[koenigdavidmj]

I can't answer the compiler question specifically, but based on using some of those products (at least Office 98), I think they ported a fairly large subset of whatever API they were using on Windows. Most of the controls were almost identical to Office 97 on Windows, except for things like the Mac menu bar. Office 97 also allowed the customization of the order of menu bar items; the Mac version retained these options, but they never actually worked.