Sigh, see the paragraph starting "In 1995 Video for Windows became an issue in a lawsuit Apple filed against Microsoft"

http://en.wikipedia.org/wiki/Video_for_Windows

Im sure Bill Gates feels fine about saving Apple. The only reason Microsoft bailed out Apple was to fight the antitrust suit the U.S. government filed against it. By saving Apple, M$ could (and did) claim it still had a competitor in the market, so it wasn't a monopoly. As long as they distributed Office and IE for Mac OS, M$ could claim they weren't being anti-competitive by bundling IE with Windows and not releasing key Windows API's to 3rd party developers.