When you try to rename the file, is the file extension showing?
For example, if you are trying to rename the file test.txt is the filename displayed as "test" or "test.txt" ?
I think you should try this. Open up Windows Explorer and go the file which you would like to rename. On the Menu Bar go to Tools, Folder Options, then the View tab, and look for the option that says "Hide extensions for known file types" and uncheck that box. This will allow you to right click the file and rename it with a new extension.
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