HaloMods "Classic" Read-only Archive

ok i got HMT 3.5 and started by using the tutorial that came with it. but when i went to do the first step of putting the .map file in the HMT it asked me to decompress the file and when i hit the yes button this message came up, "Not yet supported... Why is it in the menu then??? Good question...

I have HCE on my modded xbox and i can use it fine but my question is can i put new modded maps on and i dont mean small scale mods i mean like this http://www.halomods.com/maps/snakes_living_room/2.jpg I've tried all kinds of things but still can't get the files to work. any help will be greately a...