For older DirectX based applications (DX5 and earlier), Microsoft has
created a method to allow legacy Direct3d applications to use the Voodoo2 card
as the default device (as was done on Windows 9x). just as was done on Windows
9x. This is done by setting the registry key:
HKLM\Software\Microsoft\DirectDraw\EnumerateAttach edSecondaries=1. This
registry key is set by default by the Voodoo2 driver installation file. Also,
this registry key is not specific to Voodoo2, so if it is set DirectDraw
will enumerate the first secondary device as the primary DirectX device even
if that device is not a Voodoo2. In order to get the default DirectX device
enumeration policy, either delete this registry key or set it to 0.