Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 913 insertions, 0 deletions

diff --git a/uriloader/exthandler/win/nsMIMEInfoWin.cpp b/uriloader/exthandler/win/nsMIMEInfoWin.cpp
new file mode 100644
index 0000000000..758b2018a7
--- /dev/null
+++ b/uriloader/exthandler/win/nsMIMEInfoWin.cpp
@@ -0,0 +1,913 @@
+/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsArrayEnumerator.h"
+#include "nsComponentManagerUtils.h"
+#include "nsCOMArray.h"
+#include "nsLocalFile.h"
+#include "nsMIMEInfoWin.h"
+#include "nsIMIMEService.h"
+#include "nsNetUtil.h"
+#include <windows.h>
+#include <shellapi.h>
+#include "nsIMutableArray.h"
+#include "nsTArray.h"
+#include <shlobj.h>
+#include "nsIWindowsRegKey.h"
+#include "nsUnicharUtils.h"
+#include "nsTextToSubURI.h"
+#include "nsVariant.h"
+#include "mozilla/CmdLineAndEnvUtils.h"
+#include "mozilla/ShellHeaderOnlyUtils.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "mozilla/UrlmonHeaderOnlyUtils.h"
+#include "mozilla/UniquePtrExtensions.h"
+
+#define RUNDLL32_EXE L"\\rundll32.exe"
+
+NS_IMPL_ISUPPORTS_INHERITED(nsMIMEInfoWin, nsMIMEInfoBase, nsIPropertyBag)
+
+nsMIMEInfoWin::~nsMIMEInfoWin() {}
+
+nsresult nsMIMEInfoWin::LaunchDefaultWithFile(nsIFile* aFile) {
+  // Launch the file, unless it is an executable.
+  bool executable = true;
+  aFile->IsExecutable(&executable);
+  if (executable) return NS_ERROR_FAILURE;
+
+  return aFile->Launch();
+}
+
+nsresult nsMIMEInfoWin::ShellExecuteWithIFile(nsIFile* aExecutable, int aArgc,
+                                              const wchar_t** aArgv) {
+  nsresult rv;
+
+  NS_ASSERTION(aArgc >= 1, "aArgc must be at least 1");
+
+  nsAutoString execPath;
+  rv = aExecutable->GetTarget(execPath);
+  if (NS_FAILED(rv) || execPath.IsEmpty()) {
+    rv = aExecutable->GetPath(execPath);
+  }
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  auto assembledArgs = mozilla::MakeCommandLine(aArgc, aArgv);
+  if (!assembledArgs) {
+    return NS_ERROR_FILE_EXECUTION_FAILED;
+  }
+
+  _bstr_t execPathBStr(execPath.get());
+  // Pass VT_ERROR/DISP_E_PARAMNOTFOUND to omit an optional RPC parameter
+  // to execute a file with the default verb.
+  _variant_t verbDefault(DISP_E_PARAMNOTFOUND, VT_ERROR);
+  _variant_t workingDir;
+  _variant_t showCmd(SW_SHOWNORMAL);
+
+  // Ask Explorer to ShellExecute on our behalf, as some applications such as
+  // Skype for Business do not start correctly when inheriting our process's
+  // migitation policies.
+  // It does not work in a special environment such as Citrix.  In such a case
+  // we fall back to launching an application as a child process.  We need to
+  // find a way to handle the combination of these interop issues.
+  mozilla::LauncherVoidResult shellExecuteOk = mozilla::ShellExecuteByExplorer(
+      execPathBStr, assembledArgs.get(), verbDefault, workingDir, showCmd);
+  if (shellExecuteOk.isErr()) {
+    // No need to pass assembledArgs to LaunchWithIProcess.  aArgv will be
+    // processed in nsProcess::RunProcess.
+    return LaunchWithIProcess(aExecutable, aArgc,
+                              reinterpret_cast<const char16_t**>(aArgv));
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMIMEInfoWin::LaunchWithFile(nsIFile* aFile) {
+  nsresult rv;
+
+  // it doesn't make any sense to call this on protocol handlers
+  NS_ASSERTION(mClass == eMIMEInfo,
+               "nsMIMEInfoBase should have mClass == eMIMEInfo");
+
+  if (AutomationOnlyCheckIfLaunchStubbed(aFile)) {
+    return NS_OK;
+  }
+
+  if (mPreferredAction == useSystemDefault) {
+    nsCOMPtr<nsIFile> defaultApp = GetDefaultApplication();
+    if (defaultApp &&
+        mozilla::StaticPrefs::browser_pdf_launchDefaultEdgeAsApp()) {
+      // Since Edgium is the default handler for PDF and other kinds of files,
+      // if we're using the OS default and it's Edgium prefer its app mode so it
+      // operates as a viewer (without browser toolbars). Bug 1632277.
