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How to show or hide known file extensions in Windows 10

There are times we might need to see what file type our files are. Revealing their extension (the 3 letters after the dot ".") can help us see what kind of file our video is for instance, or even changing the extension by renaming it.

In this video, we dig into Folder Options to see how we can reveal or hide the file type extensions, in Windows 10.


  1. If you have a folder window open, navigate to the View tab and click on Options button. Otherwise, type Folder Options on the Taskbar search box, and click on File Explorer Options.
  2. Navigate to the View tab.
  3. Uncheck the Hide extensions for known file types option to reveal the extensions. Check (enable) the option again to hide the extensions.
  4. Click the OK button.

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