These are files for Unreal and Return to Na Pali maps. These are all single player maps. These maps cannot be played from your game. In order to play these maps you must download them. Then you must put them in the map folder in that game. Then you can play then through the editor. Exp. I download a map from Unreal. I find the Unreal folder in my computer. I open the maps folder and put the single map file in there. Lastly, I have to run the map editor for that game. (Most Unreal games come with an editor, you should be able to find it in Unreal>System) Then I open the map I downloaded and click play map.