http://bugs.winehq.org/show_bug.cgi?id=18424
--- Comment #76 from david.dljunk@gmail.com 2013-02-07 06:09:04 CST --- (In reply to comment #75)
I'm not sure if the "messages" were implemented (http://msdn.microsoft.com/en-us/library/dd743594(v=vs.85).aspx) as I don't see any reference to them but also not sure if that's actually important as even possible as we have to communicate through the Linux/OS X layer anyway and they seem very limited in their functionality/age.
Never mind about this, they are there in mmsystem.h, I was just blind :)