The same engine (ported to 32bit/Win32 and 64bit/Win64, including WDM). Windows died
after Windows version 4.90 "Millenium Edition". Windows NT is now in version 5.2
"Windows 2003". (XP is 5.1, 2000 is 5.0.) I think WinVista is Windows NT 6.0. The
stupid kernel (VMM) of Win9x/ME may not be able to support all of these graphical
features of WinVista.