Final Cut Pro 6.0.2 requires QuickTime 7.3. If you open Final Cut Pro 6.0.2, and you don't have QuickTime 7.3 or later, you will see an alert message, such as the following:
Note: If you previously updated to QuickTime 7.3, and then upgraded your computer from Mac OS X 10.4 Tiger to Mac OS X 10.5 Leopard, it's possible that QuickTime 7.2.1 may have been installed with Leopard, and you will need to update QuickTime to 7.3 again.
Choose Software Update from the Apple menu to update to QuickTime 7.3 or later. Alternately, you can download QuickTime from the QuickTime Web site.