 8) & 0xff) >= 50;
+        }
+        if (iCanUseUserSharedData != 0)
+        {
+            FARPROC pfn = GetProcAddress(g_hModNtDll ? g_hModNtDll : GetModuleHandleW(L"ntdll"), "RtlGetInterruptTimePrecise");
+            if (pfn != NULL)
+            {
+                ASMAtomicWritePtr(&s_pfnRtlGetInterruptTimePrecise, pfn);
+                iCanUseUserSharedData = 42;
+            }
+        }
+        s_iCanUseUserSharedData = iCanUseUserSharedData;
+    }
+
+    if (iCanUseUserSharedData != 0)
+    {
+        LARGE_INTEGER Time;
+        if (iCanUseUserSharedData == 42)
+        {
+            uint64_t iIgnored;
+            Time.QuadPart = s_pfnRtlGetInterruptTimePrecise(&iIgnored);
+        }
+        else
+        {
+            PKUSER_SHARED_DATA pUserSharedData = (PKUSER_SHARED_DATA)MM_SHARED_USER_DATA_VA;
+            do
+            {
+                Time.HighPart = pUserSharedData->InterruptTime.High1Time;
+                Time.LowPart  = pUserSharedData->InterruptTime.LowPart;
+            } while (pUserSharedData->InterruptTime.High2Time != Time.HighPart);
+        }
+
+        return (uint64_t)Time.QuadPart * 100;
+    }
+
+    return (uint64_t)GetTickCount() * RT_NS_1MS_64;
+
+#else
+# error "Must select a method bright guy!"
+#endif
+}
+
+
+RTDECL(uint64_t) RTTimeSystemNanoTS(void)
+{
+    return rtTimeGetSystemNanoTS();
+}
+
+
+RTDECL(uint64_t) RTTimeSystemMilliTS(void)
+{
+    return rtTimeGetSystemNanoTS() / RT_NS_1MS;
+}
+
+
+RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
+{
+    uint64_t u64;
+    AssertCompile(sizeof(u64) == sizeof(FILETIME));
+    GetSystemTimeAsFileTime((LPFILETIME)&u64);
+    return RTTimeSpecSetNtTime(pTime, u64);
+}
+
+
+RTDECL(PRTTIMESPEC) RTTimeLocalNow(PRTTIMESPEC pTime)
+{
+    uint64_t u64;
+    AssertCompile(sizeof(u64) == sizeof(FILETIME));
+    GetSystemTimeAsFileTime((LPFILETIME)&u64);
+    uint64_t u64Local;
+    if (!FileTimeToLocalFileTime((FILETIME const *)&u64, (LPFILETIME)&u64Local))
+        u64Local = u64;
+    return RTTimeSpecSetNtTime(pTime, u64Local);
+}
+
+
+RTDECL(int64_t) RTTimeLocalDeltaNano(void)
+{
+    /*
+     * UTC = local + Tzi.Bias;
+     * The bias is given in minutes.
+     */
+    TIME_ZONE_INFORMATION Tzi;
+    Tzi.Bias = 0;
+    if (GetTimeZoneInformation(&Tzi) != TIME_ZONE_ID_INVALID)
+        return -(int64_t)Tzi.Bias * 60 * RT_NS_1SEC_64;
+    return 0;
+}
+
diff --git a/src/VBox/Runtime/r3/win/time2-win.cpp b/src/VBox/Runtime/r3/win/time2-win.cpp
new file mode 100644
index 00000000..34af9a45
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/time2-win.cpp
@@ -0,0 +1,154 @@
+/* $Id: time2-win.cpp $ */
+/** @file
+ * IPRT - Time, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#include <iprt/win/windows.h>
+
+#include <iprt/time.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include "internal/time.h"
+
+#include "internal-r3-win.h"
+
+
+RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime)
+{
+    FILETIME    FileTime;
+    SYSTEMTIME  SysTime;
+    if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTime, &FileTime), &SysTime))
+    {
+        if (SetSystemTime(&SysTime))
+            return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
+{
+    RTTIMESPEC LocalTime;
+    if (g_pfnSystemTimeToTzSpecificLocalTime)
+    {
+        /*
+         * FileTimeToLocalFileTime does not do the right thing, so we'll have
+         * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
+         *
+         * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
+         *       we have to do the offUTC calculation using milliseconds and adjust
+         *       u32Nanosecons by sub milliseconds digits.
+         */
+        SYSTEMTIME SystemTimeIn;
+        FILETIME FileTime;
+        if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
+        {
+            SYSTEMTIME SystemTimeOut;
+            if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
+            {
+                if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
+                {
+                    RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
+                    pTime = RTTimeExplode(pTime, &LocalTime);
+                    if (pTime)
+                    {
+                        pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
+                        pTime->offUTC = (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) / RT_MS_1MIN;
+                        pTime->u32Nanosecond += RTTimeSpecGetNano(pTimeSpec) % RT_NS_1MS;
+                    }
+                    return pTime;
+                }
+            }
+        }
+    }
+
+    /*
+     * The fallback is to use the current offset.
+     * (A better fallback would be to use the offset of the same time of the year.)
+     */
+    LocalTime = *pTimeSpec;
+    int64_t cNsUtcOffset = RTTimeLocalDeltaNano();
+    RTTimeSpecAddNano(&LocalTime, cNsUtcOffset);
+    pTime = RTTimeExplode(pTime, &LocalTime);
+    if (pTime)
+    {
+        pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
+        pTime->offUTC = cNsUtcOffset / RT_NS_1MIN;
+    }
+    return pTime;
+}
+
+
+/**
+ * Gets the delta between UTC and local time at the given time.
+ *
+ * @code
+ *      RTTIMESPEC LocalTime;
+ *      RTTimeNow(&LocalTime);
+ *      RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNanoFor(&LocalTime));
+ * @endcode
+ *
+ * @param   pTimeSpec   The time spec giving the time to get the delta for.
+ * @returns Returns the nanosecond delta between UTC and local time.
+ */
+RTDECL(int64_t) RTTimeLocalDeltaNanoFor(PCRTTIMESPEC pTimeSpec)
+{
+    RTTIMESPEC LocalTime;
+    if (g_pfnSystemTimeToTzSpecificLocalTime)
+    {
+        /*
+         * FileTimeToLocalFileTime does not do the right thing, so we'll have
+         * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
+         *
+         * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
+         *       we have to do the offUTC calculation using milliseconds and adjust
+         *       u32Nanosecons by sub milliseconds digits.
+         */
+        SYSTEMTIME SystemTimeIn;
+        FILETIME FileTime;
+        if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
+        {
+            SYSTEMTIME SystemTimeOut;
+            if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
+            {
+                if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
+                {
+                    RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
+
+                    return (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) * RT_NS_1MS;
+                }
+            }
+        }
+    }
+
+    return RTTimeLocalDeltaNano();
+}
+
diff --git a/src/VBox/Runtime/r3/win/timer-win.cpp b/src/VBox/Runtime/r3/win/timer-win.cpp
new file mode 100644
index 00000000..489f208b
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/timer-win.cpp
@@ -0,0 +1,460 @@
+/* $Id: timer-win.cpp $ */
+/** @file
+ * IPRT - Timer.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/* Which code to use is determined here...
+ *
+ * The default is to use wait on NT timers directly with no APC since this
+ * is supposed to give the shortest kernel code paths.
+ *
+ * The USE_APC variation will do as above except that an APC routine is
+ * handling the callback action.
+ *
+ * The USE_WINMM version will use the NT timer wrappers in WinMM which may
+ * result in some 0.1% better correctness in number of delivered ticks. However,
+ * this codepath have more overhead (it uses APC among other things), and I'm not
+ * quite sure if it's actually any more correct.
+ *
+ * The USE_CATCH_UP will play catch up when the timer lags behind. However this
+ * requires a monotonous time source.
+ *
+ * The default mode which we are using is using relative periods of time and thus
+ * will never suffer from errors in the time source. Neither will it try catch up
+ * missed ticks. This suits our current purposes best I'd say.
+ */
+#undef USE_APC
+#undef USE_WINMM
+#undef USE_CATCH_UP
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIMER
+#define _WIN32_WINNT 0x0500
+#include <iprt/win/windows.h>
+
+#include <iprt/timer.h>
+#ifdef USE_CATCH_UP
+# include <iprt/time.h>
+#endif
+#include <iprt/alloc.h>
+#include <iprt/assert.h>
+#include <iprt/thread.h>
+#include <iprt/log.h>
+#include <iprt/asm.h>
+#include <iprt/semaphore.h>
+#include <iprt/err.h>
+#include "internal/magics.h"
+
+RT_C_DECLS_BEGIN
+/* from sysinternals. */
+NTSYSAPI LONG NTAPI NtSetTimerResolution(IN ULONG DesiredResolution, IN BOOLEAN SetResolution, OUT PULONG CurrentResolution);
+NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MaximumResolution, OUT PULONG MinimumResolution, OUT PULONG CurrentResolution);
+RT_C_DECLS_END
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * The internal representation of a timer handle.
+ */
+typedef struct RTTIMER
+{
+    /** Magic.
+     * This is RTTIMER_MAGIC, but changes to something else before the timer
+     * is destroyed to indicate clearly that thread should exit. */
+    volatile uint32_t       u32Magic;
+    /** User argument. */
+    void                   *pvUser;
+    /** Callback. */
+    PFNRTTIMER              pfnTimer;
+    /** The current tick. */
+    uint64_t                iTick;
+    /** The interval. */
+    unsigned                uMilliesInterval;
+#ifdef USE_WINMM
+    /** Win32 timer id. */
+    UINT                    TimerId;
+#else
+    /** Time handle. */
+    HANDLE                  hTimer;
+# ifdef USE_APC
+    /** Handle to wait on. */
+    HANDLE                  hevWait;
+# endif
+    /** USE_CATCH_UP: ns time of the next tick.
+     * !USE_CATCH_UP: -uMilliesInterval * 10000 */
+    LARGE_INTEGER           llNext;
+    /** The thread handle of the timer thread. */
+    RTTHREAD                Thread;
+    /** The error/status of the timer.
+     * Initially -1, set to 0 when the timer have been successfully started, and
+     * to errno on failure in starting the timer. */
+    volatile int            iError;
+#endif
+} RTTIMER;
+
+
+
+#ifdef USE_WINMM
+/**
+ * Win32 callback wrapper.
+ */
+static void CALLBACK rttimerCallback(UINT uTimerID, UINT uMsg, DWORD_PTR dwUser, DWORD_PTR dw1, DWORD_PTR dw2)
+{
+    PRTTIMER pTimer = (PRTTIMER)(void *)dwUser;
+    Assert(pTimer->TimerId == uTimerID);
+    pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pTimer->iTick);
+    NOREF(uMsg); NOREF(dw1); NOREF(dw2); NOREF(uTimerID);
+}
+#else /* !USE_WINMM */
+
+#ifdef USE_APC
+/**
+ * Async callback.
+ *
+ * @param   lpArgToCompletionRoutine    Pointer to our timer structure.
+ */
+VOID CALLBACK rttimerAPCProc(LPVOID lpArgToCompletionRoutine, DWORD dwTimerLowValue, DWORD dwTimerHighValue)
+{
+    PRTTIMER pTimer = (PRTTIMER)lpArgToCompletionRoutine;
+
+    /*
+     * Check if we're begin destroyed.
