I downloaded some AC3 .avi files and, of course, they won't play on WMP, although I tried installing several different filters. It's on a work PC so I can't install another video player so I'm hoping someone can suggest a video converter. I've tried Any Video Converter, but the conversions are double the size, even though I'm converting back into .avi format and the sound is tinny. I'd really appreciate any help. Thanks.