Turning Point: Fall of Liberty

.ini (native for 1280x720 and 1680x1050, see Supported Resolutions section below)

1) First, you must start the game for the necessary user files to be created. Once at the main menu, just quit. That should be enough.
Then you have to manually enter your desired width and heigth in TPEngine.ini found in :

(XP) C:\Documents and Settings\<your username>\Local Settings\Application Data\My Games\Turning Point\TPGame\Config
(Vista) C:\Users\<your username>\AppData\Local\My Games\Turning Point\TPGame\Config

2) Search for ResX= and ResY= under [SystemSettings] and replace the values with any width and height of your liking. Save the file and you're all set.