Support is native for 16:10 and 16:9 resolutions. Simply select and apply your desired resolution from the options menu.
For 15:9 (1280x768) and other "unusual" resolutions, you'll have to
delete My DocumentsMy GamesRed Faction GuerrillaOptions. The game will then run at your desktop resolution, with default options.
If you're happy with the default advanced graphic details, you're all set, the game will always start at this res.
If you change any graphical option however, the Options folder will resurrect and your resolution will be lost. You'll have to delete
My DocumentsMy GamesRed Faction GuerrillaOptions and re-adjust graphic details in-game everytime you play.
Alternatively, you can
hex edit
My DocumentsMy GamesRed Faction GuerrillaOptionsrfg_display_options.rfgs_pc
Offset : value
0x00000001 : display width
0x00000005 : display height
0x00000019 : windowed on/off
Finally for those not too familiar with hex editing and unhappy with the default graphic options, here are
custom options files for 1280x768, 3840x800, 3840x1024 and 5040x1050 with max details and 4x AA :
download RFG_custom_res.zip (1 kb)
4:3
16:10
16:9
3x 16:10