Follow this link for the original instructions: http://www.101cheats.net/cheats/16968/PC%20-%20Windows/KKnd%202%20:%20crossfire.html
1. Go to your CrossFire folder in Windows Explorer.
2. Right click on the kknd2.exe file and select create shortcut.
3. Right click on the newly created shortcut and select properties.
4. In the target field, add "-badnews" to the end of the line. It should look something like this: "Kknd2.exe -badnews".
5. Click OK
6. Double click the shortcut to begin CrossFire.
7. While in game, press Ctrl-Tab to activate cheat codes.
Here are some common cheat codes:
CTRL-M = Extra money.
CTRL-C = Win level.
CTRL-F = Lose level.
CTRL-W = Turn on waypoint information.
CTRL-E = Turn off waypoint information.
CTRL-T = Turn off the fog of war Command line parameters.
More hints are available at the above link.
Good luck and thanks for using FixYa.