+      nsAutoCString defaultAppExecutable;
+      rv = defaultApp->GetNativeLeafName(defaultAppExecutable);
+      if (NS_SUCCEEDED(rv) &&
+          defaultAppExecutable.LowerCaseEqualsLiteral("msedge.exe")) {
+        nsAutoString path;
+        rv = aFile->GetPath(path);
+        if (NS_SUCCEEDED(rv)) {
+          // If the --app flag doesn't work we'll want to fallback to a
+          // regular path. Send two args so we call `msedge.exe --app={path}
+          // {path}`.
+          nsAutoString appArg;
+          appArg.AppendLiteral("--app=");
+          appArg.Append(path);
+          const wchar_t* argv[] = {appArg.get(), path.get()};
+
+          return ShellExecuteWithIFile(defaultApp, mozilla::ArrayLength(argv),
+                                       argv);
+        }
+      }
+    }
+    return LaunchDefaultWithFile(aFile);
+  }
+
+  if (mPreferredAction == useHelperApp) {
+    if (!mPreferredApplication) return NS_ERROR_FILE_NOT_FOUND;
+
+    // at the moment, we only know how to hand files off to local handlers
+    nsCOMPtr<nsILocalHandlerApp> localHandler =
+        do_QueryInterface(mPreferredApplication, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIFile> executable;
+    rv = localHandler->GetExecutable(getter_AddRefs(executable));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // Deal with local dll based handlers
+    nsCString filename;
+    executable->GetNativeLeafName(filename);
+    if (filename.Length() > 4) {
+      nsCString extension(Substring(filename, filename.Length() - 4, 4));
+
+      if (extension.LowerCaseEqualsLiteral(".dll")) {
+        nsAutoString args;
+
+        // executable is rundll32, everything else is a list of parameters,
+        // including the dll handler.
+        if (!GetDllLaunchInfo(executable, aFile, args, false))
+          return NS_ERROR_INVALID_ARG;
+
+        WCHAR rundll32Path[MAX_PATH + sizeof(RUNDLL32_EXE) / sizeof(WCHAR) +
+                           1] = {L'\0'};
+        if (!GetSystemDirectoryW(rundll32Path, MAX_PATH)) {
+          return NS_ERROR_FILE_NOT_FOUND;
+        }
+        lstrcatW(rundll32Path, RUNDLL32_EXE);
+
+        SHELLEXECUTEINFOW seinfo;
+        memset(&seinfo, 0, sizeof(seinfo));
+        seinfo.cbSize = sizeof(SHELLEXECUTEINFOW);
+        seinfo.fMask = 0;
+        seinfo.hwnd = nullptr;
+        seinfo.lpVerb = nullptr;
+        seinfo.lpFile = rundll32Path;
+        seinfo.lpParameters = args.get();
+        seinfo.lpDirectory = nullptr;
+        seinfo.nShow = SW_SHOWNORMAL;
+        if (ShellExecuteExW(&seinfo)) return NS_OK;
+
+        switch ((LONG_PTR)seinfo.hInstApp) {
+          case 0:
+          case SE_ERR_OOM:
+            return NS_ERROR_OUT_OF_MEMORY;
+          case SE_ERR_ACCESSDENIED:
+            return NS_ERROR_FILE_ACCESS_DENIED;
+          case SE_ERR_ASSOCINCOMPLETE:
+          case SE_ERR_NOASSOC:
+            return NS_ERROR_UNEXPECTED;
+          case SE_ERR_DDEBUSY:
+          case SE_ERR_DDEFAIL:
+          case SE_ERR_DDETIMEOUT:
+            return NS_ERROR_NOT_AVAILABLE;
+          case SE_ERR_DLLNOTFOUND:
+            return NS_ERROR_FAILURE;
+          case SE_ERR_SHARE:
+            return NS_ERROR_FILE_IS_LOCKED;
+          default:
+            switch (GetLastError()) {
+              case ERROR_FILE_NOT_FOUND:
+                return NS_ERROR_FILE_NOT_FOUND;
+              case ERROR_PATH_NOT_FOUND:
+                return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+              case ERROR_BAD_FORMAT:
+                return NS_ERROR_FILE_CORRUPTED;
+            }
+        }
+        return NS_ERROR_FILE_EXECUTION_FAILED;
+      }
+    }
+    nsAutoString path;
+    aFile->GetPath(path);
+    const wchar_t* argv[] = {path.get()};
+    return ShellExecuteWithIFile(executable, mozilla::ArrayLength(argv), argv);
+  }
+
+  return NS_ERROR_INVALID_ARG;
+}
+
+NS_IMETHODIMP
+nsMIMEInfoWin::GetHasDefaultHandler(bool* _retval) {
+  // We have a default application if we have a description
+  // We can ShellExecute anything; however, callers are probably interested if
