i have been able to drop guns into the game.
First you use the LOGIN command to login as GUEST. When you're logged in, use the DIR command and you'll notice you have access to the B drive, which has files for IDs, guns, maps, etc. Type in DIR B:\ and you'll see all the directories on the B drive. Browse all the directories there to see what they all contain. Use the DROP command in the TOOLS folder to drop items. Type DROP B1AXXF2 to get some extra weapons. Use the VIEW command to view the map file that tells where the weapons were dropped.
Also, try the cheat code 0034AFFF to unlock all the weapons.. This was included with the Enter the Matrix bonus DVD that you got when you preordered the game at EB.
i'm at the chopper boss in stage 2. In order to get the weapons, i'll have ot do a fair amount of backtracking. Not sure if it's worth it, but i could use some help against this boss.