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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?

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    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

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

Show warning before changing an extension

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