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I believe it's the fried-egg skybox. That would require editing either the mission files themselves to make them point to the same skybox, or copy-pasting the sky in place of the old sky images. The files may have to have the same names as the skies you are replacing. Since you have IE you must be running the Windows version, and I do not know whether or not the anti-hack system will cry foul to that. It will if you edit the missions, however.