Game Setup
The setup.exe that is created in your compiled folder along with your game executable can be used to change the screen mode (windowed/full-screen), resolution, sound, and other settings of the game engine.
320*200 is what the game engine reverts to if no config file is present. Even if the game is a 640x400 game [1]
[calling "game.exe --setup"] is all that the winsetup.exe program does.