By default, Max OS X hides the
.png file extension of screenshots it saves to the desktop. However, I prefer to see the extensions of the files I’m working with. So after continually revealing the extension of every screenshot file manually, I decided to find a permanent solution.
To manually reveal the extension of a file, first select the file in the Finder and display the file’s Info window by typing command-I or by selecting Get Info from the File menu. Next, uncheck the Hide extension setting in the Name → Extension section. That’s it. If you apply this technique to a screenshot file on the desktop, Mac OS X reveals the file’s
.png extension. The following image shows the Info window for a screenshot file. The unchecked Hide extension setting is highlighted.
Making Mac OS X automatically reveal the extension of screenshot files requires a general solution that applies to all files. That is, Mac OS X will automatically reveal the extension of every file, not just screenshot files. Here’s how. Open the Finder’s preferences by typing command-, or by selecting Preferences from the File menu. Select the Advanced tab and check the Show all filename extensions option. Mac OS X will now reveal the extension of every file on your Mac. The following screenshot shows the Finder’s Advanced preferences tab. The checked Show all filename extensions option is highlighted.