The problem with the IID_s is solved ! File-Structure: ~~~~~~~~~~~~~~~ DirectDraw.pas = DDraw.h + DVP.h (+ MultiMon.h) Direct3D.pas = D3D.h + D3DTypes.h + D3DCaps.h + D3DVec.inl + DXFile.h Direct3DRM.pas = D3DRM.h + D3DRMDef.h + D3DRMObj