In order to achieve backwards compatibility, DirectX in Windows Vista contains several versions of Direct3D: Direct3D 9: emulates Direct3D 9 behavior as it was on Windows XP.
Aby se dosáhlo zpětné kompatibility, DirectX ve Windows Vista obsahují několik verzí Direct3D: Direct3D 9: emuluje chování Direct3D 9 tak, jak to bylo ve Windows XP.