The nworld-ddozen2.zip file you have requested: Tools and Utilities / nWorld Editing Tools v1.2 - 6.19mb is not available. Perhaps try browsing all files for the game Deadly Dozen: Pacific Theater and upload any files you want to share or are missing. This is the only information we could locate:
To install just unzip into your game directory (nWorld.exe has to be in the same directory as ddozen2.exe). As was the case with DD1, these tools are very unsupported. These editing tools and documents allow you to create and edit single player missions as well as multiplayer maps for all game modes.