Drag SCX files into your
c:\program files\microsoft games\Age of Empires 2\Scenarios folder
You can then play them as scenarios by selecting "standard game" and for map, click "scenario.." You can also edit them with the map editor.
Make sure you have the expansion pack, though!
non-expansion pack scenarios are 'SCN'
For campaigns, same thing, except into the c:\program files\microsoft games\Age of Empires 2\Campaigns folder. Everythings the same, except to play them, go to "custom campaign" non-expansion pack campaigns have the extention CPN and x-pack campaigns have the extention CPX.
Same applies for AI (suffix .ai and .per) except you put them into the c:\program files\microsoft games\Age of Empires 2\AI folder.
I think theres something else, but I dunno...
¯\/\\evo'_____________________________________¯¯//¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯"i get more IM's from AOL System Message than from everyone else"-Anonymous