HELP! QuickTime Player says it can't read .mov files

I have .mov on an external hard drive. When I connect it to my MacBook Pro I can see all the files, which are in .mov format, but QuickTime Player says "The document “BSOL1480_01.MOV” could not be opened. The movie is not in a format that QuickTime Player understands."
How can I fix/change this?

Did you try playing the file with Quicktime 7? Do you have Perian, Flip4Mac or VLC installed?

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