Error message can't open image... it is being used by M OS X what does that mean

I have some photos and videos on my macbook when I try to open them I get an error message that say movie.avi is used by Mac OS X and can not be opened.
What does this mean and is there some way I can view the video or photo or burn it to a cd and then view it?

Well I will never know what happened with that file. I tried moving it again and got the error message again. Got another message after that saying do you want to continue to move items you can move (though this was the only file I was trying) I said continue and then the file disappeared off my system.
No idea what happened with it.....

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