REGEDIT4

[HKEY_CLASSES_ROOT\.mp4]
@="Mpeg4Files"

[HKEY_CLASSES_ROOT\Mpeg4Files]
@="MPEG-4 Files"

[HKEY_CLASSES_ROOT\Mpeg4Files\DefaultIcon]
@="quartz.dll,2"

[HKEY_CLASSES_ROOT\Mpeg4Files\shell]
@="play"

[HKEY_CLASSES_ROOT\Mpeg4Files\shell\open]
@="open"

[HKEY_CLASSES_ROOT\Mpeg4Files\shell\play]
@="play"

[HKEY_CLASSES_ROOT\Media Type\Extensions\.mp4]
"Media Type"="{E436EB83-524F-11CE-9F53-0020AF0BA770}"
"Subtype"="{2073346D-0000-0010-8000-00AA00389B71}"
"Source Filter"="{E436EBB5-524F-11CE-9F53-0020AF0BA770}"
"Transform Filter"="{7940950F-1E79-4dfc-B8B7-5B1989787EFA}"

[HKEY_LOCAL_MACHINE\Software\Microsoft\Multimedia\MPlayer2\Extensions\.mp4]
"Permissions"=dword:0000001F

[HKEY_LOCAL_MACHINE\Software\Microsoft\Multimedia\WMPlayer\Extensions\.mp4]
"Permissions"=dword:0000001F
"Runtime"=dword:00000007

[HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Player\Extensions\.mp4]
"Permissions"=dword:0000001F
"Runtime"=dword:00000007