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>   ;; This package helps you explore differences between files, using the
>   ;; UNIX command diff(1).  The commands are `diff' and `diff-backup'.
>   ;; You can specify options with `diff-switches'.
> 
> So, altough diff.el is standard emacs, it is based on the external
> program diff, which is standard on Unix varieties, but obviously not
> on Win XP. 

A lot of unix tools has been natively ported to Windows:

http://unxutils.sourceforge.net/

Works extremely well and no need for cygwin-dlls and stuff.