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Originally Posted by gazzae
There is an option in windows to show file extensions.
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I've always thought it's an extremely poor choice on M$' part not to have the "Hide file extensions for known file types" option unselected by default, just in case it upsets the hoi polloi who might not even be able to handle that little piece of information.
Quite apart from the usefulness of being able to see the actual file type, how about the uncounted numbers of viruses and worms that have been activated because the recipient just saw .jpg or .txt etc on the end of a file name, and didn't see the .exe extension at the end that Windows had so thoughtfully hidden?
Go into My Computer or Windows Explorer, Tools -> Folder Options -> View, untick Hide file extensions for known file types and click OK. It will not hurt your system, and next time a file comes along with a dodgy extension, you'll see it.