If you are also playing the sequel, the Settlers 4 Widescreen Tool is much more robust, supporting up to 1920x1200.
If you prefer not to use third-party launchers, you can manually patch the game's executable using a hex editor, though this has stability limits. settlers 3 widescreen
: Includes the original game, Mission CD, and Quest of the Amazons. If you are also playing the sequel, the