Why doesn Virtual U run on Windows NT?
In order to display its graphics, Virtual U uses a special graphical programming API (application programming interface) known as DirectX. Windows NT is only compatible with DirectX 3.0 while Virtual U requires DirectX 6.1 or higher. Because Microsoft never updated DirectX for the NT platform, Virtual U doesn’t work with Windows NT. Windows 2000, the upgrade to Windows NT, supports DirectX 7 and higher and thus is compatible with Virtual U.