Function d3d9_mtld3d 

pub fn d3d9_mtld3d() -> Rule

mtld3d for D3D9 in every process.

D3D9 goes through mtld3d, which translates it to Metal directly, instead of through wined3d, for the same reason as dxgi_dxmt. A rule for one program with d3d9 = wined3d gives it wined3d, and a * rule with it gives every process wined3d.