diff -r 000000000000 -r 6474c204b198 uriloader/exthandler/win/nsOSHelperAppService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uriloader/exthandler/win/nsOSHelperAppService.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+/* -*- 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/. */
+
+#ifndef nsOSHelperAppService_h__
+#define nsOSHelperAppService_h__
+
+// The OS helper app service is a subclass of nsExternalHelperAppService and is implemented on each
+// platform. It contains platform specific code for finding helper applications for a given mime type
+// in addition to launching those applications.
+
+#include "nsExternalHelperAppService.h"
+#include "nsCExternalHandlerService.h"
+#include "nsMIMEInfoImpl.h"
+#include "nsCOMPtr.h"
+#include <windows.h>
+
+#ifdef _WIN32_WINNT
+#undef _WIN32_WINNT
+#endif
+#define _WIN32_WINNT 0x0600
+#include <shlobj.h>
+
+class nsMIMEInfoWin;
+
+class nsOSHelperAppService : public nsExternalHelperAppService
+{
+public:
+  nsOSHelperAppService();
+  virtual ~nsOSHelperAppService();
+
+  // override nsIExternalProtocolService methods
+  nsresult OSProtocolHandlerExists(const char * aProtocolScheme, bool * aHandlerExists);
+  nsresult LoadUriInternal(nsIURI * aURL);
+  NS_IMETHOD GetApplicationDescription(const nsACString& aScheme, nsAString& _retval);
+
+  // method overrides for windows registry look up steps....
+  already_AddRefed<nsIMIMEInfo> GetMIMEInfoFromOS(const nsACString& aMIMEType, const nsACString& aFileExt, bool *aFound);
+  NS_IMETHOD GetProtocolHandlerInfoFromOS(const nsACString &aScheme, 
+                                          bool *found,
+                                          nsIHandlerInfo **_retval);
+
+  /** Get the string value of a registry value and store it in result.
+   * @return true on success, false on failure
+   */
+  static bool GetValueString(HKEY hKey, const char16_t* pValueName, nsAString& result);
+
+  // Removes registry command handler parameters, quotes, and expands environment strings.
+  static bool CleanupCmdHandlerPath(nsAString& aCommandHandler);
+
+protected:
+  nsresult GetDefaultAppInfo(const nsAString& aTypeName, nsAString& aDefaultDescription, nsIFile** aDefaultApplication);
+  // Lookup a mime info by extension, using an optional type hint
+  already_AddRefed<nsMIMEInfoWin> GetByExtension(const nsAFlatString& aFileExt, const char *aTypeHint = nullptr);
+  nsresult FindOSMimeInfoForType(const char * aMimeContentType, nsIURI * aURI, char ** aFileExtension, nsIMIMEInfo ** aMIMEInfo);
+
+  static nsresult GetMIMEInfoFromRegistry(const nsAFlatString& fileType, nsIMIMEInfo *pInfo);
+  /// Looks up the type for the extension aExt and compares it to aType
+  static bool typeFromExtEquals(const char16_t* aExt, const char *aType);
+
+private:
+  IApplicationAssociationRegistration* mAppAssoc;
+};
+
+#endif // nsOSHelperAppService_h__