Copy a mission file from another map, then modify it to upload your map with the .dif in it.
I read this many times and still don't get what you mean...
Are you saying that I change the name of the .mis file to something like EmptyRoom.mis then put the textures and .dif file into a compressed folder with the mission file?
Edit: I got it, but there's a problem when I try to play BL on the map.
Could not execute file "Add-Ons/Map_Empty_Room/emptyroom.mis"
Do I seriously have to put a code in there?