If you mix a lot of files on your Mac, you might get annoyed with the question, “Are you sure you want to change the extension?” Warning that appears whenever you try to rename a file’s extension in the Finder. Fortunately, this warning is easy to turn off. Here is how.
First, click the Finder icon in your Dock to bring it to the front.
Click on Finder in the menu bar at the top of your screen. In the menu that appears, choose Settings. (Or you can press Command + Comma on your keyboard.)
In the “Finder Preferences” click on the “Advanced” button in the toolbar.
In the “Advanced” Finder Settings section, uncheck the box next to “Show a warning before an extension is changed”.
It’s that simple. Close the Finder Preferences window and the next time you change a file extension in the Finder, you will no longer see a warning. Fast fast!
By the way, if you always want to see file extensions on Mac, just go to Finder Preferences> Advanced and turn on Show All Filename Extensions. You’ll be flinging files like a pro in no time.
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