Quicktime render on Mac won't play on PC

[cupcakes]

I've done a quick search and didn't turn up any useful info on this;
so apologies if it's a common question and I've missed it somehow.

We have rendered some Quicktime movies using Bryce 3D on a Macintosh.
They refuse to play or convert on a WindowsXP machine. It's
subsequently been updated to the latest windows QT player (v6.5.1) and
this hasn't made any difference.

The exact error message is "Couldn't open the file "test.mov" because
it is not a file that QuickTime understands"

Any advice on a solution, or tools to analyse the MOV files would be
appreciated. I've tried GSpot and RAD Video Tools, neither were any
help.

When we have access to the Mac again we'll do some tests and post
anything useful we find.