When renaming a file in the Finder and changing the file extension, I get the following confirmation dialog warning message:

Are you sure you want to change the extension from ".md" to ".txt"?

If you make this change, your document may open in a different application.

How can I disable it?

  • 7
    Tip: when You want to make screenshot of a window press CMD+SHIFT+4 and hit space. Commented Aug 20, 2014 at 12:52

1 Answer 1


Finder > Preferences > Advanced (⌘ ,), then uncheck

Show warning before changing an extension

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .