Current questions and answers regarding the map editor.

I have four maps created in the editor. And I have four cooperative maps made from those four maps. The cooperative maps differ only in that the teams are configured and the map name is changed in Map Properties. Why does the game display either the cooperative maps or the regular maps, but not both at the same time? For example, there is map 01 and a cooperative map 01C, but the game only sees one or the other, but not both at once. How can I fix this?