VxD

From ReactOS

VxD is the short form of 'virtual device driver'. This sort of drivers are used in Microsoft Windows 95 and it's successors Windows 98 and Windows ME. This Operating Systems are based on DOS. Virtual device drivers however are not using DOS, they are using an interface given by Windows and so they are fully 32-bit. ReactOS will never support this kind of drivers, it goes for the better Windows NT/Windows 2000/Windows XP ones.