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VLC (initially VideoLAN Client) is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

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Main Program & Download Page

I used this myself the other day to play back a file that was obtained via bit torrent and its the only player that worked so It,s got a big thumbs up from me
The file was a divx encoded type that seemed to be running a little fast on normal playback. Not any more,
thanx ADI