The new version of Snow Leopard with Quick Time Player X does not open old panoramafoto files of Quick Time player 7 with the suffix *.mov as made up with PTGui for example.
After having installed Snow Leopard with the installation disk, reopen the disk and install Quick Time 7 from the map optional installations. It will be placed to the map helpprograms in the map programs. You can run both versions on the computer. I have tried it yesterday.