+     */
+    if (pTimer->u32Magic != RTTIMER_MAGIC)
+        return;
+
+    /*
+     * Callback the handler.
+     */
+    pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pTimer->iTick);
+
+    /*
+     * Rearm the timer handler.
+     */
+#ifdef USE_CATCH_UP
+    pTimer->llNext.QuadPart += (int64_t)pTimer->uMilliesInterval * 10000;
+    LARGE_INTEGER ll;
+    ll.QuadPart = RTTimeNanoTS() - pTimer->llNext.QuadPart;
+    if (ll.QuadPart < -500000)
+        ll.QuadPart = ll.QuadPart / 100;
+    else
+        ll.QuadPart = -500000 / 100; /* need to catch up, do a minimum wait of 0.5ms. */
+#else
+    LARGE_INTEGER ll = pTimer->llNext;
+#endif
+    BOOL frc = SetWaitableTimer(pTimer->hTimer, &ll, 0, rttimerAPCProc, pTimer, FALSE);
+    AssertMsg(frc || pTimer->u32Magic != RTTIMER_MAGIC, ("last error %d\n", GetLastError()));
+}
+#endif /* USE_APC */
+
+/**
+ * Timer thread.
+ */
+static DECLCALLBACK(int) rttimerCallback(RTTHREAD Thread, void *pvArg)
+{
+    PRTTIMER pTimer = (PRTTIMER)(void *)pvArg;
+    Assert(pTimer->u32Magic == RTTIMER_MAGIC);
+
+    /*
+     * Bounce our priority up quite a bit.
+     */
+    if (    !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL)
+        /*&&  !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST)*/)
+    {
+        int rc = GetLastError();
+        AssertMsgFailed(("Failed to set priority class lasterror %d.\n", rc));
+        pTimer->iError = RTErrConvertFromWin32(rc);
+        return rc;
+    }
+
+    /*
+     * Start the waitable timer.
+     */
+
+#ifdef USE_CATCH_UP
+    const int64_t NSInterval = (int64_t)pTimer->uMilliesInterval * 1000000;
+    pTimer->llNext.QuadPart = RTTimeNanoTS() + NSInterval;
+#else
+    pTimer->llNext.QuadPart = -(int64_t)pTimer->uMilliesInterval * 10000;
+#endif
+    LARGE_INTEGER ll;
+    ll.QuadPart = -(int64_t)pTimer->uMilliesInterval * 10000;
+#ifdef USE_APC
+    if (!SetWaitableTimer(pTimer->hTimer, &ll, 0, rttimerAPCProc, pTimer, FALSE))
+#else
+    if (!SetWaitableTimer(pTimer->hTimer, &ll, 0, NULL, NULL, FALSE))
+#endif
+    {
+        int rc = GetLastError();
+        AssertMsgFailed(("Failed to set timer, lasterr %d.\n", rc));
+        pTimer->iError = RTErrConvertFromWin32(rc);
+        RTThreadUserSignal(Thread);
+        return rc;
+    }
+
+    /*
+     * Wait for the semaphore to be posted.
+     */
+    RTThreadUserSignal(Thread);
+    for (;pTimer->u32Magic == RTTIMER_MAGIC;)
+    {
+#ifdef USE_APC
+        int rc = WaitForSingleObjectEx(pTimer->hevWait, INFINITE, TRUE);
+        if (rc != WAIT_OBJECT_0 && rc != WAIT_IO_COMPLETION)
+#else
+        int rc = WaitForSingleObjectEx(pTimer->hTimer, INFINITE, FALSE);
+        if (pTimer->u32Magic != RTTIMER_MAGIC)
+            break;
+        if (rc == WAIT_OBJECT_0)
+        {
+            /*
+             * Callback the handler.
+             */
+            pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pTimer->iTick);
+
+            /*
+             * Rearm the timer handler.
+             */
+# ifdef USE_CATCH_UP
+            pTimer->llNext.QuadPart += NSInterval;
+            LARGE_INTEGER ll;
+            ll.QuadPart = RTTimeNanoTS() - pTimer->llNext.QuadPart;
+            if (ll.QuadPart < -500000)
+                ll.QuadPart = ll.QuadPart / 100;
+            else
+                ll.QuadPart = -500000 / 100; /* need to catch up, do a minimum wait of 0.5ms. */
+# else
+            LARGE_INTEGER ll = pTimer->llNext;
+# endif
+            BOOL fRc = SetWaitableTimer(pTimer->hTimer, &ll, 0, NULL, NULL, FALSE);
+            AssertMsg(fRc || pTimer->u32Magic != RTTIMER_MAGIC, ("last error %d\n", GetLastError())); NOREF(fRc);
+        }
+        else
+#endif
+        {
+            /*
+             * We failed during wait, so just signal the destructor and exit.
+             */
+            int rc2 = GetLastError();
+            RTThreadUserSignal(Thread);
+            AssertMsgFailed(("Wait on hTimer failed, rc=%d lasterr=%d\n", rc, rc2)); NOREF(rc2);
+            return -1;
+        }
+    }
+
+    /*
+     * Exit.
+     */
+    RTThreadUserSignal(Thread);
+    return 0;
+}
+#endif /* !USE_WINMM */
+
+
+RTDECL(int) RTTimerCreate(PRTTIMER *ppTimer, unsigned uMilliesInterval, PFNRTTIMER pfnTimer, void *pvUser)
+{
+#ifndef USE_WINMM
+    /*
+     * On windows we'll have to set the timer resolution before
+     * we start the timer.
+     */
+    ULONG ulMax = UINT32_MAX;
+    ULONG ulMin = UINT32_MAX;
+    ULONG ulCur = UINT32_MAX;
+    NtQueryTimerResolution(&ulMax, &ulMin, &ulCur);
+    Log(("NtQueryTimerResolution -> ulMax=%lu00ns ulMin=%lu00ns ulCur=%lu00ns\n", ulMax, ulMin, ulCur));
+    if (ulCur > ulMin && ulCur > 10000 /* = 1ms */)
+    {
+        if (NtSetTimerResolution(10000, TRUE, &ulCur) >= 0)
+            Log(("Changed timer resolution to 1ms.\n"));
+        else if (NtSetTimerResolution(20000, TRUE, &ulCur) >= 0)
+            Log(("Changed timer resolution to 2ms.\n"));
+        else if (NtSetTimerResolution(40000, TRUE, &ulCur) >= 0)
+            Log(("Changed timer resolution to 4ms.\n"));
+        else if (ulMin <= 50000 && NtSetTimerResolution(ulMin, TRUE, &ulCur) >= 0)
+            Log(("Changed timer resolution to %lu *100ns.\n", ulMin));
+        else
+        {
+            AssertMsgFailed(("Failed to configure timer resolution!\n"));
+            return VERR_INTERNAL_ERROR;
+        }
+    }
+#endif /* !USE_WINN */
+
+    /*
+     * Create new timer.
+     */
+    int rc = VERR_IPE_UNINITIALIZED_STATUS;
+    PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
+    if (pTimer)
+    {
+        pTimer->u32Magic    = RTTIMER_MAGIC;
+        pTimer->pvUser      = pvUser;
+        pTimer->pfnTimer    = pfnTimer;
+        pTimer->iTick       = 0;
+        pTimer->uMilliesInterval = uMilliesInterval;
+#ifdef USE_WINMM
+        /* sync kill doesn't work. */
+        pTimer->TimerId     = timeSetEvent(uMilliesInterval, 0, rttimerCallback, (DWORD_PTR)pTimer, TIME_PERIODIC | TIME_CALLBACK_FUNCTION);
+        if (pTimer->TimerId)
+        {
+            ULONG ulMax = UINT32_MAX;
+            ULONG ulMin = UINT32_MAX;
+            ULONG ulCur = UINT32_MAX;
+            NtQueryTimerResolution(&ulMax, &ulMin, &ulCur);
+            Log(("NtQueryTimerResolution -> ulMax=%lu00ns ulMin=%lu00ns ulCur=%lu00ns\n", ulMax, ulMin, ulCur));
+
+            *ppTimer = pTimer;
+            return VINF_SUCCESS;
+        }
+        rc = VERR_INVALID_PARAMETER;
+
+#else /* !USE_WINMM */
+
+        /*
+         * Create Win32 event semaphore.
+         */
+        pTimer->iError = 0;
+        pTimer->hTimer = CreateWaitableTimer(NULL, TRUE, NULL);
+        if (pTimer->hTimer)
+        {
+#ifdef USE_APC
+            /*
+             * Create wait semaphore.
+             */
+            pTimer->hevWait = CreateEvent(NULL, FALSE, FALSE, NULL);
+            if (pTimer->hevWait)
+#endif
+            {
+                /*
+                 * Kick off the timer thread.
+                 */
+                rc = RTThreadCreate(&pTimer->Thread, rttimerCallback, pTimer, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "Timer");
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Wait for the timer to successfully create the timer
+                     * If we don't get a response in 10 secs, then we assume we're screwed.
+                     */
+                    rc = RTThreadUserWait(pTimer->Thread, 10000);
+                    if (RT_SUCCESS(rc))
+                    {
+                        rc = pTimer->iError;
+                        if (RT_SUCCESS(rc))
+                        {
+                            *ppTimer = pTimer;
+                            return VINF_SUCCESS;
+                        }
+                    }
+                    ASMAtomicXchgU32(&pTimer->u32Magic, RTTIMER_MAGIC + 1);
+                    RTThreadWait(pTimer->Thread, 250, NULL);
+                    CancelWaitableTimer(pTimer->hTimer);
+                }
+#ifdef USE_APC
+                CloseHandle(pTimer->hevWait);
+#endif
+            }
+            CloseHandle(pTimer->hTimer);
+        }
+#endif /* !USE_WINMM */
+
+        AssertMsgFailed(("Failed to create timer uMilliesInterval=%d. rc=%d\n", uMilliesInterval, rc));
+        RTMemFree(pTimer);
+    }
+    else
+        rc = VERR_NO_MEMORY;
+    return rc;
+}
+
+
+RTR3DECL(int)     RTTimerDestroy(PRTTIMER pTimer)
+{
+    /* NULL is ok. */
+    if (!pTimer)
+        return VINF_SUCCESS;
+
+    /*
+     * Validate handle first.
+     */
+    int rc;
+    if (    VALID_PTR(pTimer)
+        &&  pTimer->u32Magic == RTTIMER_MAGIC)
+    {
+#ifdef USE_WINMM
+        /*
+         * Kill the timer and exit.
+         */
+        rc = timeKillEvent(pTimer->TimerId);
+        AssertMsg(rc == TIMERR_NOERROR, ("timeKillEvent -> %d\n", rc));
+        ASMAtomicXchgU32(&pTimer->u32Magic, RTTIMER_MAGIC + 1);
+        RTThreadSleep(1);
+
+#else /* !USE_WINMM */
+
+        /*
+         * Signal that we want the thread to exit.