+  // there is really an application associated with this type of file
+  *_retval = !mDefaultAppDescription.IsEmpty();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMIMEInfoWin::GetEnumerator(nsISimpleEnumerator** _retval) {
+  nsCOMArray<nsIVariant> properties;
+
+  nsCOMPtr<nsIVariant> variant;
+  GetProperty(u"defaultApplicationIconURL"_ns, getter_AddRefs(variant));
+  if (variant) properties.AppendObject(variant);
+
+  GetProperty(u"customApplicationIconURL"_ns, getter_AddRefs(variant));
+  if (variant) properties.AppendObject(variant);
+
+  return NS_NewArrayEnumerator(_retval, properties, NS_GET_IID(nsIVariant));
+}
+
+static nsresult GetIconURLVariant(nsIFile* aApplication, nsIVariant** _retval) {
+  nsAutoCString fileURLSpec;
+  NS_GetURLSpecFromFile(aApplication, fileURLSpec);
+  nsAutoCString iconURLSpec;
+  iconURLSpec.AssignLiteral("moz-icon://");
+  iconURLSpec += fileURLSpec;
+  RefPtr<nsVariant> writable(new nsVariant());
+  writable->SetAsAUTF8String(iconURLSpec);
+  writable.forget(_retval);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMIMEInfoWin::GetProperty(const nsAString& aName, nsIVariant** _retval) {
+  nsresult rv;
+  nsCOMPtr<nsIFile> defaultApp = GetDefaultApplication();
+  if (defaultApp && aName.EqualsLiteral(PROPERTY_DEFAULT_APP_ICON_URL)) {
+    rv = GetIconURLVariant(defaultApp, _retval);
+    NS_ENSURE_SUCCESS(rv, rv);
+  } else if (mPreferredApplication &&
+             aName.EqualsLiteral(PROPERTY_CUSTOM_APP_ICON_URL)) {
+    nsCOMPtr<nsILocalHandlerApp> localHandler =
+        do_QueryInterface(mPreferredApplication, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIFile> executable;
+    rv = localHandler->GetExecutable(getter_AddRefs(executable));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = GetIconURLVariant(executable, _retval);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
+
+// this implementation was pretty much copied verbatime from
+// Tony Robinson's code in nsExternalProtocolWin.cpp
+nsresult nsMIMEInfoWin::LoadUriInternal(nsIURI* aURL) {
+  nsresult rv = NS_OK;
+
+  // 1. Find the default app for this protocol
+  // 2. Set up the command line
+  // 3. Launch the app.
+
+  // For now, we'll just cheat essentially, check for the command line
+  // then just call ShellExecute()!
+
+  if (aURL) {
+    // extract the url spec from the url
+    nsAutoCString urlSpec;
+    aURL->GetAsciiSpec(urlSpec);
+
+    // Unescape non-ASCII characters in the URL
+    nsAutoString utf16Spec;
+    if (NS_FAILED(nsTextToSubURI::UnEscapeNonAsciiURI("UTF-8"_ns, urlSpec,
+                                                      utf16Spec))) {
+      CopyASCIItoUTF16(urlSpec, utf16Spec);
+    }
+
+    // Ask the shell/urlmon to parse |utf16Spec| to avoid malformed URLs.
+    // Failure is indicative of a potential security issue so we should
+    // bail out if so.
+    mozilla::LauncherResult<_bstr_t> validatedUri =
+        mozilla::UrlmonValidateUri(utf16Spec.get());
+    if (validatedUri.isErr()) {
+      return NS_ERROR_FAILURE;
+    }
+
+    _variant_t args;
+    _variant_t verb(L"open");
+    _variant_t workingDir;
+    _variant_t showCmd(SW_SHOWNORMAL);
+
+    // To open a uri, we first try ShellExecuteByExplorer, which starts a new
+    // process as a child process of explorer.exe, because applications may not
+    // support the mitigation policies inherited from our process.  If it fails,
+    // we fall back to ShellExecuteExW.
+    //
+    // For Thunderbird, however, there is a known issue that
+    // ShellExecuteByExplorer succeeds but explorer.exe shows an error popup
+    // if a uri to open includes credentials.  This does not happen in Firefox
+    // because Firefox does not have to launch a process to open a uri.
+    //
+    // Since Thunderbird does not use mitigation policies which could cause
+    // compatibility issues, we get no benefit from using
+    // ShellExecuteByExplorer.  Thus we skip it and go straight to
+    // ShellExecuteExW for Thunderbird.
