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Is it necessary to install Cygwin (which includes diff) or MinGW (which presumably also does) for something as simple as determining the differences between foobar.txt and foobar.txt~?

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You don't need those long as you have a diff.exe program, such as the GNUWin32 diff-utils version, in your PATH. Emacs itself doesn't include the mechanics for performing the diffs.

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