No personal experience, but this is from Tweakguides.com:
Vidmode.ini
This .ini file can be found in your Program FilesLucasArtsStar Wars BattlefrontGameDataData_LVL_PC directory. You can edit it using Notepad or Windows Wordpad, but make sure to back it up first before making any changes.
1280 1024 0 0 1
In the Vidmode.ini file you will find a list of numbers. The first two numbers on each line correspond to a list of resolutions supported on your machine (width and height). I believe the next number is the level of supported Antialiasing for that particular resolution, and the last number is whether the resolution itself is supported or not on your machine (1 meaning supported, 0 meaning not). I am unclear as to what the middle number represents - it may well be the texture filtering mode.