Судя по цитате с ихфанатков ничего не выйдет

VideoMode=1280
This causes Civ to use the selected video mode. - Useful for when you don't want to play C3C at your desktop resolution or you don't want to play civ at the standard 1024x728. I haven't used this one but I assume that the video mode is set by only using the first part of the resolution choice.
Only the following resolutions are supported with this command:
1024x768
1152x864
1280x1024
1600x1200
1792x1344
Originally posted by Mike Breitkreutz FIRAXIS
OK, here's a list of all the INI settings for Conquests (some of these may not be in Civ3 or PTW). I'm not sure if these are documented anywhere or not (probably some of them are in the readme)... I just write the code.
Похоже что меньше 1024х768 не устанавливается
Да и еще, точно проверял , что невозможно выставить разрешение выше чем на рабочем столе