Unlimited Ammo and Grenades
Locate the following file:
C:\Program Files (x86)\Steam\steamapps\common\Deadfall Adventures\EvilGame\Config open DefaultWeapon.ini
Open this file with Notepad. Look for the following section:
Change DefaultInfiniteWeapon=false to DefaultInfiniteWeapon=true and save the file. You should now have unlimited ammo and for all weapons and unlimited grenades.
(supplied by: thegrube)