By default, file extensions are not displayed in Windows 10. For instance, the file mspaint.exe display as mspaint in File Explorer.

To view file extensions, follow the steps below.

  • Open a new File Explorer window by pressing Windows key+E (hold down the Windows key on your keyboard and press E).

  • Select the View tab.

  • Check the box labeled File name extensions.

  • How to view hidden files and folders in Windows.
  • How to stop viewing hidden files in Windows.