Have you found if PS CS 5.1 Extended can not open QT files that are more than 10mb? This has been my experience. Since I can open (as smart objects) the smaller QT files, I reckon it's not a codec problem. My machine is 64bits, 8Gb RAM. Any suggestions?
And on a side note: Why is it that the CS Premium Suite. 5.5 I have installed has a Photoshop version 5.1 when every other program in there is 5.5?
Also, do you know why I have two Photoshops in my Start Menu? One says "(64bits)."
OK, I know that's a lot. Mostly I'm concerned with the first one: not opening QT files.