Thanks for the reply, and the welcoming!
Here's the link to the civ. It hasn't been updated for about six years. I guess that might cause the problem...
http://forums.civfanatics.com/showthread.php?t=146469
Basically there is a folder called "kingdom_of_sweden_v10f", that is the folder that came out of the zip file, and that i put in the "Mods" folder.
Inside there is an ini file named "kingdom_of_sweden_v10f" and another folder called "Kingdom of Sweden".
Inside of that is another ini file named "Kingdom of Sweden", an "Assets" folder, and a "Readme" file.
The "Assets" folder has "Art", "Sounds" and "XML" folders, containing all that good stuff.
If that didn't make any sense (it's kind of hard to know if you explain well enough when English isn't your first language) I have made this chart (or something).
Mods (folder)
\/
kingdom_of_sweden_v10f (folder)
\/
Kingdom of Sweden (folder) + kingdom_of_sweden_v10f (ini)
\/
Assets (folder) + Kingdom of Sweden (ini) + Readme (txt)
\/
Art (folder) + Sounds (folder) +XML (folder)
\/ \/ \/
Stuff Stuff Stuff
Thanks for the help!