Oh, hmm... This is really odd. I tried using both ..\Scenarios\MoveCapital (MoveCapital being the name of the folder that's a copy of the Ancient Treasures folder) and ..Conquests\Ancient Treasures (which is the location of the original folder already contained in the game), and both would just return the same error message, FILE NOT FOUND "#".Did you put the '..'. If you note in the MP versions of the conquests how it's done. You could also just copy that path, and then rename whatever scenario folder it is.
Then I tried using ..Conquests\Scenarios\MoveCapital and ..Conquests\Conquests\Ancient Treasures. With both of these, the game would just display the following error message: Missing entry in "text\PediaIcons.txt": ICON_BLDG_Burial_Mound. Now, ICON_BLDG_Burial_Mound is definitely included in PediaIcons in both of those folders, so I don't understand why it's complaining. It's too bad that the error message is not showing what exact search way it's using, so I can't determine if it's really looking in the folder I had intended.