+#ifndef MOZ_THUNDERBIRD
+    mozilla::LauncherVoidResult shellExecuteOk =
+        mozilla::ShellExecuteByExplorer(validatedUri.inspect(), args, verb,
+                                        workingDir, showCmd);
+    if (shellExecuteOk.isOk()) {
+      return NS_OK;
+    }
+#endif  // MOZ_THUNDERBIRD
+
+    SHELLEXECUTEINFOW sinfo = {sizeof(sinfo)};
+    sinfo.fMask = SEE_MASK_NOASYNC;
+    sinfo.lpVerb = V_BSTR(&verb);
+    sinfo.nShow = showCmd;
+    sinfo.lpFile = validatedUri.inspect();
+
+    BOOL result = ShellExecuteExW(&sinfo);
+    if (!result || reinterpret_cast<LONG_PTR>(sinfo.hInstApp) < 32) {
+      rv = NS_ERROR_FAILURE;
+    }
+  }
+
+  return rv;
+}
+
+void nsMIMEInfoWin::UpdateDefaultInfoIfStale() {
+  if (!mIsDefaultAppInfoFresh) {
+    nsCOMPtr<nsIMIMEService> mime = do_GetService("@mozilla.org/mime;1");
+    if (mime) {
+      mime->UpdateDefaultAppInfo(static_cast<nsIMIMEInfo*>(this));
+    }
+    mIsDefaultAppInfoFresh = true;
+  }
+}
+
+// Given a path to a local file, return its nsILocalHandlerApp instance.
+bool nsMIMEInfoWin::GetLocalHandlerApp(const nsAString& aCommandHandler,
+                                       nsCOMPtr<nsILocalHandlerApp>& aApp) {
+  nsCOMPtr<nsIFile> locfile;
+  nsresult rv = NS_NewLocalFile(aCommandHandler, true, getter_AddRefs(locfile));
+  if (NS_FAILED(rv)) return false;
+
+  aApp = do_CreateInstance("@mozilla.org/uriloader/local-handler-app;1");
+  if (!aApp) return false;
+
+  aApp->SetExecutable(locfile);
+  return true;
+}
+
+// Return the cleaned up file path associated with a command verb
+// located in root/Applications.
+bool nsMIMEInfoWin::GetAppsVerbCommandHandler(const nsAString& appExeName,
+                                              nsAString& applicationPath,
+                                              bool edit) {
+  nsCOMPtr<nsIWindowsRegKey> appKey =
+      do_CreateInstance("@mozilla.org/windows-registry-key;1");
+  if (!appKey) return false;
+
+  // HKEY_CLASSES_ROOT\Applications\iexplore.exe
+  nsAutoString applicationsPath;
+  applicationsPath.AppendLiteral("Applications\\");
+  applicationsPath.Append(appExeName);
+
+  nsresult rv =
+      appKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, applicationsPath,
+                   nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_FAILED(rv)) return false;
+
+  // Check for the NoOpenWith flag, if it exists
+  uint32_t value;
+  if (NS_SUCCEEDED(appKey->ReadIntValue(u"NoOpenWith"_ns, &value)) &&
+      value == 1)
+    return false;
+
+  nsAutoString dummy;
+  if (NS_SUCCEEDED(appKey->ReadStringValue(u"NoOpenWith"_ns, dummy)))
+    return false;
+
+  appKey->Close();
+
+  // HKEY_CLASSES_ROOT\Applications\iexplore.exe\shell\open\command
+  applicationsPath.AssignLiteral("Applications\\");
+  applicationsPath.Append(appExeName);
+  if (!edit)
+    applicationsPath.AppendLiteral("\\shell\\open\\command");
+  else
+    applicationsPath.AppendLiteral("\\shell\\edit\\command");
+
+  rv = appKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, applicationsPath,
+                    nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_FAILED(rv)) return false;
+
+  nsAutoString appFilesystemCommand;
+  if (NS_SUCCEEDED(appKey->ReadStringValue(u""_ns, appFilesystemCommand))) {
+    // Expand environment vars, clean up any misc.
+    if (!nsLocalFile::CleanupCmdHandlerPath(appFilesystemCommand)) return false;
+
+    applicationPath = appFilesystemCommand;
+    return true;
+  }
+  return false;
+}
+
+// Return a fully populated command string based on
+// passing information. Used in launchWithFile to trace
+// back to the full handler path based on the dll.