+         */
+        ASMAtomicXchgU32(&pTimer->u32Magic, RTTIMER_MAGIC + 1);
+#ifdef USE_APC
+        SetEvent(pTimer->hevWait);
+        CloseHandle(pTimer->hevWait);
+        rc = CancelWaitableTimer(pTimer->hTimer);
+        AssertMsg(rc, ("CancelWaitableTimer lasterr=%d\n", GetLastError()));
+#else
+        LARGE_INTEGER ll = {0};
+        ll.LowPart = 100;
+        rc = SetWaitableTimer(pTimer->hTimer, &ll, 0, NULL, NULL, FALSE);
+        AssertMsg(rc, ("CancelWaitableTimer lasterr=%d\n", GetLastError()));
+#endif
+
+        /*
+         * Wait for the thread to exit.
+         * And if it don't wanna exit, we'll get kill it.
+         */
+        rc = RTThreadWait(pTimer->Thread, 1000, NULL);
+        if (RT_FAILURE(rc))
+            TerminateThread((HANDLE)RTThreadGetNative(pTimer->Thread), UINT32_MAX);
+
+        /*
+         * Free resource.
+         */
+        rc = CloseHandle(pTimer->hTimer);
+        AssertMsg(rc, ("CloseHandle lasterr=%d\n", GetLastError()));
+
+#endif /* !USE_WINMM */
+        RTMemFree(pTimer);
+        return rc;
+    }
+
+    rc = VERR_INVALID_HANDLE;
+    AssertMsgFailed(("Failed to destroy timer %p. rc=%d\n", pTimer, rc));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/tls-win.cpp b/src/VBox/Runtime/r3/win/tls-win.cpp
new file mode 100644
index 00000000..b1a196ff
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/tls-win.cpp
@@ -0,0 +1,220 @@
+/* $Id: tls-win.cpp $ */
+/** @file
+ * IPRT - Thread Local Storage (TLS), Win32.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_THREAD
+#include <iprt/win/windows.h>
+
+#include <iprt/thread.h>
+#include <iprt/assert.h>
+#include <iprt/critsect.h>
+#include <iprt/errcore.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/once.h>
+#include "internal/thread.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef struct RTTLSWINDTOR
+{
+    RTLISTNODE      ListEntry;
+    DWORD           iTls;
+    PFNRTTLSDTOR    pfnDestructor;
+} RTTLSWINDTOR;
+typedef RTTLSWINDTOR *PRTTLSWINDTOR;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Init once for the list and critical section. */
+static RTONCE               g_Once = RTONCE_INITIALIZER;
+/** Critical section protecting the TLS destructor list. */
+static RTCRITSECTRW         g_CritSect;
+/** List of TLS destrictors (RTTLSWINDTOR).  */
+static RTLISTANCHOR         g_TlsDtorHead;
+/** Number of desturctors in the list (helps putting of initialization). */
+static uint32_t volatile    g_cTlsDtors = 0;
+
+
+/**
+ * @callback_method_impl{FNRTONCE}
+ */
+static DECLCALLBACK(int32_t) rtTlsWinInitLock(void *pvUser)
+{
+    RT_NOREF(pvUser);
+    RTListInit(&g_TlsDtorHead);
+    return RTCritSectRwInit(&g_CritSect);
+}
+
+
+RTR3DECL(RTTLS) RTTlsAlloc(void)
+{
+    AssertCompile(sizeof(RTTLS) >= sizeof(DWORD));
+    DWORD iTls = TlsAlloc();
+    return iTls != TLS_OUT_OF_INDEXES ? (RTTLS)iTls : NIL_RTTLS;
+}
+
+
+RTR3DECL(int) RTTlsAllocEx(PRTTLS piTls, PFNRTTLSDTOR pfnDestructor)
+{
+    int rc;
+    if (!pfnDestructor)
+    {
+        DWORD iTls = TlsAlloc();
+        if (iTls != TLS_OUT_OF_INDEXES)
+        {
+            Assert((RTTLS)iTls != NIL_RTTLS);
+            *piTls = (RTTLS)iTls;
+            Assert((DWORD)*piTls == iTls);
+            rc = VINF_SUCCESS;
+        }
+        else
+            rc = VERR_NO_MEMORY;
+    }
+    else
+    {
+        rc = RTOnce(&g_Once, rtTlsWinInitLock, NULL);
+        if (RT_SUCCESS(rc))
+        {
+            PRTTLSWINDTOR pDtor = (PRTTLSWINDTOR)RTMemAlloc(sizeof(*pDtor));
+            if (pDtor)
+            {
+                DWORD iTls = TlsAlloc();
+                if (iTls != TLS_OUT_OF_INDEXES)
+                {
+                    Assert((RTTLS)iTls != NIL_RTTLS);
+                    *piTls = (RTTLS)iTls;
+                    Assert((DWORD)*piTls == iTls);
+
+                    /*
+                     * Add the destructor to the list.  We keep it sorted.
+                     */
+                    pDtor->iTls = iTls;
+                    pDtor->pfnDestructor = pfnDestructor;
+                    RTCritSectRwEnterExcl(&g_CritSect);
+                    RTListAppend(&g_TlsDtorHead, &pDtor->ListEntry);
+                    ASMAtomicIncU32(&g_cTlsDtors);
+                    RTCritSectRwLeaveExcl(&g_CritSect);
+
+                    rc = VINF_SUCCESS;
+                }
+                else
+                    rc = VERR_NO_MEMORY;
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+    }
+    return rc;
+}
+
+
+RTR3DECL(int) RTTlsFree(RTTLS iTls)
+{
+    if (iTls == NIL_RTTLS)
+        return VINF_SUCCESS;
+    if (TlsFree((DWORD)iTls))
+    {
+        if (ASMAtomicReadU32(&g_cTlsDtors) > 0)
+        {
+            RTCritSectRwEnterExcl(&g_CritSect);
+            PRTTLSWINDTOR pDtor;
+            RTListForEach(&g_TlsDtorHead, pDtor, RTTLSWINDTOR, ListEntry)
+            {
+                if (pDtor->iTls == (DWORD)iTls)
+                {
+                    RTListNodeRemove(&pDtor->ListEntry);
+                    ASMAtomicDecU32(&g_cTlsDtors);
+                    RTMemFree(pDtor);
+                    break;
+                }
+            }
+            RTCritSectRwLeaveExcl(&g_CritSect);
+        }
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(void *) RTTlsGet(RTTLS iTls)
+{
+    return TlsGetValue((DWORD)iTls);
+}
+
+
+RTR3DECL(int) RTTlsGetEx(RTTLS iTls, void **ppvValue)
+{
+    void *pv = TlsGetValue((DWORD)iTls);
+    if (pv)
+    {
+        *ppvValue = pv;
+        return VINF_SUCCESS;
+    }
+
+    /* TlsGetValue always updates last error */
+    *ppvValue = NULL;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(int) RTTlsSet(RTTLS iTls, void *pvValue)
+{
+    if (TlsSetValue((DWORD)iTls, pvValue))
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+/**
+ * Called by dllmain-win.cpp when a thread detaches.
+ */
+DECLHIDDEN(void) rtThreadWinTlsDestruction(void)
+{
+    if (ASMAtomicReadU32(&g_cTlsDtors) > 0)
+    {
+        RTCritSectRwEnterShared(&g_CritSect);
+        PRTTLSWINDTOR pDtor;
+        RTListForEach(&g_TlsDtorHead, pDtor, RTTLSWINDTOR, ListEntry)
+        {
+            void *pvValue = TlsGetValue(pDtor->iTls);
+            if (pvValue != NULL)
+            {
+                pDtor->pfnDestructor(pvValue);
+                TlsSetValue(pDtor->iTls, NULL);
+            }
+        }
+        RTCritSectRwLeaveShared(&g_CritSect);
+    }
+}
+
diff --git a/src/VBox/Runtime/r3/win/utf16locale-win.cpp b/src/VBox/Runtime/r3/win/utf16locale-win.cpp
new file mode 100644
index 00000000..e71f0dfd
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/utf16locale-win.cpp
@@ -0,0 +1,48 @@
+/* $Id: utf16locale-win.cpp $ */
+/** @file
+ * IPRT - UTF-16 Locale Specific Manipulation, Win32.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_UTF16
+#include <iprt/win/windows.h>
+
+#include <iprt/utf16.h>
+
+
+RTDECL(int) RTUtf16LocaleICmp(PCRTUTF16 pusz1, PCRTUTF16 pusz2)
+{
+    if (pusz1 == pusz2)
+        return 0;
+    if (pusz1 == NULL)
+        return -1;
+    if (pusz2 == NULL)
+        return 1;
+
+    return CompareStringW(LOCALE_USER_DEFAULT, NORM_IGNORECASE, pusz1, -1, pusz2, -1) - 2;
+}
+
diff --git a/src/VBox/Runtime/r3/win/utf8-win.cpp b/src/VBox/Runtime/r3/win/utf8-win.cpp
new file mode 100644
index 00000000..344de4e1
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/utf8-win.cpp
@@ -0,0 +1,179 @@
+/* $Id: utf8-win.cpp $ */
+/** @file
+ * IPRT - UTF8 helpers.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_UTF8
+#include <iprt/win/windows.h>
+
+#include <iprt/string.h>
+#include <iprt/alloc.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/utf16.h>
+
+
+
+RTR3DECL(int)  RTStrUtf8ToCurrentCPTag(char **ppszString, const char *pszString, const char *pszTag)
+{
+    return RTStrUtf8ToCurrentCPExTag(ppszString, pszString, RTSTR_MAX, pszTag);
+}
+
+
+RTR3DECL(int)  RTStrUtf8ToCurrentCPExTag(char **ppszString, const char *pszString, size_t cchString, const char *pszTag)
+{
+    Assert(ppszString);
+    Assert(pszString);
+
+    /*
+     * Check for zero length input string.
+     */
+    if (cchString < 1 || !*pszString)
+    {
+        *ppszString = (char *)RTMemTmpAllocZTag(sizeof(char), pszTag);
+        if (*ppszString)
+            return VINF_SUCCESS;
+        return VERR_NO_TMP_MEMORY;
+    }
+
+    *ppszString = NULL;
+
+    /*
+     * Convert to wide char first.
+     */
+    PRTUTF16 pwszString = NULL;
+    int rc = RTStrToUtf16Ex(pszString, cchString, &pwszString, 0, NULL);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * First calc result string length.
+     */
+    int cbResult = WideCharToMultiByte(CP_ACP, 0, pwszString, -1, NULL, 0, NULL, NULL);
+    if (cbResult > 0)
+    {
+        /*
+         * Alloc space for result buffer.
+         */
+        LPSTR lpString = (LPSTR)RTMemTmpAllocTag(cbResult, pszTag);
+        if (lpString)
+        {
+            /*
+             * Do the translation.
