Is this the best program to make new maps for openXcom?
To my knowledge it is the only program available that allows to edit XCom maps.
I get a crash when I try to open Plane (the skyranger map) Can I fix it?
Plane opens fine with me. Did specify the correct paths for the UFO/TERRAIN folder? Have you changed anything else?
If I want to make a craft that uses acenger, lighting and plane tile set can I do that?
Yes
How do I open the INTERC map? (the XcomUtil_Fighter_Transports mod) (I think I can do this once I get pass the plane crash)
Choose Edit - Paths - Map Files
On the Paths Editor expand UFO - Ships, right click on XCom and choose Add Map -> Existing Map (opens window to select the desired map to be added)
After you've added the Map click on its name under UFO - Ships/XCom then go to the Available Images menu on the right of the window. Scroll down until you see the PLANE tileset, click on it to choose it, then click on the button with the <- to assign that tileset to the map. After you're done, choose Save on the top of the wndow.