+// (dll, targetfile, return args, open/edit)
+bool nsMIMEInfoWin::GetDllLaunchInfo(nsIFile* aDll, nsIFile* aFile,
+                                     nsAString& args, bool edit) {
+  if (!aDll || !aFile) return false;
+
+  nsString appExeName;
+  aDll->GetLeafName(appExeName);
+
+  nsCOMPtr<nsIWindowsRegKey> appKey =
+      do_CreateInstance("@mozilla.org/windows-registry-key;1");
+  if (!appKey) return false;
+
+  // HKEY_CLASSES_ROOT\Applications\iexplore.exe
+  nsAutoString applicationsPath;
+  applicationsPath.AppendLiteral("Applications\\");
+  applicationsPath.Append(appExeName);
+
+  nsresult rv =
+      appKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, applicationsPath,
+                   nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_FAILED(rv)) return false;
+
+  // Check for the NoOpenWith flag, if it exists
+  uint32_t value;
+  rv = appKey->ReadIntValue(u"NoOpenWith"_ns, &value);
+  if (NS_SUCCEEDED(rv) && value == 1) return false;
+
+  nsAutoString dummy;
+  if (NS_SUCCEEDED(appKey->ReadStringValue(u"NoOpenWith"_ns, dummy)))
+    return false;
+
+  appKey->Close();
+
+  // HKEY_CLASSES_ROOT\Applications\iexplore.exe\shell\open\command
+  applicationsPath.AssignLiteral("Applications\\");
+  applicationsPath.Append(appExeName);
+  if (!edit)
+    applicationsPath.AppendLiteral("\\shell\\open\\command");
+  else
+    applicationsPath.AppendLiteral("\\shell\\edit\\command");
+
+  rv = appKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, applicationsPath,
+                    nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_FAILED(rv)) return false;
+
+  nsAutoString appFilesystemCommand;
+  if (NS_SUCCEEDED(appKey->ReadStringValue(u""_ns, appFilesystemCommand))) {
+    // Replace embedded environment variables.
+    uint32_t bufLength =
+        ::ExpandEnvironmentStringsW(appFilesystemCommand.get(), nullptr, 0);
+    if (bufLength == 0)  // Error
+      return false;
+
+    auto destination = mozilla::MakeUniqueFallible<wchar_t[]>(bufLength);
+    if (!destination) return false;
+    if (!::ExpandEnvironmentStringsW(appFilesystemCommand.get(),
+                                     destination.get(), bufLength))
+      return false;
+
+    appFilesystemCommand.Assign(destination.get());
+
+    // C:\Windows\System32\rundll32.exe "C:\Program Files\Windows
+    // Photo Gallery\PhotoViewer.dll", ImageView_Fullscreen %1
+    nsAutoString params;
+    constexpr auto rundllSegment = u"rundll32.exe "_ns;
+    int32_t index = appFilesystemCommand.Find(rundllSegment);
+    if (index > kNotFound) {
+      params.Append(
+          Substring(appFilesystemCommand, index + rundllSegment.Length()));
+    } else {
+      params.Append(appFilesystemCommand);
+    }
+
+    // check to make sure we have a %1 and fill it
+    constexpr auto percentOneParam = u"%1"_ns;
+    index = params.Find(percentOneParam);
+    if (index == kNotFound)  // no parameter
+      return false;
+
+    nsString target;
+    aFile->GetTarget(target);
+    params.Replace(index, 2, target);
+
+    args = params;
+
+    return true;
+  }
+  return false;
+}
+
+// Return the cleaned up file path associated with a progid command
+// verb located in root.
+bool nsMIMEInfoWin::GetProgIDVerbCommandHandler(const nsAString& appProgIDName,
+                                                nsAString& applicationPath,
+                                                bool edit) {
+  nsCOMPtr<nsIWindowsRegKey> appKey =
+      do_CreateInstance("@mozilla.org/windows-registry-key;1");
+  if (!appKey) return false;
+
+  nsAutoString appProgId(appProgIDName);
+
+  // HKEY_CLASSES_ROOT\Windows.XPSReachViewer\shell\open\command
+  if (!edit)
+    appProgId.AppendLiteral("\\shell\\open\\command");
+  else
+    appProgId.AppendLiteral("\\shell\\edit\\command");
+
+  nsresult rv = appKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, appProgId,
+                             nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_FAILED(rv)) return false;
+
+  nsAutoString appFilesystemCommand;
+  if (NS_SUCCEEDED(appKey->ReadStringValue(u""_ns, appFilesystemCommand))) {
+    // Expand environment vars, clean up any misc.
+    if (!nsLocalFile::CleanupCmdHandlerPath(appFilesystemCommand)) return false;
+
+    applicationPath = appFilesystemCommand;
+    return true;
+  }
+  return false;
+}
+
+// Helper routine used in tracking app lists. Converts path
+// entries to lower case and stores them in the trackList array.
