How to open file extensions on MacOS, and how to check file extensions on MacOS

Each file has its extension to indicate its file format, such as MP3 for music files, MP4 for video files, and other more common extensions. Both Windows and MacOS hide common extensions, so how do you view file extensions in MacOS? We can display the file extension through the Finder preferences. The following is a tutorial on how to set the Mac to display the file extension.

The first step is to click the Finder icon at the top of the Apple Mac desktop, and then click to select "Preferences" from the menu.

Step 2. In the Finder Preferences dialog box, in the Advanced Options interface, click to check "Show all file extensions", close the settings interface, and open the Finder to see the file extensions!

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