AVI playback on QT wont work!

Posted:
in Genius Bar edited January 2014
I have done all the upgrades and have QT 6.4 pro. I have noticed now that certain files wont play on QT. I get an error saying that "the required compressor could not be found". Can someone help? A few are MPEGS but the current need is to get an .avi file to play. Thanks!
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