Depends what kind of AVI it is. AVI and MOV are just "wrappers" for content, which can be compressed with different codecs. If your Mac can read it, you can transcode AVI to MOV using iMovie . . . I don't use Quicktime on the PC, but that should work as well-- you mentioned "free" and I don't know whether you have to pony up the $29 for Quicktime Pro to do the conversion . . .