Ned Deily added the comment: There are known differences among the various Tk implementations with regard to how file extensions are handled in Tk file dialogs, like IDLE uses; see Issue4832. Can you say which version of Tk was in use (it should be in the About IDLE display) and on what platform? I was not able to reproduce this behavior on any of the current OS X IDLEs and Tks with Save As.
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