Use a text editor to edit the "config.cfg" file in the "players" directory in the
game folder. Add the following line to the end of the file:

seta thereisacow "1337"

You can now further modify the file by binding any of the following cheat codes to
an unused key. For example, adding the following line will bind the God mode cheat
to the "O" key:
bind o "god"

Save the "config.cfg" file, then Right Click it, select "Properties", and set it to
"Read Only". Begin game play, then start a new level by either using the "Mission
Selection" option or starting a new game. Then, press the corresponding key during
game play to activate the corresponding cheat function. There is no confirmation
that a cheat code has been activated.