.MOV file unreadable in QuickTime

Hi!
I am trying to open and read a .mov file on my computer (late 2008 2.4 Ghz Macbook running the latest Snow Leopard) and QuickTime X won't open it, telling me that it's not a format recognised by QuickTime and that I might have to download additional softwares to read it. I have tried to open the file with QuickTime 7, VLC, Final Cut Express 4, and iMovie 09 as well. I have Perian and Flip4Mac installed. Nothing works. QuickTime seems to open other .mov files without any problem.
I have checked the Info of the file and it's an HD video (1920x1080) with MPEG-2 Video, Linear PCM and Timecode as codecs.
I have thought that the MPEG-2 Playback codec could solve the problem but it seems to be for Quicktime 7 and l'm pretty sure the file could be read with QuickTime X on the original Mac Pro, though on this point I might be mistaken.
The file was transferred from a Mac Pro to my Macbook through a Western Digital My Passport (FireWire 800 and USB 2.0) external hard drive. Could the hard drive possibly have corrupted the file in one way or another? What I found odd was that the file was "locked" (with a padlock on the icon) on the hard drive and when transferred on my computer. I can unlock it in Info but I don't understand why it was locked, was it already like that on the original computer, is it something the hard drive does, and most importantly, does it have anything to do with me not being able to read it with QuickTime?
Anybody knows something that can help? Thanks!
Message was edited by: alxndralb

It doesn't. I think the problem is that i had FileVault on when the files were backed up to the Western Digital external drive. I needed to turn FileVault off because my account had reached its maximum space and I needed to raise the level. The files were backed up in encrypted mode to the WDD, then I had to delete them off the MacBook to free up space on my account to turn FileVault off (freakin stupid thing to do but that is what was required). Once FileVault was off, i tried to restore those files and now they are unreadable.
So my assessment is that they are still encrypted, but the computer doesn't know how to deencrypt to open them. Talk with Apple service today and they weren't sure if turning FileVault back on would allow me to deencrypt the files on the WDD. I tried it, nope. didn't work.
So I am stuck with 5 months of videos of my toddler son that are on my backup, but no way to bring them back in a readable format. Hence my "slightly" panicking state.
What doesn't make sense is that if you have FileVault on and you are backing up your files to an external and they are encrypted, shouldn't you be able to restore them if your computer crashed and you had to reset everything, including FileVault? So far, all the answers are "don't know, you could be screwed."
Thoughts???

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