http://bugs.winehq.org/show_bug.cgi?id=30301
--- Comment #3 from Eldmannen Eldmannen+wine@gmail.com 2012-03-29 09:53:02 CDT --- (In reply to comment #1)
(In reply to comment #0)
Why does Wine come with built-in clones of Windows software components such as Notepad, Wordpad, Internet Explorer, etc?
Generally because applications expect those to be present and try to directly start e.g. notepad or iexplore.
Then those should be links or redirects to xdg-open.