+void nsMIMEInfoWin::ProcessPath(nsCOMPtr<nsIMutableArray>& appList,
+                                nsTArray<nsString>& trackList,
+                                const nsAString& appFilesystemCommand) {
+  nsAutoString lower(appFilesystemCommand);
+  ToLowerCase(lower);
+
+  // Don't include firefox.exe in the list
+  WCHAR exe[MAX_PATH + 1];
+  uint32_t len = GetModuleFileNameW(nullptr, exe, MAX_PATH);
+  if (len < MAX_PATH && len != 0) {
+    int32_t index = lower.Find(reinterpret_cast<const char16_t*>(exe));
+    if (index != -1) return;
+  }
+
+  nsCOMPtr<nsILocalHandlerApp> aApp;
+  if (!GetLocalHandlerApp(appFilesystemCommand, aApp)) return;
+
+  // Save in our main tracking arrays
+  appList->AppendElement(aApp);
+  trackList.AppendElement(lower);
+}
+
+// Helper routine that handles a compare between a path
+// and an array of paths.
+static bool IsPathInList(nsAString& appPath, nsTArray<nsString>& trackList) {
+  // trackList data is always lowercase, see ProcessPath
+  // above.
+  nsAutoString tmp(appPath);
+  ToLowerCase(tmp);
+
+  for (uint32_t i = 0; i < trackList.Length(); i++) {
+    if (tmp.Equals(trackList[i])) return true;
+  }
+  return false;
+}
+
+/**
+ * Returns a list of nsILocalHandlerApp objects containing local
+ * handlers associated with this mimeinfo. Implemented per
+ * platform using information in this object to generate the
+ * best list. Typically used for an "open with" style user
+ * option.
+ *
+ * @return nsIArray of nsILocalHandlerApp
+ */
+NS_IMETHODIMP
+nsMIMEInfoWin::GetPossibleLocalHandlers(nsIArray** _retval) {
+  nsresult rv;
+
+  *_retval = nullptr;
+
+  nsCOMPtr<nsIMutableArray> appList = do_CreateInstance("@mozilla.org/array;1");
+
+  if (!appList) return NS_ERROR_FAILURE;
+
+  nsTArray<nsString> trackList;
+
+  nsAutoCString fileExt;
+  GetPrimaryExtension(fileExt);
+
+  nsCOMPtr<nsIWindowsRegKey> regKey =
+      do_CreateInstance("@mozilla.org/windows-registry-key;1");
+  if (!regKey) return NS_ERROR_FAILURE;
+  nsCOMPtr<nsIWindowsRegKey> appKey =
+      do_CreateInstance("@mozilla.org/windows-registry-key;1");
+  if (!appKey) return NS_ERROR_FAILURE;
+
+  nsAutoString workingRegistryPath;
+
+  bool extKnown = false;
+  if (fileExt.IsEmpty()) {
+    extKnown = true;
+    // Mime type discovery is possible in some cases, through
+    // HKEY_CLASSES_ROOT\MIME\Database\Content Type, however, a number
+    // of file extensions related to mime type are simply not defined,
+    // (application/rss+xml & application/atom+xml are good examples)
+    // in which case we can only provide a generic list.
+    nsAutoCString mimeType;
+    GetMIMEType(mimeType);
+    if (!mimeType.IsEmpty()) {
+      workingRegistryPath.AppendLiteral("MIME\\Database\\Content Type\\");
+      workingRegistryPath.Append(NS_ConvertASCIItoUTF16(mimeType));
+
+      rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+                        workingRegistryPath,
+                        nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+      if (NS_SUCCEEDED(rv)) {
+        nsAutoString mimeFileExt;
+        if (NS_SUCCEEDED(regKey->ReadStringValue(u""_ns, mimeFileExt))) {
+          CopyUTF16toUTF8(mimeFileExt, fileExt);
+          extKnown = false;
+        }
+      }
+    }
+  }
+
+  nsAutoString fileExtToUse;
+  if (!fileExt.IsEmpty() && fileExt.First() != '.') {
+    fileExtToUse = char16_t('.');
+  }
+  fileExtToUse.Append(NS_ConvertUTF8toUTF16(fileExt));
+
+  // Note, the order in which these occur has an effect on the
+  // validity of the resulting display list.
