Hello Dietz, you can get some missions here.....
http://airwarfare.com/index.php?name=Downloads&c=2This site is set up for skins too, but there hasn't been any uploaded in a while???
There are actually 2 folders for missions in the data folder. The single player missions go to the \Missions folder and can be grouped in sub-folders. Online missions go in the
\Multiplayer\Cooperative folder and are placed there loose,(no sub folders). The loose files for missions you have require the,.mission ,.msnbin, and at least 1 language file to go with it, .eng ,.spa,.fre ,.ger, or .rus.
The Multiplayer missions need the files above plus a, .list file to work.
From what I understand, older missions sometimes have problems working after newer patches, and the quick fix for this is to delete the .msnbin file for that mission, then open up the mission in the Mission Editor and save it again. This will rewrite the .msnbin file to the specs of the newest patch.
I hope this helps.
Ewar