One thing I've run into in porting QuickTime movies from Macs to PCs - the resource fork thing. I've created QuickTime animations in Macromedia Director MX. Found that I had to get ahold of software that will strip out (or flatten) the extra resource forks Mac OS uses in its file structures. This may be different with Carrara; I don't know. Just thought I'd share the wisdom of three days' pain... :P