You need some codecs for the files to play properly.

For WMP try K-Litecode Codec Pack or XP Codec Pack 2.0.6.

Or try using VLC media player, it has the codecs built in and will play most file types. It's a good player to have around as a backup.

See: CODECs list for Movies/Alternate players / Video help forums/ video-mp3 fixers

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