1. Locate your save game folder. Saved games are located under the default folder:
- In Win XP: C:\Documents and Settings\<USERNAME>\Application Data\Ubisoft\Assassin's Creed Brotherhood
3. Edit the DisplayWidth and DisplayHeight lines according to your desired resolution. Save and close the file.
*For the best experience, run the game in a 1024x768 or higher resolution. Check your monitor's documentation to ensure supported resolutions before changing this setting.