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First thing I would do is make several copies and save them to various places on your computer, JIC. Then you are going to want to tell us if the file has an extension, what that is. If it doesnt, I would start opening it with programs such as winrar or winzip or something like that. Its kind of hard without more information, but Vista might have tried to backup whatever it was fixing to an archive, which is my best guess without better info.
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