24.World Builder will read a .big file if its name starts with "Expand" before its actual name. For Zero Hour it must be placed in the Data\Ini\ folder, otherwise it can be placed in the main game directory. World Builder will only read one .big file though.
The original download manager that SDI used got corrupted ages ago. After some years, we've built this temporary downloads section to allow visitors to download the material this site used to have. Unfortunately, we have no clue on what some of these items really do. For this reason, we are not adding any descriptions at this moment. If you have any idea of what each of these items do, please contact me, so we can update it with more information.