To do the Halo map mods you run Halo, load the map you want to edit & return to evox.
Then you can do 1 of 2 things:
1: FTP into either x/y/z whichever one was used (you'll know which one cause there will be files like cachemap00.map in there, check out the Game Hacks forum to find more info about which file is which map). Then you can either use one of the programs out there like "Halo MapItem Editor" to edit the map or hexedit the file yourself and then FTP back to the same place you got it from and run Halo again. Once you load the map the changes you made are there.
-OR-
2: You could do it the easy way and get "Halo Cache Editor" which is a program that runs on the xbox iteslf and there's no need to FTP the files. It's really quite user friendly too.
The reason why this works is because the cache does not get overwritten evertime the game loads. That's the whole point of having the cache... to cut down on load time.
Anyway, try it out, they can be quite fun
~Scuzzell <