This game is supposed to have config files, but they aren't being created on my system for some reason.
Likely they should be located under %USERPROFILE%\Saved Games\Sniper Ghost Warrior Contracts\Profiles\default\, but I only have a ScreenShots folder under %USERPROFILE%\Saved Games\Sniper Ghost Warrior Contracts\. If anyone have the config files there, let me know what version of the game you have (Steam, GOG etc).
I can also see the game trying to access non-existent config files under C:\Program Files (x86)\Steam\SteamApps\common\Sniper Ghost Warrior Contracts\%USER%\Profiles\default\ when saving sensitivity etc, so it seems like a bug.