MP4 files not playing in Quicktime 7.3

Lately, I have been getting the following error when I try to play MP4 files in quicktime on my Mac:
"The movie could not be opened. Operation could not be completed. (OSStatus error -50.)"
This error also prevents me from adding the files to iTunes. The weird thing is that they play fine on a PC.
I have tried updating my Quicktime (I am running Leopard), and that did nothing.
Any ideas?

How can I tell that. I have several. I am also unable to view them in the finder window like I can other .m4v or .mov files.

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    From: [email protected]
    To: [email protected]
    Subject: HELP....AVCHD / MPEG files not playing correctly!
        Re: HELP....AVCHD / MPEG files not playing correctly!
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