I only edit uncompressed QT.mov files, as it's not a good idea to edit a compressed file IMVHO, due to image loss, artifacts and the possiblility that the codec creates reference frames from which succeeding frames are derived. however, cs3 allowed me to import a vob file, which is mpeg2 (compressed video), so I reckon it may allow the import of other codecs. but I dunno if QT is worth the trouble on an XP machine, or even if it will work at all on a vista machine. I've heard that QT causes all kinds of conflicts with 3D software under XP. perhaps adobe will need to get their butts in gear and take care of that.