How to Show File Extensions On All Items In The Mac OS X Finder

A file extension is a group of letters that appear as a suffix to a file name and help you determine the type of file and what programs can be used to open that specific file. By default, the Mac OS X operating system hides all file extensions. OS X allows you to show file extensions for individual files or all files at once from the Mac Finder.

Instructions

    • 1

      Click "Finder" from the top menu and then select "Preferences" from the drop-down menu.

    • 2

      Click the "Advanced" tab in the Finder Preferences window.

    • 3

      Check the box next to "Show all file extensions."

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