MacOS – TextEdit keeps changing file extensions when I save

file extensionsmacostextedit

Is there a way to prevent TextEdit from changing the file extension on a file that I open it with, or at least prompt me?

Example:

  1. Open somefilename.yyy
  2. Save becomes somefilename.rtf

I have looked through TextEdit preferences without finding a setting.

Best Answer

Try with making the file to an Plain text file. It's under the Format tab (not in preferences).

Have you taken a look at this?

Apple support page

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