How to open a file with a strange extension | PCWorld

How to open a file with a strange extension | PCWorld: "I doubt that anyone knows all of the file extensions used since the pre-DOS days of CP/M. Some of them may not even describe a file type. Before Windows started using them to associate files with an application, people used extensions for all sorts of things.

But that was a long time ago. Chances are that the extension on your mystery file does indeed identify a program. But how do you find what program?"

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