--- a/dom/media/platforms/PDMFactory.cpp
+++ b/dom/media/platforms/PDMFactory.cpp
@@ -41,20 +41,16 @@
 #include "AgnosticDecoderModule.h"
 #include "EMEDecoderModule.h"
 
 #include "DecoderDoctorDiagnostics.h"
 
 #include "MP4Decoder.h"
 #include "mozilla/dom/RemoteVideoDecoder.h"
 
-#ifdef XP_WIN
-#include "mozilla/WindowsVersion.h"
-#endif
-
 #include "mp4_demuxer/H264.h"
 
 #include <functional>
 
 namespace mozilla {
 
 extern already_AddRefed<PlatformDecoderModule> CreateAgnosticDecoderModule();
 extern already_AddRefed<PlatformDecoderModule> CreateBlankDecoderModule();
@@ -363,24 +359,17 @@ PDMFactory::CreatePDMs()
 #ifdef MOZ_WIDGET_ANDROID
   if(MediaPrefs::PDMAndroidMediaCodecPreferred() &&
      MediaPrefs::PDMAndroidMediaCodecEnabled()) {
     m = new AndroidDecoderModule();
     StartupPDM(m);
   }
 #endif
 #ifdef XP_WIN
-  if (MediaPrefs::PDMWMFEnabled() && IsVistaOrLater()) {
-    // *Only* use WMF on Vista and later, as if Firefox is run in Windows 95
-    // compatibility mode on Windows 7 (it does happen!) we may crash trying
-    // to startup WMF. So we need to detect the OS version here, as in
-    // compatibility mode IsVistaOrLater() and friends behave as if we're on
-    // the emulated version of Windows. See bug 1279171.
-    // Additionally, we don't want to start the RemoteDecoderModule if we
-    // expect it's not going to work (i.e. on Windows older than Vista).
+  if (MediaPrefs::PDMWMFEnabled()) {
     m = new WMFDecoderModule();
     RefPtr<PlatformDecoderModule> remote = new dom::RemoteDecoderModule(m);
     StartupPDM(remote);
     mWMFFailedToLoad = !StartupPDM(m);
   } else {
     mWMFFailedToLoad = MediaPrefs::DecoderDoctorWMFDisabledIsFailure();
   }
 #endif