If you're on the WIN platform, there is a problem feature with the manner windows explorer handles the preview of the "selected" file in your folder view...

So far it has been a "round-and-round" between Adobe and Microsoft as to who needs to fix it. The only offered solution/workaround is to (re)name/"save-as" the file and then toss the other out. It also won't let you toss it out until you've restarted most times... A bit of a pisser, but you're not the only one this has happened to.

What flavour OS are you running. I've had this happen in Win2000 and on a co-workers XP.

:)
retrocity