Solutions
-
Highiron's post in DirectX10 for Prepar3d was marked as the answerCurrent P3D version only supports DX9. DX10 preview code was removed by L.M. because it was buggy, flawed, and incomplete and not worth the time to fix. From what I understood from L.M. comments regarding P3D v2.0 is that they where skipping DX10 and going straight to DX11.