http://bugs.winehq.org/show_bug.cgi?id=19686
--- Comment #4 from Ken Sharp kennybobs@o2.co.uk 2010-05-14 17:03:52 --- "If Int 31H is invoked with an function number that is not defined in this specification, the DPMI host will return the "Unsupported Function" error code 8001H."
http://www.delorie.com/djgpp/doc/dpmi/api/errors.html