If you make changes to the video.scr file you need to make sure after you set that file to read only so that the game can not undo your changes when you launch it.
I've done that, the resolution is being rejected by the game, ill set it to 5040x1050 then set to read-only, launch the game and it still won't work, i close the game check the video.scr file to check if the game over wrote the settings and it didn't. That's what first led me to believe that changing the video.scr file was useless so i tried changed the resolution to 3840x1024, ran the game again and it accepted that resolution. Re-edited the video.scr file again to 5040x1050, ran the game, resolution rejected again.