QT won't open mp4

When I try to open an mp4 file, I get the message: The movie is not in a format that QuickTime Player understands.
Then I go to the page that supposedly "tells me more" and it clearly says QT will open mp4 files.
Anyone know what's going on?
Thanks,
Paul
10.6.8
QT 10.0

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Did you repair permissions (and I know you didn't)?
If not, do that.
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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.
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get error message:
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QT won't open mp4

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