{file} is used by Mac OS X and can't be opened

This file is a video file and the lock that OS X has on it is persistent between reboots.
Anyone know how to get OS X to let go of the file and let me watch it please?
Thanks

Busta99
Thanks for the response. Indeed - I've never heard of such a thing as you describe.
Wondering: what app are you using to open this video file and what is the video file format?
What I'm thinking (just in case you haven't tried this) is that you could do a Get Info on this file and then use the "open with" dialogue to assign (or re-assign) the proper application for opening that file and all other video files with that file extension.
Just a chance that might correct the System ownership issue.
Other than that, the only alternative I can think of is to log in as Root User and go from there. I think you would then be able to play the video but you won't want to stay on as Root User - that's for certain.
While logged on as Root User, you might again try changing permissions or even try using a video conversion app to change the video file to a new format - and then rename and apply permissions.
I think the real probability isn't going to please you: I think this file is corrupted and if it's the only copy you have, it's "junk." But the above experiment would likely prove that either way.

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