+             */
+            if (WideCharToMultiByte(CP_ACP, 0, pwszString, -1, lpString, cbResult, NULL, NULL) > 0)
+            {
+                /* ok */
+                *ppszString = lpString;
+                RTMemTmpFree(pwszString);
+                return VINF_SUCCESS;
+            }
+
+            /* translation error */
+            int iLastErr = GetLastError();
+            AssertMsgFailed(("Unicode to ACP translation failed. lasterr=%d\n", iLastErr));
+            rc = RTErrConvertFromWin32(iLastErr);
+        }
+        else
+            rc = VERR_NO_TMP_MEMORY;
+        RTMemTmpFree(lpString);
+    }
+    else
+    {
+        /* translation error */
+        int iLastErr = GetLastError();
+        AssertMsgFailed(("Unicode to ACP translation failed lasterr=%d\n", iLastErr));
+        rc = RTErrConvertFromWin32(iLastErr);
+    }
+    RTMemTmpFree(pwszString);
+    return rc;
+}
+
+
+RTR3DECL(int)  RTStrCurrentCPToUtf8Tag(char **ppszString, const char *pszString, const char *pszTag)
+{
+    Assert(ppszString);
+    Assert(pszString);
+    *ppszString = NULL;
+
+    /** @todo is there a quicker way? Currently: ACP -> UTF-16 -> UTF-8 */
+
+    size_t cch = strlen(pszString);
+    if (cch <= 0)
+    {
+        /* zero length string passed. */
+        *ppszString = (char *)RTMemTmpAllocZTag(sizeof(char), pszTag);
+        if (*ppszString)
+            return VINF_SUCCESS;
+        return VERR_NO_TMP_MEMORY;
+    }
+
+    /*
+     * First calc result string length.
+     */
+    int rc;
+    int cwc = MultiByteToWideChar(CP_ACP, 0, pszString, -1, NULL, 0);
+    if (cwc > 0)
+    {
+        /*
+         * Alloc space for result buffer.
+         */
+        PRTUTF16 pwszString = (PRTUTF16)RTMemTmpAlloc(cwc * sizeof(RTUTF16));
+        if (pwszString)
+        {
+            /*
+             * Do the translation.
+             */
+            if (MultiByteToWideChar(CP_ACP, 0, pszString, -1, pwszString, cwc) > 0)
+            {
+                /*
+                 * Now we got UTF-16, convert it to UTF-8
+                 */
+                rc = RTUtf16ToUtf8(pwszString, ppszString);
+                RTMemTmpFree(pwszString);
+                return rc;
+            }
+            RTMemTmpFree(pwszString);
+            /* translation error */
+            int iLastErr = GetLastError();
+            AssertMsgFailed(("ACP to Unicode translation failed. lasterr=%d\n", iLastErr));
+            rc = RTErrConvertFromWin32(iLastErr);
+        }
+        else
+            rc = VERR_NO_TMP_MEMORY;
+    }
+    else
+    {
+        /* translation error */
+        int iLastErr = GetLastError();
+        AssertMsgFailed(("Unicode to ACP translation failed lasterr=%d\n", iLastErr));
+        rc = RTErrConvertFromWin32(iLastErr);
+    }
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/win/uuid-win.cpp b/src/VBox/Runtime/r3/win/uuid-win.cpp
new file mode 100644
index 00000000..811c8cdf
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/uuid-win.cpp
@@ -0,0 +1,185 @@
+/* $Id: uuid-win.cpp $ */
+/** @file
+ * IPRT - UUID, Windows implementation.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_UUID
+#include <iprt/win/windows.h>
+
+#include <iprt/uuid.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/errcore.h>
+
+
+RTDECL(int)  RTUuidClear(PRTUUID pUuid)
+{
+    /* check params */
+    AssertPtrReturn(pUuid, VERR_INVALID_POINTER);
+
+    return RTErrConvertFromWin32(UuidCreateNil((UUID *)pUuid));
+}
+
+
+RTDECL(bool)  RTUuidIsNull(PCRTUUID pUuid)
+{
+    /* check params */
+    AssertPtrReturn(pUuid, true);
+
+    RPC_STATUS status;
+    return !!UuidIsNil((UUID *)pUuid, &status);
+}
+
+
+RTDECL(int)  RTUuidCompare(PCRTUUID pUuid1, PCRTUUID pUuid2)
+{
+    /*
+     * Special cases.
+     */
+    if (pUuid1 == pUuid2)
+        return 0;
+    if (!pUuid1)
+        return RTUuidIsNull(pUuid2) ? 0 : -1;
+    if (!pUuid2)
+        return RTUuidIsNull(pUuid1) ? 0 : 1;
+    AssertPtrReturn(pUuid1, -1);
+    AssertPtrReturn(pUuid2, 1);
+
+    /*
+     * Hand the rest to the Windows API.
+     */
+    RPC_STATUS status;
+    return UuidCompare((UUID *)pUuid1, (UUID *)pUuid2, &status);
+}
+
+
+RTDECL(int)  RTUuidCompareStr(PCRTUUID pUuid1, const char *pszString2)
+{
+    /* check params */
+    AssertPtrReturn(pUuid1, -1);
+    AssertPtrReturn(pszString2, 1);
+
+    /*
+     * Try convert the string to a UUID and then compare the two.
+     */
+    RTUUID Uuid2;
+    int rc = RTUuidFromStr(&Uuid2, pszString2);
+    AssertRCReturn(rc, 1);
+
+    return RTUuidCompare(pUuid1, &Uuid2);
+}
+
+
+RTDECL(int)  RTUuidCompare2Strs(const char *pszString1, const char *pszString2)
+{
+    RTUUID Uuid1;
+    RTUUID Uuid2;
+    int rc;
+
+    /* check params */
+    AssertPtrReturn(pszString1, -1);
+    AssertPtrReturn(pszString2, 1);
+
+    /*
+     * Try convert the strings to UUIDs and then compare them.
+     */
+    rc = RTUuidFromStr(&Uuid1, pszString1);
+    AssertRCReturn(rc, -1);
+
+    rc = RTUuidFromStr(&Uuid2, pszString2);
+    AssertRCReturn(rc, 1);
+
+    return RTUuidCompare(&Uuid1, &Uuid2);
+}
+
+
+RTDECL(int)  RTUuidToStr(PCRTUUID pUuid, char *pszString, size_t cchString)
+{
+    /* check params */
+    AssertPtrReturn(pUuid, VERR_INVALID_POINTER);
+    AssertPtrReturn(pszString, VERR_INVALID_POINTER);
+    AssertReturn(cchString >= RTUUID_STR_LENGTH, VERR_INVALID_PARAMETER);
+
+    /*
+     * Try convert it.
+     *
+     * The API allocates a new string buffer for us, so we can do our own
+     * buffer overflow handling.
+     */
+    RPC_STATUS Status;
+    unsigned char *pszTmpStr = NULL;
+#ifdef RPC_UNICODE_SUPPORTED
+    /* always use ASCII version! */
+    Status = UuidToStringA((UUID *)pUuid, &pszTmpStr);
+#else
+    Status = UuidToString((UUID *)pUuid, &pszTmpStr);
+#endif
+    if (Status != RPC_S_OK)
+        return RTErrConvertFromWin32(Status);
+
+    /* copy it. */
+    int rc = VINF_SUCCESS;
+    size_t cchTmpStr = strlen((char *)pszTmpStr);
+    if (cchTmpStr < cchString)
+        memcpy(pszString, pszTmpStr, cchTmpStr + 1);
+    else
+    {
+        AssertFailed();
+        rc = ERROR_BUFFER_OVERFLOW;
+    }
+
+    /* free buffer */
+#ifdef RPC_UNICODE_SUPPORTED
+    /* always use ASCII version! */
+    RpcStringFreeA(&pszTmpStr);
+#else
+    RpcStringFree(&pszTmpStr);
+#endif
+
+    /* all done */
+    return rc;
+}
+
+
+RTDECL(int)  RTUuidFromStr(PRTUUID pUuid, const char *pszString)
+{
+    /* check params */
+    AssertPtrReturn(pUuid, VERR_INVALID_POINTER);
+    AssertPtrReturn(pszString, VERR_INVALID_POINTER);
+
+    RPC_STATUS rc;
+#ifdef RPC_UNICODE_SUPPORTED
+    /* always use ASCII version! */
+    rc = UuidFromStringA((unsigned char *)pszString, (UUID *)pUuid);
+#else
+    rc = UuidFromString((unsigned char *)pszString, (UUID *)pUuid);
+#endif
+
+    return RTErrConvertFromWin32(rc);
+}
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-fakes.h b/src/VBox/Runtime/r3/win/vcc100-fakes.h
new file mode 100644
index 00000000..5f84e95a
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-fakes.h
@@ -0,0 +1,131 @@
+/* $Id: vcc100-fakes.h $ */
+/** @file
+ * IPRT - Common macros for the Visual C++ 2010+ CRT import fakes.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r3_win_vcc100_fakes_h
+#define IPRT_INCLUDED_SRC_r3_win_vcc100_fakes_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#ifdef RT_STRICT
+# include <stdio.h> /* _snprintf */
+#endif
+
+
+/** @def MY_ASSERT
+ * We use a special assertion macro here to avoid dragging in IPRT bits in
+ * places which cannot handle it (direct GA 3D bits or something like that).
+ *
+ * Turns out snprintf is off limits too.  Needs Locale info and runs out of
+ * stack
+ */
+#ifdef RT_STRICT
+# if 1
+#  define MY_ASSERT(a_Expr, g_szMsg) \
+    do { \
+        if ((a_Expr)) \
+        { /*likely*/ } \
+        else \
+        { \
+            OutputDebugStringA("Assertion failed on line " RT_XSTR(__LINE__) ": " RT_XSTR(a_Expr) "\n"); \
+            OutputDebugStringA("Assertion message: " g_szMsg "\n"); \
+            RT_BREAKPOINT(); \
+        } \
+    } while (0)
+# else
+#  define MY_ASSERT(a_Expr, ...) \
+    do { \
+        if ((a_Expr)) \
+        { /*likely*/ } \
+        else \
+        { \
+            char szTmp[256]; \
+            _snprintf(szTmp, sizeof(szTmp), "Assertion failed on line %u in '%s': %s", __LINE__, __PRETTY_FUNCTION__, #a_Expr); \
+            OutputDebugStringA(szTmp); \
+            _snprintf(szTmp, sizeof(szTmp), __VA_ARGS__); \
+            OutputDebugStringA(szTmp); \
+            RT_BREAKPOINT(); \
+        } \
+    } while (0)
+# endif
+#else
+# define MY_ASSERT(a_Expr, ...) do { } while (0)
+#endif
+
+
+/** Dynamically resolves an NTDLL API we need.   */
+#define RESOLVE_NTDLL_API(ApiNm) \
+    static bool volatile    s_fInitialized##ApiNm = false; \
+    static decltype(ApiNm) *s_pfn##ApiNm = NULL; \
+    decltype(ApiNm)        *pfn##ApiNm; \
+    if (s_fInitialized##ApiNm) \
+        pfn##ApiNm = s_pfn##ApiNm; \
+    else \
+    { \
+        pfn##ApiNm = (decltype(pfn##ApiNm))GetProcAddress(GetModuleHandleW(L"ntdll"), #ApiNm); \
+        s_pfn##ApiNm = pfn##ApiNm; \
+        s_fInitialized##ApiNm = true; \
+    } do {} while (0)
+
+
+/** Declare a kernel32 API.
