OK, I downloaded OpenGL ExtensionsViewer, and expanded all the "supported" sub-lists. Then I opened regedit in wine, navigated to HKCU/Software/wine and created a new key,"OpenGL." Within this Key I created a new String Value (REG_SZ) called "DisabledExtensions." I right-clicked this new String Value and chose Modify. In the available entry field I then entered every OpenGL extension listed by OpenGL Extensions Viewer as being "Supported," and which was part of OpenGL 1.5 or older. I separated them with a single space. This amounted to 42 separate, space-separated values. I closed regedit. I ran wine WolfSP.exe. Unfortunately, I still receive the same error :( Have I made a mistake somewhere? Regards, S.