A member at Celestial Heavens and I were trying to use tools from another LithTech game, No One Lives Forever, to edit MMIX's resources. I was able to open some of the "worlds" (areas/regions/what have you), but couldn't repack them into the game. I also managed to dig up an ancient program named WinREZ, capable of opening the data archives. Some surprisingly interesting stuff was inside (developer texts, unused names for every shop in the game, stuff from the early version of Legends of Might and Magic, etc).
Since then, I've been wondering whether those are among the tools TELP used to create their game-fixing patch, but never asked for various reasons... until now, I guess!