+ * @note We are not exporting them as that causes duplicate symbol troubles in
+ *       the OpenGL bits. */
+#define DECL_KERNEL32(a_Type) extern "C" a_Type WINAPI
+
+
+/** Ignore comments. */
+#define COMMENT(a_Text)
+
+/** Used for MAKE_IMPORT_ENTRY when declaring external g_pfnXxxx variables. */
+#define DECLARE_FUNCTION_POINTER(a_Name, a_cb) extern "C" decltype(a_Name) *RT_CONCAT(g_pfn, a_Name);
+
+/** Used in the InitFakes method to decl are uCurVersion used by assertion. */
+#ifdef RT_STRICT
+# define CURRENT_VERSION_VARIABLE() \
+    unsigned uCurVersion = GetVersion(); \
+    uCurVersion = ((uCurVersion & 0xff) << 8) | ((uCurVersion >> 8) & 0xff)
+#else
+# define CURRENT_VERSION_VARIABLE() (void)0
+#endif
+
+
+/** Used for MAKE_IMPORT_ENTRY when resolving an import. */
+#define RESOLVE_IMPORT(a_uMajorVer, a_uMinorVer, a_Name, a_cb) \
+    do { \
+        FARPROC pfnApi = GetProcAddress(hmod, #a_Name); \
+        if (pfnApi) \
+            RT_CONCAT(g_pfn, a_Name) = (decltype(a_Name) *)pfnApi; \
+        else \
+        { \
+            MY_ASSERT(uCurVersion < (((a_uMajorVer) << 8) | (a_uMinorVer)), #a_Name); \
+            RT_CONCAT(g_pfn, a_Name) = RT_CONCAT(Fake_,a_Name); \
+        } \
+    } while (0);
+
+
+#endif /* !IPRT_INCLUDED_SRC_r3_win_vcc100_fakes_h */
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-fakes.mac b/src/VBox/Runtime/r3/win/vcc100-fakes.mac
new file mode 100644
index 00000000..cdcb6ed1
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-fakes.mac
@@ -0,0 +1,66 @@
+; $Id: vcc100-fakes.mac $
+;; @file
+; IPRT - Common macros for the Visual C++ 2010+ CRT import fakes.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+
+%include "iprt/asmdefs.mac"
+
+%ifndef RT_ARCH_X86
+ %error "This is x86 only code.
+%endif
+
+
+;;
+; Fakes an API import table entry.
+;
+; @param 1  The function name
+; @param 2  Number of bytes of parameters for x86.
+%macro MAKE_IMPORT_ENTRY_INTERNAL 2
+
+BEGINDATA
+extern _FakeResolve_ %+ FAKE_MODULE_NAME
+
+extern _Fake_ %+ %1 %+ @ %+ %2
+global __imp__ %+ %1 %+ @ %+ %2         ; The import address table (IAT) entry name.
+__imp__ %+ %1 %+ @ %+ %2:
+global _g_pfn %+ %1                     ; C accessible label.
+_g_pfn %+ %1:
+        dd      FakeLazyInit_ %+ %1
+
+BEGINCODE
+FakeLazyInit_ %+ %1:
+        pusha
+        call    _FakeResolve_ %+ FAKE_MODULE_NAME
+        popa
+global _ %+ %1 %+ @ %+ %2               ; The imported function stub.
+_ %+ %1 %+ @ %+ %2:
+        jmp     [_g_pfn %+ %1]
+
+
+%endmacro
+
+%define MAKE_IMPORT_ENTRY(a_uMajorVer, a_uMinorVer, a_Name, a_cbParams) MAKE_IMPORT_ENTRY_INTERNAL a_Name, a_cbParams
+%define COMMENT(a_Text)
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-kernel32-fakes.cpp b/src/VBox/Runtime/r3/win/vcc100-kernel32-fakes.cpp
new file mode 100644
index 00000000..65248afa
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-kernel32-fakes.cpp
@@ -0,0 +1,647 @@
+/* $Id: vcc100-kernel32-fakes.cpp $ */
+/** @file
+ * IPRT - Tricks to make the Visual C++ 2010 CRT work on NT4, W2K and XP.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#ifdef DEBUG
+# include <stdio.h> /* _snprintf */
+#endif
+
+#ifndef RT_ARCH_X86
+# error "This code is X86 only"
+#endif
+
+#include <iprt/nt/nt-and-windows.h>
+
+#include "vcc100-fakes.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#ifndef HEAP_STANDARD
+# define HEAP_STANDARD 0
+#endif
+
+
+/** Declare a kernel32 API.
+ * @note We are not exporting them as that causes duplicate symbol troubles in
+ *       the OpenGL bits. */
+#define DECL_KERNEL32(a_Type) extern "C" a_Type WINAPI
+
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static volatile bool g_fInitialized = false;
+#define MAKE_IMPORT_ENTRY(a_uMajorVer, a_uMinorVer, a_Name, a_cb) DECLARE_FUNCTION_POINTER(a_Name, a_cb)
+#include "vcc100-kernel32-fakes.h"
+
+
+
+DECL_KERNEL32(PVOID) Fake_DecodePointer(PVOID pvEncoded)
+{
+    return pvEncoded;
+}
+
+
+DECL_KERNEL32(PVOID) Fake_EncodePointer(PVOID pvNative)
+{
+    return pvNative;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_InitializeCriticalSectionAndSpinCount(LPCRITICAL_SECTION pCritSect, DWORD cSpin)
+{
+    RT_NOREF(cSpin);
+    InitializeCriticalSection(pCritSect);
+    return TRUE;
+}
+
+
+DECL_KERNEL32(HANDLE) Fake_CreateIoCompletionPort(HANDLE hFile, HANDLE hExistingCompletionPort, ULONG_PTR uCompletionKey,
+                                                  DWORD cConcurrentThreads)
+{
+    RT_NOREF(hFile, hExistingCompletionPort, uCompletionKey, cConcurrentThreads);
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return NULL;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_GetQueuedCompletionStatus(HANDLE hCompletionPort, PDWORD_PTR pcbTransfered, PULONG_PTR puCompletionKey,
+                                                   LPOVERLAPPED *ppOverlapped, DWORD cMs)
+{
+    RT_NOREF(hCompletionPort, pcbTransfered, puCompletionKey, ppOverlapped, cMs);
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_PostQueuedCompletionStatus(HANDLE hCompletionPort, DWORD cbTransfered, ULONG_PTR uCompletionKey,
+                                                    LPOVERLAPPED pOverlapped)
+{
+    RT_NOREF(hCompletionPort, cbTransfered, uCompletionKey, pOverlapped);
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_HeapSetInformation(HANDLE hHeap, HEAP_INFORMATION_CLASS enmInfoClass, PVOID pvBuf, SIZE_T cbBuf)
+{
+    RT_NOREF(hHeap);
+    if (enmInfoClass == HeapCompatibilityInformation)
+    {
+        if (   cbBuf != sizeof(ULONG)
+            || !pvBuf
+            || *(PULONG)pvBuf == HEAP_STANDARD
+           )
+        {
+            SetLastError(ERROR_INVALID_PARAMETER);
+            return FALSE;
+        }
+        return TRUE;
+    }
+
+    SetLastError(ERROR_INVALID_PARAMETER);
+    return FALSE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_HeapQueryInformation(HANDLE hHeap, HEAP_INFORMATION_CLASS enmInfoClass,
+                                              PVOID pvBuf, SIZE_T cbBuf, PSIZE_T pcbRet)
+{
+    RT_NOREF(hHeap);
+    if (enmInfoClass == HeapCompatibilityInformation)
+    {
+        *pcbRet = sizeof(ULONG);
+        if (cbBuf < sizeof(ULONG) || !pvBuf)
+        {
+            SetLastError(ERROR_INSUFFICIENT_BUFFER);
+            return FALSE;
+        }
+        *(PULONG)pvBuf = HEAP_STANDARD;
+        return TRUE;
+    }
+
+    SetLastError(ERROR_INVALID_PARAMETER);
+    return FALSE;
+}
+
+
+/* These are used by INTEL\mt_obj\Timer.obj: */
+
+DECL_KERNEL32(HANDLE) Fake_CreateTimerQueue(void)
+{
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return NULL;
+}
+
+DECL_KERNEL32(BOOL) Fake_CreateTimerQueueTimer(PHANDLE phTimer, HANDLE hTimerQueue, WAITORTIMERCALLBACK pfnCallback, PVOID pvUser,
+                                               DWORD msDueTime, DWORD msPeriod, ULONG fFlags)
+{
+    NOREF(phTimer); NOREF(hTimerQueue); NOREF(pfnCallback); NOREF(pvUser); NOREF(msDueTime); NOREF(msPeriod); NOREF(fFlags);
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+DECL_KERNEL32(BOOL) Fake_DeleteTimerQueueTimer(HANDLE hTimerQueue, HANDLE hTimer, HANDLE hEvtCompletion)
+{
+    NOREF(hTimerQueue); NOREF(hTimer); NOREF(hEvtCompletion);
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+/* This is used by several APIs. */
+
+DECL_KERNEL32(VOID) Fake_InitializeSListHead(PSLIST_HEADER pHead)
+{
+    pHead->Alignment = 0;
+}
+
+
+DECL_KERNEL32(PSLIST_ENTRY) Fake_InterlockedFlushSList(PSLIST_HEADER pHead)
+{
+    PSLIST_ENTRY pRet = NULL;
+    if (pHead->Next.Next)
+    {
+        for (;;)
+        {
+            SLIST_HEADER OldHead = *pHead;
+            SLIST_HEADER NewHead;
+            NewHead.Alignment = 0;
+            NewHead.Sequence  = OldHead.Sequence + 1;
+            if (ASMAtomicCmpXchgU64(&pHead->Alignment, NewHead.Alignment, OldHead.Alignment))
+            {
+                pRet = OldHead.Next.Next;
+                break;
+            }
+        }
+    }
+    return pRet;
+}
+
+DECL_KERNEL32(PSLIST_ENTRY) Fake_InterlockedPopEntrySList(PSLIST_HEADER pHead)
+{
+    PSLIST_ENTRY pRet = NULL;
+    for (;;)
+    {
+        SLIST_HEADER OldHead = *pHead;
+        pRet = OldHead.Next.Next;
+        if (pRet)
+        {
+            SLIST_HEADER NewHead;
+            __try
+            {
+                NewHead.Next.Next = pRet->Next;
+            }
+            __except(EXCEPTION_EXECUTE_HANDLER)
+            {
+                continue;
+            }
+            NewHead.Depth     = OldHead.Depth - 1;
+            NewHead.Sequence  = OldHead.Sequence + 1;
