The u_specail_structrus.zip file you have requested: Mods / FoC Mods / Advanced Underworld Structures - 10.9kb is not available. Perhaps try browsing all files for the game Star Wars: Empire At War and upload any files you want to share or are missing. This is the only information we could locate:
The Advanced Underworld Structures mod alters all Zann Consortium building by increasing their garrison force, adding a healing aura around the structure as well as a few other changes.This mod will make the ZC's bases a lot tougher to destroy, as well as enhancing any defenders nearby. A good download to have if you fancy a challenge, or think the ZC are too easy!