+
+  if (!extKnown) {
+    // 1) Get the default handler if it exists
+    workingRegistryPath = fileExtToUse;
+
+    rv =
+        regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+                     workingRegistryPath, nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+    if (NS_SUCCEEDED(rv)) {
+      nsAutoString appProgId;
+      if (NS_SUCCEEDED(regKey->ReadStringValue(u""_ns, appProgId))) {
+        // Bug 358297 - ignore the embedded internet explorer handler
+        if (appProgId != u"XPSViewer.Document"_ns) {
+          nsAutoString appFilesystemCommand;
+          if (GetProgIDVerbCommandHandler(appProgId, appFilesystemCommand,
+                                          false) &&
+              !IsPathInList(appFilesystemCommand, trackList)) {
+            ProcessPath(appList, trackList, appFilesystemCommand);
+          }
+        }
+      }
+      regKey->Close();
+    }
+
+    // 2) list HKEY_CLASSES_ROOT\.ext\OpenWithList
+
+    workingRegistryPath = fileExtToUse;
+    workingRegistryPath.AppendLiteral("\\OpenWithList");
+
+    rv =
+        regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+                     workingRegistryPath, nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+    if (NS_SUCCEEDED(rv)) {
+      uint32_t count = 0;
+      if (NS_SUCCEEDED(regKey->GetValueCount(&count)) && count > 0) {
+        for (uint32_t index = 0; index < count; index++) {
+          nsAutoString appName;
+          if (NS_FAILED(regKey->GetValueName(index, appName))) continue;
+
+          // HKEY_CLASSES_ROOT\Applications\firefox.exe = "path params"
+          nsAutoString appFilesystemCommand;
+          if (!GetAppsVerbCommandHandler(appName, appFilesystemCommand,
+                                         false) ||
+              IsPathInList(appFilesystemCommand, trackList))
+            continue;
+          ProcessPath(appList, trackList, appFilesystemCommand);
+        }
+      }
+      regKey->Close();
+    }
+
+    // 3) List HKEY_CLASSES_ROOT\.ext\OpenWithProgids, with the
+    // different step of resolving the progids for the command handler.
+
+    workingRegistryPath = fileExtToUse;
+    workingRegistryPath.AppendLiteral("\\OpenWithProgids");
+
+    rv =
+        regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+                     workingRegistryPath, nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+    if (NS_SUCCEEDED(rv)) {
+      uint32_t count = 0;
+      if (NS_SUCCEEDED(regKey->GetValueCount(&count)) && count > 0) {
+        for (uint32_t index = 0; index < count; index++) {
+          // HKEY_CLASSES_ROOT\.ext\OpenWithProgids\Windows.XPSReachViewer
+          nsAutoString appProgId;
+          if (NS_FAILED(regKey->GetValueName(index, appProgId))) continue;
+
+          nsAutoString appFilesystemCommand;
+          if (!GetProgIDVerbCommandHandler(appProgId, appFilesystemCommand,
+                                           false) ||
+              IsPathInList(appFilesystemCommand, trackList))
+            continue;
+          ProcessPath(appList, trackList, appFilesystemCommand);
+        }
+      }
+      regKey->Close();
+    }
+
+    // 4) Add any non configured applications located in the MRU list
+
+    // HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
+    // \Explorer\FileExts\.ext\OpenWithList
+    workingRegistryPath = nsLiteralString(
+        u"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\");
+    workingRegistryPath += fileExtToUse;
+    workingRegistryPath.AppendLiteral("\\OpenWithList");
+
+    rv =
+        regKey->Open(nsIWindowsRegKey::ROOT_KEY_CURRENT_USER,
+                     workingRegistryPath, nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+    if (NS_SUCCEEDED(rv)) {
+      uint32_t count = 0;
+      if (NS_SUCCEEDED(regKey->GetValueCount(&count)) && count > 0) {
+        for (uint32_t index = 0; index < count; index++) {
+          nsAutoString appName, appValue;
+          if (NS_FAILED(regKey->GetValueName(index, appName))) continue;
+          if (appName.EqualsLiteral("MRUList")) continue;
+          if (NS_FAILED(regKey->ReadStringValue(appName, appValue))) continue;
+
+          // HKEY_CLASSES_ROOT\Applications\firefox.exe = "path params"
+          nsAutoString appFilesystemCommand;
+          if (!GetAppsVerbCommandHandler(appValue, appFilesystemCommand,
+                                         false) ||
+              IsPathInList(appFilesystemCommand, trackList))
+            continue;
+          ProcessPath(appList, trackList, appFilesystemCommand);
+        }
+      }
+    }
+
+    // 5) Add any non configured progids in the MRU list, with the
+    // different step of resolving the progids for the command handler.
+
+    // HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
+    // \Explorer\FileExts\.ext\OpenWithProgids
+    workingRegistryPath = nsLiteralString(
+        u"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\");
+    workingRegistryPath += fileExtToUse;
+    workingRegistryPath.AppendLiteral("\\OpenWithProgids");
+
+    regKey->Open(nsIWindowsRegKey::ROOT_KEY_CURRENT_USER, workingRegistryPath,
+                 nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+    if (NS_SUCCEEDED(rv)) {
+      uint32_t count = 0;
+      if (NS_SUCCEEDED(regKey->GetValueCount(&count)) && count > 0) {
+        for (uint32_t index = 0; index < count; index++) {
+          nsAutoString appIndex, appProgId;
+          if (NS_FAILED(regKey->GetValueName(index, appProgId))) continue;
+
+          nsAutoString appFilesystemCommand;
+          if (!GetProgIDVerbCommandHandler(appProgId, appFilesystemCommand,
+                                           false) ||
+              IsPathInList(appFilesystemCommand, trackList))
+            continue;
+          ProcessPath(appList, trackList, appFilesystemCommand);
+        }
+      }
+      regKey->Close();
+    }
+
+    // 6) Check the perceived type value, and use this to lookup the
+    // perceivedtype open with list.