+            if (ASMAtomicCmpXchgU64(&pHead->Alignment, NewHead.Alignment, OldHead.Alignment))
+                break;
+        }
+        else
+            break;
+    }
+    return pRet;
+}
+
+DECL_KERNEL32(PSLIST_ENTRY) Fake_InterlockedPushEntrySList(PSLIST_HEADER pHead, PSLIST_ENTRY pEntry)
+{
+    PSLIST_ENTRY pRet = NULL;
+    for (;;)
+    {
+        SLIST_HEADER OldHead = *pHead;
+        pRet = OldHead.Next.Next;
+        pEntry->Next = pRet;
+        SLIST_HEADER NewHead;
+        NewHead.Next.Next = pEntry;
+        NewHead.Depth     = OldHead.Depth + 1;
+        NewHead.Sequence  = OldHead.Sequence + 1;
+        if (ASMAtomicCmpXchgU64(&pHead->Alignment, NewHead.Alignment, OldHead.Alignment))
+            break;
+    }
+    return pRet;
+}
+
+DECL_KERNEL32(WORD) Fake_QueryDepthSList(PSLIST_HEADER pHead)
+{
+    return pHead->Depth;
+}
+
+
+/* curl drags these in: */
+DECL_KERNEL32(BOOL) Fake_VerifyVersionInfoA(LPOSVERSIONINFOEXA pInfo, DWORD fTypeMask, DWORDLONG fConditionMask)
+{
+    OSVERSIONINFOEXA VerInfo;
+    RT_ZERO(VerInfo);
+    VerInfo.dwOSVersionInfoSize = sizeof(VerInfo);
+    if (!GetVersionExA((OSVERSIONINFO *)&VerInfo))
+    {
+        RT_ZERO(VerInfo);
+        VerInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+        BOOL fRet = GetVersionExA((OSVERSIONINFO *)&VerInfo);
+        if (fRet)
+        { /* likely */ }
+        else
+        {
+            MY_ASSERT(false, "VerifyVersionInfoA: #1");
+            return FALSE;
+        }
+    }
+
+    BOOL fRet = TRUE;
+    for (unsigned i = 0; i < 8 && fRet; i++)
+        if (fTypeMask & RT_BIT_32(i))
+        {
+            uint32_t uLeft, uRight;
+            switch (RT_BIT_32(i))
+            {
+#define MY_CASE(a_Num, a_Member) case a_Num: uLeft = VerInfo.a_Member; uRight = pInfo->a_Member; break
+                MY_CASE(VER_MINORVERSION,       dwMinorVersion);
+                MY_CASE(VER_MAJORVERSION,       dwMajorVersion);
+                MY_CASE(VER_BUILDNUMBER,        dwBuildNumber);
+                MY_CASE(VER_PLATFORMID,         dwPlatformId);
+                MY_CASE(VER_SERVICEPACKMINOR,   wServicePackMinor);
+                MY_CASE(VER_SERVICEPACKMAJOR,   wServicePackMinor);
+                MY_CASE(VER_SUITENAME,          wSuiteMask);
+                MY_CASE(VER_PRODUCT_TYPE,       wProductType);
+#undef  MY_CASE
+                default: uLeft = uRight = 0; MY_ASSERT(false, "VerifyVersionInfoA: #2");
+            }
+            switch ((uint8_t)(fConditionMask >> (i*8)))
+            {
+                case VER_EQUAL:             fRet = uLeft == uRight; break;
+                case VER_GREATER:           fRet = uLeft >  uRight; break;
+                case VER_GREATER_EQUAL:     fRet = uLeft >= uRight; break;
+                case VER_LESS:              fRet = uLeft <  uRight; break;
+                case VER_LESS_EQUAL:        fRet = uLeft <= uRight; break;
+                case VER_AND:               fRet = (uLeft & uRight) == uRight; break;
+                case VER_OR:                fRet = (uLeft & uRight) != 0; break;
+                default:                    fRet = FALSE; MY_ASSERT(false, "VerifyVersionInfoA: #3"); break;
+            }
+        }
+
+    return fRet;
+}
+
+
+DECL_KERNEL32(ULONGLONG) Fake_VerSetConditionMask(ULONGLONG fConditionMask, DWORD fTypeMask, BYTE bOperator)
+{
+    for (unsigned i = 0; i < 8; i++)
+        if (fTypeMask & RT_BIT_32(i))
+        {
+            uint64_t fMask  = UINT64_C(0xff) << (i*8);
+            fConditionMask &= ~fMask;
+            fConditionMask |= (uint64_t)bOperator << (i*8);
+
+        }
+    return fConditionMask;
+}
+
+
+/*
+ * NT 3.51 stuff.
+ */
+
+DECL_KERNEL32(BOOL) Fake_IsProcessorFeaturePresent(DWORD enmProcessorFeature)
+{
+    /* Could make more of an effort here... */
+    RT_NOREF(enmProcessorFeature);
+    return FALSE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_CancelIo(HANDLE hHandle)
+{
+    /* All NT versions the NTDLL API this corresponds to. */
+    RESOLVE_NTDLL_API(NtCancelIoFile);
+    if (pfnNtCancelIoFile)
+    {
+        IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+        NTSTATUS rcNt = pfnNtCancelIoFile(hHandle, &Ios);
+        if (RT_SUCCESS(rcNt))
+            return TRUE;
+        if (rcNt == STATUS_INVALID_HANDLE)
+            SetLastError(ERROR_INVALID_HANDLE);
+        else
+            SetLastError(ERROR_INVALID_FUNCTION);
+    }
+    else
+        SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+
+/*
+ * NT 3.50 stuff.
+ */
+
+DECL_KERNEL32(BOOL) Fake_IsDebuggerPresent(VOID)
+{
+    /* Fallback: */
+    return FALSE;
+}
+
+
+DECL_KERNEL32(VOID) Fake_GetSystemTimeAsFileTime(LPFILETIME pTime)
+{
+    DWORD dwVersion = GetVersion();
+    if (   (dwVersion & 0xff) > 3
+        || (   (dwVersion & 0xff) == 3
+            && ((dwVersion >> 8) & 0xff) >= 50) )
+    {
+        PKUSER_SHARED_DATA pUsd = (PKUSER_SHARED_DATA)MM_SHARED_USER_DATA_VA;
+
+        /* use interrupt time */
+        LARGE_INTEGER Time;
+        do
+        {
+            Time.HighPart = pUsd->SystemTime.High1Time;
+            Time.LowPart  = pUsd->SystemTime.LowPart;
+        } while (pUsd->SystemTime.High2Time != Time.HighPart);
+
+        pTime->dwHighDateTime = Time.HighPart;
+        pTime->dwLowDateTime  = Time.LowPart;
+    }
+    else
+    {
+        /* NT 3.1 didn't have a KUSER_SHARED_DATA nor a GetSystemTimeAsFileTime export. */
+        SYSTEMTIME SystemTime;
+        GetSystemTime(&SystemTime);
+        BOOL fRet = SystemTimeToFileTime(&SystemTime, pTime);
+        if (fRet)
+        { /* likely */ }
+        else
+        {
+            MY_ASSERT(false, "GetSystemTimeAsFileTime: #2");
+            pTime->dwHighDateTime = 0;
+            pTime->dwLowDateTime  = 0;
+        }
+    }
+}
+
+
+/*
+ * NT 3.1 stuff.
+ */
+
+DECL_KERNEL32(BOOL) Fake_GetVersionExA(LPOSVERSIONINFOA pInfo)
+{
+    DWORD dwVersion = GetVersion();
+
+    /* Common fields: */
+    pInfo->dwMajorVersion = dwVersion & 0xff;
+    pInfo->dwMinorVersion = (dwVersion >> 8) & 0xff;
+    if (!(dwVersion & RT_BIT_32(31)))
+        pInfo->dwBuildNumber = dwVersion >> 16;
+    else
+        pInfo->dwBuildNumber = 511;
+    pInfo->dwPlatformId = VER_PLATFORM_WIN32_NT;
+/** @todo get CSD from registry. */
+    pInfo->szCSDVersion[0] = '\0';
+
+    /* OSVERSIONINFOEX fields: */
+    if (pInfo->dwOSVersionInfoSize > sizeof((*pInfo)))
+    {
+        LPOSVERSIONINFOEXA pInfoEx = (LPOSVERSIONINFOEXA)pInfo;
+        if (pInfoEx->dwOSVersionInfoSize > RT_UOFFSETOF(OSVERSIONINFOEXA, wServicePackMinor))
+        {
+            pInfoEx->wServicePackMajor = 0;
+            pInfoEx->wServicePackMinor = 0;
+        }
+        if (pInfoEx->dwOSVersionInfoSize > RT_UOFFSETOF(OSVERSIONINFOEXA, wSuiteMask))
+            pInfoEx->wSuiteMask = 0;
+        if (pInfoEx->dwOSVersionInfoSize > RT_UOFFSETOF(OSVERSIONINFOEXA, wProductType))
+            pInfoEx->wProductType = VER_NT_WORKSTATION;
+        if (pInfoEx->wReserved > RT_UOFFSETOF(OSVERSIONINFOEXA, wProductType))
+            pInfoEx->wReserved = 0;
+    }
+
+    return TRUE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_GetVersionExW(LPOSVERSIONINFOW pInfo)
+{
+    DWORD dwVersion = GetVersion();
+
+    /* Common fields: */
+    pInfo->dwMajorVersion = dwVersion & 0xff;
+    pInfo->dwMinorVersion = (dwVersion >> 8) & 0xff;
+    if (!(dwVersion & RT_BIT_32(31)))
+        pInfo->dwBuildNumber = dwVersion >> 16;
+    else
+        pInfo->dwBuildNumber = 511;
+    pInfo->dwPlatformId = VER_PLATFORM_WIN32_NT;
+/** @todo get CSD from registry. */
+    pInfo->szCSDVersion[0] = '\0';
+
+    /* OSVERSIONINFOEX fields: */
+    if (pInfo->dwOSVersionInfoSize > sizeof((*pInfo)))
+    {
+        LPOSVERSIONINFOEXW pInfoEx = (LPOSVERSIONINFOEXW)pInfo;
+        if (pInfoEx->dwOSVersionInfoSize > RT_UOFFSETOF(OSVERSIONINFOEXW, wServicePackMinor))
+        {
+            pInfoEx->wServicePackMajor = 0;
+            pInfoEx->wServicePackMinor = 0;
+        }
+        if (pInfoEx->dwOSVersionInfoSize > RT_UOFFSETOF(OSVERSIONINFOEXW, wSuiteMask))
+            pInfoEx->wSuiteMask = 0;
+        if (pInfoEx->dwOSVersionInfoSize > RT_UOFFSETOF(OSVERSIONINFOEXW, wProductType))
+            pInfoEx->wProductType = VER_NT_WORKSTATION;
+        if (pInfoEx->wReserved > RT_UOFFSETOF(OSVERSIONINFOEXW, wProductType))
+            pInfoEx->wReserved = 0;
+    }
+
+    return TRUE;
+}
+
+
+DECL_KERNEL32(LPWCH) Fake_GetEnvironmentStringsW(void)
+{
+    /*
+     * Environment is ANSI in NT 3.1. We should only be here for NT 3.1.
+     * For now, don't try do a perfect job converting it, just do it.
