Windows diff closes instantly

[dylnmc]

pre-disclaimer: I know you don't like or want to work with Windows (neither do I), but this is the issue that I am encountering with VIM - Vi IMproved 8.1 (Included patches: 1-500)/MS-Windows 32-bit GUI version with OLE support at work.

Problem

Keys

1. :MundoToggle
2. 20j
3. d

Result

Mundo closes the __Mundo__ window, but there is no diff.

It looks like (when I don't have guioptions+=!) that cmd prompt opens up quickly and exits. Maybe I am missing an external command like diff of something? However, when I open a cmd.exe and type which diff, I get /usr/bin/diff back.

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Thanks for mundo. There are some very cool features in here (searching diffs with /, eg).