answer:Although the QuickTime player can play .avi files, sometimes the encoder that makes the .avi is a different ‘version’ (i.e. newer, or a proprietary implementation by the manufacturer of that camera), designed to work with the ‘guts’ of that specific camera. Eventually, the software engineers at Apple will get their hands on that camera, and figure out/update QT to incorporate that encoder (aka “codec”); my new HD tapeless video camera has the same problem, only with H.264 media files. In the meantime, you could try opening the .avi with another ‘universal’ media player, such as VLC Player