+    // http://msdn2.microsoft.com/en-us/library/aa969373.aspx
+
+    workingRegistryPath = fileExtToUse;
+
+    regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, workingRegistryPath,
+                 nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+    if (NS_SUCCEEDED(rv)) {
+      nsAutoString perceivedType;
+      rv = regKey->ReadStringValue(u"PerceivedType"_ns, perceivedType);
+      if (NS_SUCCEEDED(rv)) {
+        nsAutoString openWithListPath(u"SystemFileAssociations\\"_ns);
+        openWithListPath.Append(perceivedType);  // no period
+        openWithListPath.AppendLiteral("\\OpenWithList");
+
+        nsresult rv = appKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+                                   openWithListPath,
+                                   nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+        if (NS_SUCCEEDED(rv)) {
+          uint32_t count = 0;
+          if (NS_SUCCEEDED(regKey->GetValueCount(&count)) && count > 0) {
+            for (uint32_t index = 0; index < count; index++) {
+              nsAutoString appName;
+              if (NS_FAILED(regKey->GetValueName(index, appName))) continue;
+
+              // HKEY_CLASSES_ROOT\Applications\firefox.exe = "path params"
+              nsAutoString appFilesystemCommand;
+              if (!GetAppsVerbCommandHandler(appName, appFilesystemCommand,
+                                             false) ||
+                  IsPathInList(appFilesystemCommand, trackList))
+                continue;
+              ProcessPath(appList, trackList, appFilesystemCommand);
+            }
+          }
+        }
+      }
+    }
+  }  // extKnown == false
+
+  // 7) list global HKEY_CLASSES_ROOT\*\OpenWithList
+  // Listing general purpose handlers, not specific to a mime type or file
+  // extension
+
+  workingRegistryPath = u"*\\OpenWithList"_ns;
+
+  rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+                    workingRegistryPath, nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_SUCCEEDED(rv)) {
+    uint32_t count = 0;
+    if (NS_SUCCEEDED(regKey->GetValueCount(&count)) && count > 0) {
+      for (uint32_t index = 0; index < count; index++) {
+        nsAutoString appName;
+        if (NS_FAILED(regKey->GetValueName(index, appName))) continue;
+
+        // HKEY_CLASSES_ROOT\Applications\firefox.exe = "path params"
+        nsAutoString appFilesystemCommand;
+        if (!GetAppsVerbCommandHandler(appName, appFilesystemCommand, false) ||
+            IsPathInList(appFilesystemCommand, trackList))
+          continue;
+        ProcessPath(appList, trackList, appFilesystemCommand);
+      }
+    }
+    regKey->Close();
+  }
+
+  // 8) General application's list - not file extension specific on windows
+  workingRegistryPath = u"Applications"_ns;
+
+  rv =
+      regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, workingRegistryPath,
+                   nsIWindowsRegKey::ACCESS_ENUMERATE_SUB_KEYS |
+                       nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+  if (NS_SUCCEEDED(rv)) {
+    uint32_t count = 0;
+    if (NS_SUCCEEDED(regKey->GetChildCount(&count)) && count > 0) {
+      for (uint32_t index = 0; index < count; index++) {
+        nsAutoString appName;
+        if (NS_FAILED(regKey->GetChildName(index, appName))) continue;
+
+        // HKEY_CLASSES_ROOT\Applications\firefox.exe = "path params"
+        nsAutoString appFilesystemCommand;
+        if (!GetAppsVerbCommandHandler(appName, appFilesystemCommand, false) ||
+            IsPathInList(appFilesystemCommand, trackList))
+          continue;
+        ProcessPath(appList, trackList, appFilesystemCommand);
+      }
+    }
+  }
+
+  // Return to the caller
+  *_retval = appList;
+  NS_ADDREF(*_retval);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMIMEInfoWin::IsCurrentAppOSDefault(bool* _retval) {
+  *_retval = false;
+  nsCOMPtr<nsIFile> defaultApp = GetDefaultApplication();
+  if (defaultApp) {
+    // Determine if the default executable is our executable.
+    nsCOMPtr<nsIFile> ourBinary;
+    XRE_GetBinaryPath(getter_AddRefs(ourBinary));
+    bool isSame = false;
+    nsresult rv = defaultApp->Equals(ourBinary, &isSame);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    *_retval = isSame;
+  }
+  return NS_OK;
+}