Who knows, did you try
http://xbox-scene.com/? Look in the forums there.
I'm still happy with my regular old xbox, it is still the best multi-media center EVER!
http://sourceforge.net/projects/xbmc I haven't seen a media format it can't play. Plays all media anywhereI just wish it had a gigabit ethernet adapter in it, as some huge media files lag a bit on a regular 100mb network.