Movies play in old QT versions but not now?

Hey everyone! I have a .mpg file created about 5 years ago on a G4. I recently tried opening it on my G5 with QT Version 7.5.5 but it said "This file could not be opened because it is not a movie file." When I went back to the G4 and tried opening it there with QT Version 7.1.6 it opened and played just fine. Any suggestions on how to correct this? I saw that another post said you have to enable older codecs in QT Preferences under the Advanced Tab, but when I went there for my version of QT (7.5.5) there was no Advanced Tab available. Is this a QT Pro feature? Thanks everyone!
Message was edited by: BobRob 12

You enable legacy encoders via the QuickTime System Preference pane.

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