WinDOS is also a name that has been applied to a number of programs over the years, the first of which popped up in the days of Windows 3.1.
Most of them provide(d) a Windows-like GUI for DOS, or increased DOS compatibility in Windows. On the whole, they tend to be pretty pointless programs.
Two programs named WinDOS can be found at http://www.spaceports.com/~ande/windos.html and http://come.to/windos.