3D GameStudio A6 6.31 requires DirectX 9.0c.

Also, in SED, you can set the directory that the bin directory are located in. So you should have it as:

C:\Program Files\GStudio6\

instead of:

C:\Program Files\GStudio6\Bin

since SED looks in the Bin folder from the GStudio6 directory (or whether you install 3DGS in).

I hope this helps.