Is it actually DivX 6.0, somenumber x somenumber, Millions something Stereo 48.000 kHz What's the "something" before Stereo? The fact that it says Stereo and the sample rate would indicate that it recognizes the sound format. So that leaves the usual suspects: check the volume, do other...
MOV and AVI are both container formats, which support a variety of video and audio codecs; unlike MPG and WMV, which says something about the type. (All AVIs should have a QuickTime icon, because that's the app that will try to play them. Installing Flip4Mac does the same for WMV.) In the...