Oooh, and let's not forget Microsoft Visual C++ 4.0 for Mac! http://msdn.microsoft.com/archive/en-us/dnarvc/html/msdn_mfcmac.asp
It included the "Windows Compatibility Libraries" (probably the same thing mentioned earlier as "Microsoft Wings"), "an implementation of the Windows API and architecture on the Macintosh. These libraries support most of the Windows API and will translate your Windows calls using either the appropriate Toolbox routines or native implementation."
So there you have it. Microsoft implemented Wine itself, more or less, for the Macintosh, back in '94-'95, and actually sold it as a product. (I almost picked up a copy of this at Half-Price Books in Bellevue, Wa in 1995 or so for $95, so I know it made it onto retail shelves...) - Dan
-- Wine for Windows ISVs: http://kegel.com/wine/isv