I had to perform a system recovery on my computer and after reinstalling everything i can no longer add .mp4 and .mkv files to the wmp library so i can stream them from my xbox 360. I've tried several different codec packages including the one on my laptop (which works fine with .mp4 and xbox) and nothing is working. i can play these files individually but can't add them to the library or playlist.
I've tried k-lite codec full
shark 007 vista codec 5.01.1
windows essential codec pack
ffdshow seperate install.

before i install one pack, i'll uninstall the other and clean out the registry with registry mechanic. After none of these worked i've also tried to add registry entries manually, but i know that you shouldn't have to do this with these codec packs. Again my laptop is running vista codec package 4.6.3. without any problems. i think i've tried that version on my desktop too. Any help would be greatly appreciated

[HKEY_CLASSES_ROOT\.mp4]
"PerceivedType"="video"
"Content Type"="video/mp4"

[HKEY_CLASSES_ROOT\.m4v]
"PerceivedType"="video"
"Content Type"="video/mp4"

[HKEY_CLASSES_ROOT\.m4a]
"PerceivedType"="audio"
"Content Type"="audio/mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\MIME Types\video/mp4]
@="mp4file"
"UserApprovedOwning"="yes"
"Extensions.SpaceSep"=".mp4 .m4v"
"Extensions.CommaSep"="mp4,m4v"
"Extension.Key"=".mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\MIME Types\audio/mp4]
@="mp4file"
"UserApprovedOwning"="yes"
"Extensions.SpaceSep"=".m4a"
"Extensions.CommaSep"="m4a"
"Extension.Key"=".m4a"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Groups\Video\mp4]
@="mp4file"
"Description"="Includes files with .mp4 and .m4v extensions."
"Extensions"=".mp4 .m4v"
"FriendlyTypeName"="MPEG-4 Media File"
"MIME Types"="video/mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Groups\Audio\m4a]
@="mp4file"
"Description"="Includes files with an .m4a extension."
"Extensions"=".m4a"
"FriendlyTypeName"="MPEG-4 Media File"
"MIME Types"="audio/mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Extensions\.mp4]
"Permissions"=dword:0000000f
"UserApprovedOwning"="yes"
"Runtime"=dword:00000007
"PerceivedType"="video"
"MediaType.Description"="MPEG-4 Media File"
"Extension.Handler"="mp4file"
"Extension.MIME"="video/mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Extensions\.m4v]
"Permissions"=dword:0000000f
"UserApprovedOwning"="yes"
"Runtime"=dword:00000007
"PerceivedType"="video"
"MediaType.Description"="MPEG-4 Media File"
"Extension.Handler"="mp4file"
"Extension.MIME"="video/mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Extensions\.m4a]
"Permissions"=dword:0000000f
"UserApprovedOwning"="yes"
"Runtime"=dword:00000007
"PerceivedType"="audio"
"MediaType.Description"="MPEG-4 Media File"
"Extension.Handler"="mp4file"
"Extension.MIME"="audio/mp4"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\Player\Extensions\Descriptions]
"737"="MPEG-4 Media File (*.mp4;*.m4v;*.m4a)"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\Player\Extensions\MUIDescriptions]
"737"="MPEG-4 Media File"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\Player\Extensions\Types]
"737"="*.mp4;*.m4v;*.m4a"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\MLS\Extensions]
"mp4"="video"
"m4v"="video"
"m4a"="audio"

I'm sorry but I do not know how to fix your broken operating system.
I can only suggest a clean install of Windows on a formatted harddrive.


shark

try adding the following

[HKEY_CLASSES_ROOT\mkvfile]
@="Matroska Video File"
"PreferExecuteOnMismatch"=dword:00000001
"EditFlags"=hex:00,00,01,00

[HKEY_CLASSES_ROOT\mkvfile\DefaultIcon]
@="C:\\PROGRA~1\\WINDOW~2\\wmplayer.exe,-120"

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

[HKEY_CLASSES_ROOT\mkvfile\shell\open]
@="&Open"

[HKEY_CLASSES_ROOT\mkvfile\shell\open\command]
@="\"C:\\Program Files\\Windows Media Player\\wmplayer.exe\" /prefetch:6 /Open \"%L\""

[HKEY_CLASSES_ROOT\mkvfile\shellex]

[HKEY_CLASSES_ROOT\mkvfile\shellex\ContextMenuHandlers]

[HKEY_CLASSES_ROOT\mkvfile\shellex\ContextMenuHandlers\WMPAddToPlaylist]
@="{F1B9284F-E9DC-4e68-9D7E-42362A59F0FD}"


if it works you can do the same thing by just changing "mkvfile" to "mp4file" and "Matroska Video File" to "MPEG Video File" in the entries.