cheats for halo for pc?

ok so i have the cd. i did the whole devmode deal. says the cheat cant be executed at this time. i did the devmode thing a million ways. with spaces and all like everyone says. did anyone else have this problem and were you able to fix it. and if so can you help please. the cheats are not used for multiplayer, they cant be used i should say. it only works single player. again i have done the "-console -devmode" with the " and without them and with spaces and without and a whole lot. i put this at the end of "C:\Program Files\Microsoft Games\Halo\halo.exe" -console -devmode

that was the last one i tried again at the end of exe"

i did exe" "-con etc i also did exe"" -con etc as well as exe" " -con and many other ways