Yea wouldn't be hard to implement.
Simply a matter of making the HKCR/.ext point to something like
MediaCenter.ext
And giving them appropirate descriptions.
I'd prefer just
MP3 Format Sound or
AVI Video or
Ogg Vorbis Stream (it can be audio or video so stream is better)
Full descriptions are ok too tho
MPEG Layer-3 Format Sound
Audio/Video Interleaved
Looks best to list the extention first, then description for sorting. The words "media center" or "file" are superfluous.. We bought media center, we know it plays our files, and we know that they are files.
So many programs grab and handle this part of the registry so badly that I just do it myself now. I edit the registry myself and make them read only to prevent any program from ever changing them. The problem with MC is that it uses a very nonstandard shell ingration scheme that had some changes recently.
IE: Try to open a file with media center.exe using standard input, does not work. It then adds a open with entry that doesnt work either, and u notice there are 2 entries. Media center.exe and MC11.exe, which is placed in your system directory for some odd reason. That links files to MC's input so they load correctly.
Another fix would be to add Media Center.exe to HKCR\Applications and set a string named NoOpenWith, to clean up the users openwith list on XP.