Turn vertex shaders off.

[Advantech]

I want to use iz3d with this game but unfortunately it doesn't work with vertex shaders, see here:

Why won't all games run in 3D?

-Most modern games are designed with 3D information included. However, some older games, or even newer ones, either do not have 3D information built in, or have been designed using shaders and vertex algorithms that cannot be easily converted to 3D by our drivers.

How do I turn them off?