How do I install a scenario/map/modpack?
First things first: download the content you want (it is probably a zipped file). Upon opening the zip, you’ll most likely see a folder and/or a scenario file. A map will just be a scenario file, as there are no custom units/content. A scenario and mod will have both, since there is new graphics and such along with a scenario file to load the mod/scenario from. Now, you have to extract these folders and files to your Civilization III scenario folder, where all custom material goes. This folder is located in C:/Program Files/Infogrames Interactive/Civilization 3/Scenarios/ (if you have PTW or C3C, go to that folder inside your Civ3 one before Scenarios). Once you have dragged the folder and editor file to this scenarios folder, you can run Civilization III and load your scenario, map, or mod.