How do I stop Finder from warning me when I change a file extension? 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?
Uncheck Show warning before changing an extension in Finder preferences / Advanced (⌘+,)