Heh, oops, I should pay more attention to what forum I'm inmrbond113 said:This new renderer is for Unreal Gold, and as such, there is no option for "Show all Devices".
Open your Unreal\System\Unreal.ini file (don't know if the INI was renamed in Unreal Gold), look for the section labeled [Engine.Engine], and look for the line that starts with GameRenderDevice (probably the first one in that section). Change that line so that it reads
GameRenderDevice=OpenGLDrv.OpenGLRenderDevice
to select the OpenGL driver.