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diff --git a/os/win32/os.h b/os/win32/os.h
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--- /dev/null
+++ b/os/win32/os.h
@@ -0,0 +1,136 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file win32/os.h
+ * @brief This file in included in all Apache source code. It contains definitions
+ * of facilities available on _this_ operating system (HAVE_* macros),
+ * and prototypes of OS specific functions defined in os.c or os-inline.c
+ *
+ * @defgroup APACHE_OS_WIN32 win32
+ * @ingroup  APACHE_OS
+ * @{
+ */
+
+#ifdef WIN32
+
+#ifndef AP_OS_H
+#define AP_OS_H
+/* Delegate windows include to the apr.h header, if USER or GDI declarations
+ * are required (for a window rather than console application), include
+ * windows.h prior to any other Apache header files.
+ */
+#include "apr_pools.h"
+
+#include <io.h>
+#include <fcntl.h>
+
+#ifdef _WIN64
+#define PLATFORM "Win64"
+#else
+#define PLATFORM "Win32"
+#endif
+
+/* Define command-line rewriting for this platform, handled by core.
+ * For Windows, this is currently handled inside the WinNT MPM.
+ * XXX To support a choice of MPMs, extract common platform behavior
+ * into a function specified here.
+ */
+#define AP_PLATFORM_REWRITE_ARGS_HOOK NULL
+
+/* going away shortly... */
+#define HAVE_DRIVE_LETTERS
+#define HAVE_UNC_PATHS
+#define CASE_BLIND_FILESYSTEM
+
+#include <stddef.h>
+#include <stdlib.h> /* for exit() */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* BIG RED WARNING: exit() is mapped to allow us to capture the exit
+ * status.  This header must only be included from modules linked into
+ * the ApacheCore.dll - since it's a horrible behavior to exit() from
+ * any module outside the main() block, and we -will- assume it's a
+ * fatal error.
+ */
+
+AP_DECLARE_DATA extern int ap_real_exit_code;
+
+#define exit(status) ((exit)((ap_real_exit_code==2) \
+                                ? (ap_real_exit_code = (status)) \
+                                : ((ap_real_exit_code = 0), (status))))
+
+#ifdef AP_DECLARE_EXPORT
+
+/* Defined in util_win32.c and available only to the core module for
+ * win32 MPM design.
+ */
+
+AP_DECLARE(apr_status_t) ap_os_proc_filepath(char **binpath, apr_pool_t *p);
+
+typedef enum {
+    AP_DLL_WINBASEAPI = 0,    /* kernel32 From WinBase.h      */
+    AP_DLL_WINADVAPI = 1,     /* advapi32 From WinBase.h      */
+    AP_DLL_WINSOCKAPI = 2,    /* mswsock  From WinSock.h      */
+    AP_DLL_WINSOCK2API = 3,   /* ws2_32   From WinSock2.h     */
+    AP_DLL_defined = 4        /* must define as last idx_ + 1 */
+} ap_dlltoken_e;
+
+FARPROC ap_load_dll_func(ap_dlltoken_e fnLib, char* fnName, int ordinal);
+
+#define AP_DECLARE_LATE_DLL_FUNC(lib, rettype, calltype, fn, ord, args, names) \
+    typedef rettype (calltype *ap_winapi_fpt_##fn) args; \
+    static ap_winapi_fpt_##fn ap_winapi_pfn_##fn = NULL; \
+    static APR_INLINE rettype ap_winapi_##fn args \
+    {   if (!ap_winapi_pfn_##fn) \
+            ap_winapi_pfn_##fn = (ap_winapi_fpt_##fn) ap_load_dll_func(lib, #fn, ord); \
+        return (*(ap_winapi_pfn_##fn)) names; }; \
+
+/* Win2K kernel only */
+AP_DECLARE_LATE_DLL_FUNC(AP_DLL_WINADVAPI, BOOL, WINAPI, ChangeServiceConfig2A, 0, (
+    SC_HANDLE hService,
+    DWORD dwInfoLevel,
+    LPVOID lpInfo),
+    (hService, dwInfoLevel, lpInfo));
+#undef ChangeServiceConfig2
+#define ChangeServiceConfig2 ap_winapi_ChangeServiceConfig2A
+
+/* WinNT kernel only */
+AP_DECLARE_LATE_DLL_FUNC(AP_DLL_WINBASEAPI, BOOL, WINAPI, CancelIo, 0, (
+    IN HANDLE hFile),
+    (hFile));
+#undef CancelIo
+#define CancelIo ap_winapi_CancelIo
+
+/* Win9x kernel only */
+AP_DECLARE_LATE_DLL_FUNC(AP_DLL_WINBASEAPI, DWORD, WINAPI, RegisterServiceProcess, 0, (
+    DWORD dwProcessId,
+    DWORD dwType),
+    (dwProcessId, dwType));
+#define RegisterServiceProcess ap_winapi_RegisterServiceProcess
+
+#endif /* def AP_DECLARE_EXPORT */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* ndef AP_OS_H */
+#endif  /* def WIN32 */
+/** @} */