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

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. – Mateusz Szlosek Aug 20 '14 at 12:52
up vote 36 down vote accepted

Uncheck Show warning before changing an extension in Finder preferences / Advanced (+,)

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