+     */
+    char    *pszzEnv = (char *)RTNtCurrentPeb()->ProcessParameters->Environment;
+    size_t   offEnv  = 0;
+    while (pszzEnv[offEnv] != '\0')
+    {
+        size_t cchLen = strlen(&pszzEnv[offEnv]);
+        offEnv += cchLen + 1;
+    }
+    size_t const cchEnv = offEnv + 1;
+
+    PRTUTF16 pwszzEnv = (PRTUTF16)HeapAlloc(GetProcessHeap(), 0, cchEnv * sizeof(RTUTF16));
+    if (!pwszzEnv)
+        return NULL;
+    for (offEnv = 0; offEnv < cchEnv; offEnv++)
+    {
+        unsigned char ch = pwszzEnv[offEnv];
+        if (!(ch & 0x80))
+            pwszzEnv[offEnv] = ch;
+        else
+            pwszzEnv[offEnv] = '_';
+    }
+    return pwszzEnv;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_FreeEnvironmentStringsW(LPWCH pwszzEnv)
+{
+    if (pwszzEnv)
+        HeapFree(GetProcessHeap(), 0, pwszzEnv);
+    return TRUE;
+}
+
+
+DECL_KERNEL32(int) Fake_GetLocaleInfoA(LCID idLocale, LCTYPE enmType, LPSTR pData, int cchData)
+{
+    NOREF(idLocale); NOREF(enmType); NOREF(pData); NOREF(cchData);
+    //MY_ASSERT(false, "GetLocaleInfoA: idLocale=%#x enmType=%#x cchData=%#x", idLocale, enmType, cchData);
+    MY_ASSERT(false, "GetLocaleInfoA");
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return 0;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_EnumSystemLocalesA(LOCALE_ENUMPROCA pfnCallback, DWORD fFlags)
+{
+    NOREF(pfnCallback); NOREF(fFlags);
+    //MY_ASSERT(false, "EnumSystemLocalesA: pfnCallback=%p fFlags=%#x", pfnCallback, fFlags);
+    MY_ASSERT(false, "EnumSystemLocalesA");
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_IsValidLocale(LCID idLocale, DWORD fFlags)
+{
+    NOREF(idLocale); NOREF(fFlags);
+    //MY_ASSERT(false, "IsValidLocale: idLocale fFlags=%#x", idLocale, fFlags);
+    MY_ASSERT(false, "IsValidLocale");
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
+
+
+DECL_KERNEL32(DWORD_PTR) Fake_SetThreadAffinityMask(HANDLE hThread, DWORD_PTR fAffinityMask)
+{
+    SYSTEM_INFO SysInfo;
+    GetSystemInfo(&SysInfo);
+    //MY_ASSERT(false, "SetThreadAffinityMask: hThread=%p fAffinityMask=%p SysInfo.dwActiveProcessorMask=%p",
+    //          hThread, fAffinityMask, SysInfo.dwActiveProcessorMask);
+    MY_ASSERT(false, "SetThreadAffinityMask");
+    if (   SysInfo.dwActiveProcessorMask == fAffinityMask
+        || fAffinityMask                 == ~(DWORD_PTR)0)
+        return fAffinityMask;
+
+    SetLastError(ERROR_NOT_SUPPORTED);
+    RT_NOREF(hThread);
+    return 0;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_GetProcessAffinityMask(HANDLE hProcess, PDWORD_PTR pfProcessAffinityMask, PDWORD_PTR pfSystemAffinityMask)
+{
+    SYSTEM_INFO SysInfo;
+    GetSystemInfo(&SysInfo);
+    //MY_ASSERT(false, "GetProcessAffinityMask: SysInfo.dwActiveProcessorMask=%p", SysInfo.dwActiveProcessorMask);
+    MY_ASSERT(false, "GetProcessAffinityMask");
+    if (pfProcessAffinityMask)
+        *pfProcessAffinityMask = SysInfo.dwActiveProcessorMask;
+    if (pfSystemAffinityMask)
+        *pfSystemAffinityMask  = SysInfo.dwActiveProcessorMask;
+    RT_NOREF(hProcess);
+    return TRUE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_GetHandleInformation(HANDLE hObject, DWORD *pfFlags)
+{
+    OBJECT_HANDLE_FLAG_INFORMATION  Info  = { 0, 0 };
+    DWORD                           cbRet = sizeof(Info);
+    NTSTATUS rcNt = NtQueryObject(hObject, ObjectHandleFlagInformation, &Info, sizeof(Info), &cbRet);
+    if (NT_SUCCESS(rcNt))
+    {
+        *pfFlags = (Info.Inherit          ? HANDLE_FLAG_INHERIT : 0)
+                 | (Info.ProtectFromClose ? HANDLE_FLAG_PROTECT_FROM_CLOSE : 0);
+        return TRUE;
+    }
+    *pfFlags = 0;
+    //MY_ASSERT(rcNt == STATUS_INVALID_HANDLE, "rcNt=%#x", rcNt);
+    MY_ASSERT(rcNt == STATUS_INVALID_HANDLE || rcNt == STATUS_INVALID_INFO_CLASS, "GetHandleInformation");
+    SetLastError(rcNt == STATUS_INVALID_HANDLE ? ERROR_INVALID_HANDLE : ERROR_INVALID_FUNCTION); /* see also process-win.cpp */
+    return FALSE;
+}
+
+
+DECL_KERNEL32(BOOL) Fake_SetHandleInformation(HANDLE hObject, DWORD fMask, DWORD fFlags)
+{
+    NOREF(hObject); NOREF(fMask); NOREF(fFlags);
+    SetLastError(ERROR_INVALID_FUNCTION);
+    return FALSE;
+}
+
+
+
+/**
+ * Resolves all the APIs ones and for all, updating the fake IAT entries.
+ */
+DECLASM(void) FakeResolve_kernel32(void)
+{
+    CURRENT_VERSION_VARIABLE();
+
+    HMODULE hmod = GetModuleHandleW(L"kernel32");
+    MY_ASSERT(hmod != NULL, "kernel32");
+
+#undef MAKE_IMPORT_ENTRY
+#define MAKE_IMPORT_ENTRY(a_uMajorVer, a_uMinorVer, a_Name, a_cb) RESOLVE_IMPORT(a_uMajorVer, a_uMinorVer, a_Name, a_cb)
+#include "vcc100-kernel32-fakes.h"
+
+    g_fInitialized = true;
+}
+
+
+/* Dummy to force dragging in this object in the link, so the linker
+   won't accidentally use the symbols from kernel32. */
+extern "C" int vcc100_kernel32_fakes_cpp(void)
+{
+    return 42;
+}
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-kernel32-fakes.h b/src/VBox/Runtime/r3/win/vcc100-kernel32-fakes.h
new file mode 100644
index 00000000..6a2c04ae
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-kernel32-fakes.h
@@ -0,0 +1,43 @@
+
+COMMENT("XP SP2 / W2K3 SP1")
+MAKE_IMPORT_ENTRY(6,0, DecodePointer, 4)
+MAKE_IMPORT_ENTRY(6,0, EncodePointer, 4)
+COMMENT("XP")
+MAKE_IMPORT_ENTRY(5,1, CreateIoCompletionPort, 16)
+MAKE_IMPORT_ENTRY(5,1, GetQueuedCompletionStatus, 20)
+MAKE_IMPORT_ENTRY(5,1, HeapSetInformation, 16)
+MAKE_IMPORT_ENTRY(5,1, HeapQueryInformation, 20)
+MAKE_IMPORT_ENTRY(5,1, InitializeSListHead, 4)
+MAKE_IMPORT_ENTRY(5,1, InterlockedFlushSList, 4)
+MAKE_IMPORT_ENTRY(5,1, InterlockedPopEntrySList, 4)
+MAKE_IMPORT_ENTRY(5,1, InterlockedPushEntrySList, 8)
+MAKE_IMPORT_ENTRY(5,1, PostQueuedCompletionStatus, 16)
+MAKE_IMPORT_ENTRY(5,1, QueryDepthSList, 4)
+COMMENT("W2K")
+MAKE_IMPORT_ENTRY(5,0, CreateTimerQueue, 0)
+MAKE_IMPORT_ENTRY(5,0, CreateTimerQueueTimer, 28)
+MAKE_IMPORT_ENTRY(5,0, DeleteTimerQueueTimer, 12)
+MAKE_IMPORT_ENTRY(5,0, VerSetConditionMask, 16)
+COMMENT("NT 4 SP4+")
+MAKE_IMPORT_ENTRY(5,0, VerifyVersionInfoA, 16)
+COMMENT("NT 4 SP3+")
+MAKE_IMPORT_ENTRY(5,0, InitializeCriticalSectionAndSpinCount, 8)
+COMMENT("NT 3.51")
+MAKE_IMPORT_ENTRY(4,0, IsProcessorFeaturePresent, 4)
+MAKE_IMPORT_ENTRY(4,0, CancelIo, 4)
+COMMENT("NT 3.50")
+MAKE_IMPORT_ENTRY(3,51, IsDebuggerPresent, 0)
+MAKE_IMPORT_ENTRY(3,51, GetSystemTimeAsFileTime, 4)
+COMMENT("NT 3.1")
+MAKE_IMPORT_ENTRY(3,50, GetVersionExA, 4)
+MAKE_IMPORT_ENTRY(3,50, GetVersionExW, 4)
+MAKE_IMPORT_ENTRY(3,50, GetEnvironmentStringsW, 0)
+MAKE_IMPORT_ENTRY(3,50, FreeEnvironmentStringsW, 4)
+MAKE_IMPORT_ENTRY(3,50, GetLocaleInfoA, 16)
+MAKE_IMPORT_ENTRY(3,50, EnumSystemLocalesA, 8)
+MAKE_IMPORT_ENTRY(3,50, IsValidLocale, 8)
+MAKE_IMPORT_ENTRY(3,50, SetThreadAffinityMask, 8)
+MAKE_IMPORT_ENTRY(3,50, GetProcessAffinityMask, 12)
+MAKE_IMPORT_ENTRY(3,50, GetHandleInformation, 8)
+MAKE_IMPORT_ENTRY(3,50, SetHandleInformation, 12)
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-kernel32-fakesA.asm b/src/VBox/Runtime/r3/win/vcc100-kernel32-fakesA.asm
new file mode 100644
index 00000000..2547ee77
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-kernel32-fakesA.asm
@@ -0,0 +1,36 @@
+; $Id: vcc100-kernel32-fakesA.asm $
+;; @file
+; IPRT - Wrappers for kernel32 APIs missing in NT4 and earlier.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+
+%include "vcc100-fakes.mac"
+
+%define FAKE_MODULE_NAME kernel32
+
+BEGINDATA
+GLOBALNAME vcc100_kernel32_fakes_asm
+
+%include "vcc100-kernel32-fakes.h"
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-msvcrt-fakes.cpp b/src/VBox/Runtime/r3/win/vcc100-msvcrt-fakes.cpp
new file mode 100644
index 00000000..1a026b1d
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-msvcrt-fakes.cpp
@@ -0,0 +1,82 @@
+/* $Id: vcc100-msvcrt-fakes.cpp $ */
+/** @file
+ * IPRT - Tricks to make the Visual C++ 2010 CRT work on NT4, W2K and XP.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/assert.h>
+#include <stdlib.h>
+
+
+#ifndef RT_ARCH_X86
+# error "This code is X86 only"
+#endif
+
+
+
+/* This one is static in libcmt, fortunately no rocket science.  */
+extern "C" void __cdecl my_initterm(PFNRT *papfnStart, PFNRT *papfnEnd)
+{
+    for (; (uintptr_t)papfnStart < (uintptr_t)papfnEnd; papfnStart++)
+        if (*papfnStart)
+            (*papfnStart)();
+}
+
+extern "C" PFNRT __cdecl my_dllonexit(PFNRT pfnToAdd, PFNRT **ppapfnStart, PFNRT **ppapfnEnd)
+{
+    /* This is _very_ crude, but it'll probably do for our purposes... */
+    size_t cItems = *ppapfnEnd - *ppapfnStart;
+    *ppapfnStart = (PFNRT *)realloc(*ppapfnStart, (cItems + 1) * sizeof(**ppapfnStart));
+    (*ppapfnStart)[cItems] = pfnToAdd;
+    *ppapfnEnd = &(*ppapfnStart)[cItems + 1];
+    return pfnToAdd;
+}
+
+extern "C" int _newmode;
+extern "C" int __cdecl __setargv(void);
+extern "C" int __cdecl _setargv(void);
+
+extern "C" int __cdecl my_getmainargs(int *pcArgs, char ***ppapszArgs, char ***ppapszEnv, int fDoWildcardExp, int *pfNewMode)
+{
+    _newmode = *pfNewMode;
+
+    Assert(!fDoWildcardExp);
+    int rc = _setargv();
+    if (rc >= 0)
+    {
+        *pcArgs     = __argc;
+        *ppapszArgs = __argv;
+        *ppapszEnv  = _environ;
+    }
+    return rc;
+}
+
+extern "C" void __cdecl my_setusermatherr(PFNRT pfnIgnore)
+{
+    /* pure stub. */
+}
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-ntdll-fakes.cpp b/src/VBox/Runtime/r3/win/vcc100-ntdll-fakes.cpp
new file mode 100644
index 00000000..82e8b11b
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-ntdll-fakes.cpp
@@ -0,0 +1,74 @@
+/* $Id: vcc100-ntdll-fakes.cpp $ */
+/** @file
+ * IPRT - Tricks to make the Visual C++ 2010 CRT work on NT4, W2K and XP - NTDLL.DLL.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+
+#ifndef RT_ARCH_X86
+# error "This code is X86 only"
+#endif
+
+#include <iprt/win/windows.h>
+
+
+
+/** Dynamically resolves an kernel32 API.   */
+#define RESOLVE_ME(ApiNm) \
+    static bool volatile    s_fInitialized = false; \
+    static decltype(ApiNm) *s_pfnApi = NULL; \
+    decltype(ApiNm)        *pfnApi; \
+    if (s_fInitialized) \
+        pfnApi = s_pfnApi; \
+    else \
+    { \
+        pfnApi = (decltype(pfnApi))GetProcAddress(GetModuleHandleW(L"ntdll.dll"), #ApiNm); \
+        s_pfnApi = pfnApi; \
+        s_fInitialized = true; \
+    } do {} while (0) \
+
+
+extern "C"
+__declspec(dllexport)
+ULONG WINAPI RtlGetLastWin32Error(VOID)
+{
+    RESOLVE_ME(RtlGetLastWin32Error);
+    if (pfnApi)
+        return pfnApi();
+    return GetLastError();
+}
+
+
+/* Dummy to force dragging in this object in the link, so the linker
+   won't accidentally use the symbols from kernel32. */
+extern "C" int vcc100_ntdll_fakes_cpp(void)
+{
+    return 42;
+}
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-ntdll-fakesA.asm b/src/VBox/Runtime/r3/win/vcc100-ntdll-fakesA.asm
new file mode 100644
index 00000000..38ed2228
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-ntdll-fakesA.asm
@@ -0,0 +1,47 @@
+; $Id: vcc100-ntdll-fakesA.asm $
+;; @file
+; IPRT - Wrappers for ntdll APIs misisng NT4.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+%include "iprt/asmdefs.mac"
+
+%ifndef RT_ARCH_X86
+ %error "This is x86 only code.
