I had this same issue and nothing had worked till now. But found the problem finally: Code for MGEgui.ResolutionForm has this: public static bool ShowDialog(out Point p, out int refresh, bool Windowed) { // Fetch data from the registry RegistryKey key = Registry.LocalMachine.OpenSubKey(@"Software\Bethesda Softworks\Morrowind"); But my registry entry is this: "Software\WOW6432Node\Bethesda Softworks\Morrowind" That WOW6432Node in between is causing the problem. Guess I will just have to use regedit and change the resolution for now. Update: IMGEXEGUI resolution popup started working today somehow. I am guessing this is the reason - I gave morrowind.exe admin preivilege and changed the in game resolution once. Also on a side note I am on Windows 10 not 7.