It makes sense that QT Pro should be able to play the AVI file, even though the standard non pro informs me that a compression plug in is missing. I will need to edit and save limited sections of films for design and entertainment content, so I am looking into whether QT Pro can give me that capability (say as in iMovie, where one can export a clip to QT), which appears to be at best far too complicated for a non technical type in VLC.