How can I display file extensions in folders on Windows 7 (or later)?
I can't find it since I upgraded from WinXP.
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The Folder Options control panel contains an option to show/hide file extensions for known file types. By default, it's set to Hide.
To get to the control panel is simple (but slightly different in each version of Windows):
Under the View tab, there's an Advanced settings tree. You should see Hide extensions for known file types. checked in the list. Uncheck it, and click OK.