+%endif
+
+
+%macro MAKE_IMPORT_ENTRY 2
+extern _ %+ %1 %+ @ %+ %2
+global __imp__ %+ %1 %+ @ %+ %2
+__imp__ %+ %1 %+ @ %+ %2:
+    dd _ %+ %1 %+ @ %+ %2
+
+%endmacro
+
+
+BEGINDATA
+GLOBALNAME vcc100_ntdll_fakes_asm
+
+MAKE_IMPORT_ENTRY RtlGetLastWin32Error, 0
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-shell32-fakes.cpp b/src/VBox/Runtime/r3/win/vcc100-shell32-fakes.cpp
new file mode 100644
index 00000000..e5f1e8bb
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-shell32-fakes.cpp
@@ -0,0 +1,93 @@
+/* $Id: vcc100-shell32-fakes.cpp $ */
+/** @file
+ * IPRT - Tricks to make the Visual C++ 2010 CRT work on NT4, W2K and XP.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RT_NO_STRICT /* Minimal deps so that it works on NT 3.51 too. */
+#include <iprt/types.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+
+#ifndef RT_ARCH_X86
+# error "This code is X86 only"
+#endif
+
+#define CommandLineToArgvW                      Ignore_CommandLineToArgvW
+
+#include <iprt/nt/nt-and-windows.h>
+
+#undef CommandLineToArgvW
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Dynamically resolves an kernel32 API.   */
+#define RESOLVE_ME(ApiNm) \
+    static decltype(ShellExecuteW) * volatile s_pfnInitialized = NULL; \
+    static decltype(ApiNm) *s_pfnApi = NULL; \
+    decltype(ApiNm)        *pfnApi; \
+    if (s_pfnInitialized) \
+        pfnApi = s_pfnApi; \
+    else \
+    { \
+        pfnApi = (decltype(pfnApi))GetProcAddress(GetModuleHandleW(L"shell32"), #ApiNm); \
+        s_pfnApi = pfnApi; \
+        s_pfnInitialized = ShellExecuteW; /* ensures shell32 is loaded */ \
+    } do {} while (0)
+
+
+/** Declare a shell32 API.
+ * @note We are not exporting them as that causes duplicate symbol troubles in
+ *       the OpenGL bits. */
+#define DECL_SHELL32(a_Type) extern "C" a_Type WINAPI
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+
+
+DECL_SHELL32(LPWSTR *) CommandLineToArgvW(LPCWSTR pwszCmdLine, int *pcArgs)
+{
+    RESOLVE_ME(CommandLineToArgvW);
+    if (pfnApi)
+        return pfnApi(pwszCmdLine, pcArgs);
+
+    *pcArgs = 0;
+    return NULL;
+}
+
+
+/* Dummy to force dragging in this object in the link, so the linker
+   won't accidentally use the symbols from shell32. */
+extern "C" int vcc100_shell32_fakes_cpp(void)
+{
+    return 42;
+}
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-shell32-fakesA.asm b/src/VBox/Runtime/r3/win/vcc100-shell32-fakesA.asm
new file mode 100644
index 00000000..6b3f76a8
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-shell32-fakesA.asm
@@ -0,0 +1,49 @@
+; $Id: vcc100-shell32-fakesA.asm $
+;; @file
+; IPRT - Wrappers for shell32 APIs missing in NT 4 and earlier.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+
+%include "iprt/asmdefs.mac"
+
+%ifndef RT_ARCH_X86
+ %error "This is x86 only code.
+%endif
+
+
+%macro MAKE_IMPORT_ENTRY 2
+extern _ %+ %1 %+ @ %+ %2
+global __imp__ %+ %1 %+ @ %+ %2
+__imp__ %+ %1 %+ @ %+ %2:
+    dd _ %+ %1 %+ @ %+ %2
+
+%endmacro
+
+
+BEGINDATA
+GLOBALNAME vcc100_shell32_fakes_asm
+
+; NT 3.1
+MAKE_IMPORT_ENTRY CommandLineToArgvW, 8
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-ws2_32-fakes.cpp b/src/VBox/Runtime/r3/win/vcc100-ws2_32-fakes.cpp
new file mode 100644
index 00000000..c60ad3fc
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-ws2_32-fakes.cpp
@@ -0,0 +1,103 @@
+/* $Id: vcc100-ws2_32-fakes.cpp $ */
+/** @file
+ * IPRT - Tricks to make the Visual C++ 2010 CRT work on NT4, W2K and XP - WS2_32.DLL.
+ */
+
+/*
+ * Copyright (C) 2012-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+#include <iprt/asm.h>
+#include <iprt/string.h>
+
+#ifndef RT_ARCH_X86
+# error "This code is X86 only"
+#endif
+
+#define getaddrinfo                             Ignore_getaddrinfo
+#define freeaddrinfo                            Ignore_freeaddrinfo
+
+#include <iprt/win/winsock2.h>
+#include <iprt/win/ws2tcpip.h>
+
+#undef getaddrinfo
+#undef freeaddrinfo
+
+
+/** Dynamically resolves an kernel32 API.   */
+#define RESOLVE_ME(ApiNm) \
+    static bool volatile    s_fInitialized = false; \
+    static decltype(ApiNm) *s_pfnApi = NULL; \
+    decltype(ApiNm)        *pfnApi; \
+    if (s_fInitialized) \
+        pfnApi = s_pfnApi; \
+    else \
+    { \
+        pfnApi = (decltype(pfnApi))GetProcAddress(GetModuleHandleW(L"wc2_32.dll"), #ApiNm); \
+        s_pfnApi = pfnApi; \
+        s_fInitialized = true; \
+    } do {} while (0) \
+
+
+extern "C"
+__declspec(dllexport)
+int WINAPI getaddrinfo(const char *pszNodeName, const char *pszServiceName, const struct addrinfo *pHints,
+                       struct addrinfo **ppResults)
+{
+    RESOLVE_ME(getaddrinfo);
+    if (pfnApi)
+        return pfnApi(pszNodeName, pszServiceName, pHints, ppResults);
+
+    /** @todo  fallback */
+    WSASetLastError(WSAEAFNOSUPPORT);
+    return WSAEAFNOSUPPORT;
+}
+
+
+
+extern "C"
+__declspec(dllexport)
+void WINAPI freeaddrinfo(struct addrinfo *pResults)
+{
+    RESOLVE_ME(freeaddrinfo);
+    if (pfnApi)
+        pfnApi(pResults);
+    else
+    {
+        Assert(!pResults);
+        /** @todo  fallback */
+    }
+}
+
+
+
+/* Dummy to force dragging in this object in the link, so the linker
+   won't accidentally use the symbols from kernel32. */
+extern "C" int vcc100_ws2_32_fakes_cpp(void)
+{
+    return 42;
+}
+
diff --git a/src/VBox/Runtime/r3/win/vcc100-ws2_32-fakesA.asm b/src/VBox/Runtime/r3/win/vcc100-ws2_32-fakesA.asm
new file mode 100644
index 00000000..edd86bd2
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/vcc100-ws2_32-fakesA.asm
@@ -0,0 +1,48 @@
+; $Id: vcc100-ws2_32-fakesA.asm $
+;; @file
+; IPRT - Wrappers for ws2_32 APIs misisng NT4.
+;
+
+;
+; Copyright (C) 2006-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+%include "iprt/asmdefs.mac"
+
+%ifndef RT_ARCH_X86
+ %error "This is x86 only code.
+%endif
+
+
+%macro MAKE_IMPORT_ENTRY 2
+extern _ %+ %1 %+ @ %+ %2
+global __imp__ %+ %1 %+ @ %+ %2
+__imp__ %+ %1 %+ @ %+ %2:
+    dd _ %+ %1 %+ @ %+ %2
+
+%endmacro
+
+
+BEGINDATA
+GLOBALNAME vcc100_ws2_32_fakes_asm
+
+MAKE_IMPORT_ENTRY getaddrinfo, 16
+MAKE_IMPORT_ENTRY freeaddrinfo, 4
+