Found new problem...files like fighter.bsp in 0maps and maps are 2 different files...how should I name them in my mod folder...do I need to create 0maps archive + maps folder? I will try it that way. I will create 0maps archive with my fighter files and separate maps folder. I have some feeling there is something more to this, maybe some script???!
In order to add a new aircraft to a map theme, you would have to create a .map file for this craft, using the mapeditor called UFORadiant. This file needs to be compiled to a .bsp with the mapcompiler (ufo2map). Then it needs a tile descriptor in the map´s .ump file. It needs an entry in the map definition (maps.ufo ), so the game knows this craft is available for the map. Unfortunately, due to technical problems beyond my understanding, the mapeditor is currently broken for win.
There is no need to create archives in any way.
On the other hand, a UFO would work without adding any maps, as some maps don´t care about the UFO type.
If you want some more detailed info, please ask.