Looking again at the Apple pages, I think that it's just badly worded and the "win or Mac" option refers to the codec, not the OS (ie either codec will work on a Mac system). I'm thinking that .divx isn't playable on QT on a PC, only on a Mac.
Most of the threads seem to assume that the apple page refers to OS but I don't think it does.
I renamed a divx file to mp4 and that didn't work although both extensions played on VLC player.
I think you are right to convert the file to something that will play on your TV. Retain the original for PC use (to keep the quality).
Always handy to have the following on your PC.
Gspot and MedaiTab.
You can, at least, find the exact codecs used rather than just what the extension says the container (divx, mp4, avi etc) is.
http://mediatab.co.cc/descargar.php
http://www.headbands.com/gspot/
At least you can look for a specific codec rather than a general one.
Fortunately, the only apples (apart from QT) I have are in the fruit bowl.
