Change FOV (Field of View)

http://steamcommunity.com/app/55110/discussions/0/613958868376337903/

From the above discussion, here are a few links.

55-75 Degrees: https://community.pcgamingwiki.com/files/file/421-red-faction-armageddon-fov-fix/
Thanks to Psycho for telling me to correct the link.
He also added: "files inside are binary format and cannot be edited to achieve 90°. The header includes "Created using Gibbed's Volition Tools" "
90 Degrees: https://mega.co.nz/#!ispFFT6R!T3KZBHD-5cWkbDY2W9AOiFVowXkBCKAN6ird4Qmnui4
Apparently this mega link is broken. I do not have a replacement. I recommend searching for this link on google and seeing if you can find sources.

Unzip the files using 7zip or something similar, and place both files into your game directory. Likely ProgramFiles(x86)\Steam\steamapps\common\red faction armageddon

Then paste the two files into

\build\pc\cache\

I did it myself, so here are some screenshots.