ToME: the Tales of Maj'Eyal

I'm trying to edit the base tome module, and looking at the file size it looks like I should just be able to rename/unzip tome-1.5.0.team, make my changes, turn the folder into an uncompressed zip, change back to .team. The game doesn't recognize this when I'm starting a new game though, what am I doing wrong?

personally, i use winrar and scite to edit things myself. works with absolutely no problem.
no need for unzipping/renaming.

Don't you have to unzip to edit? If not, how, and if so how do you compress them when you're done?

They're 0 compression anyways and IIRC winrar let's you see the file structure before you unzip.