http://bugs.winehq.org/show_bug.cgi?id=28798
--- Comment #9 from Juan Lang juan_lang@yahoo.com 2011-10-31 11:12:32 CDT --- (In reply to comment #7)
It appears that the app is just broken. According to tests I'm writing, nearly all Windows versions fail with this key too: only NT4 incorrectly doesn't check the size of the input buffer. What version of Windows did you try this on?
I spoke too soon: you're right, Windows accepts this key even with a small buffer, even though it doesn't accept others. Weird. More investigation needed.