New Post: Files processed through WTV profile not playing on Xbox 360 extender

Okay so folks who are having issues with playing back MCEBuddy created WTV files on 64 bit Windows (7 and 8). Thanks for Mark for this answer:

Open FFDShow 64bit Video Configuration from the Start Menu -> ffdshow (assuming you let MCEBuddy install FFDSHOW).
Under MPEG-2 and MPEG2 in AVI set it codec to libavcodec.

It should solve your problem. (maybe a reboot is required).