Once you're in the game, you should be able to use the following cheat codes (hit the "~" key to bring down the console, then type them in):
Some people have experienced problems activating the cheats as listed above. Here is an alternate to try if they are not working for you.
1. Add " +set sv_cheats 1" to the target line of the shortcut, as shown above.
2. Add a blank "user.cfg" file to the folder labeled "Main", in the game folder to "Return to Castle Wolfenstein".
3. Type one line in that "user.cfg" file: set sv_cheats 1
4. Enter codes as shown above.
Special Note #2
Some people have not been able to use the cheats unless they first load a saved game. New players can start, save, then load the save and the cheats should work.
Use these with the /give cheat listed above.
fg42 paratroop rifle
Used with the /spdevmap command.