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If you want to play with your own desired resolution it is very simple to do so.

1, open env_vars.cfg located in Firestarter/Base.
2, find the line saying reg ker_width INT "x" and replace the x with your desired width, for example 1920.
3, find the line saying reg ker_height INT "x" and replace the x with your desired height, for example 1080.
4, save, exit and start the game. Congratulations, you're playing Firestarter the way you want.
(If you look in the Video section in Options, the game says you play in 800x600. This is obviously false.)
5, to be sure it stays this way you can write-protect the file.

To change the FOV, look here.
Thanks Jefequeso! :)
Post edited August 08, 2015 by Ghostbreed
Thanks for this man. For a second I was having trouble with really sluggish mouse movement in this game but I guess it was just my mouse playing up.
No problem friend :)