Quicktime Player 10.0 won't open mp4 files-Help, ASAP!

Error message: "The document “[x].mp4” could not be opened. The movie is not in a format that QuickTime Player understands."
YIKES!
I'm just trying to play the danged file in Quicktime. Nothing fancy. The file plays fine on a G5 system running 10.5 8 (with QT 7.x), but I need to make a presentation with the laptop running 10.6. This is the first time that I have tried to play a mp4 file with the Player. It's possible that I have been able to play mp4s previously, using another program (under OS 10.6), but I don't recall. All recent software updates installed.
Hello, Apple?
Thanks
Macbook Pro 2.5GHz OS 10.6.2
Macbook 2.0GHz OS 10.6.2
iMac G5 2.0GHz 10.5.8

If you did an upgrade install QT7 gets moved to the Utilities folder, and if you had QT7 Pro, you'll still have it and the QT7 player in the Utilities folder will have all your old features.
That said, there's no reason why, if one has both Flip4Mac and Perian, you shouldn't be able to play most anything in QTX. At any rate, my QTX certainly plays mp4 files without any problem. However the largest mp4 I have handy is about 50MBs, so I can't check to see if size is a problem. I don't know why it would be though.
Francine
Francine
Schwieder

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