How to make extensions visible for all files

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How to make extensions visible for all files

By default, Windows is configured to hide filename extensions, the (usually three-leter) portion of the filename following the period. Aside from creating a knowledge gap between experienced and inexperienced users, this "feature" also can make it difficult to differentiate files with the same filename prefix.
Overall, hiding filename extensions makes Windows more difficult to use.

Open My Computer, and select Folder Options from the Tools menu.
Click on the View tab, turn off Hide file extensions for known file types, and press OK.