Thanks Raymk,but yes, I am refreshing the Addon scenery entry in the scenery library.Jon,I am getting some success now.There are two airfield files in the source computer which have ade and ad3 suffixes.one is small,say 80Kb.The other is large,say 900Kb.If I copy the small one to the target ADE open airport page,it appears.If I copy the larger file,they both appear on the page.I then compile and save.I am ensuring that I get both on the page.I then have to copy the ADEbgl file from the source computer to FSX,Addon scenery,scenery on the target.I then go to the scenery library and refresh and the airfield appears in FSX.So I think I am up and running now.I have a problem with one airfield in that when I open it in ADE,the map has a two inch square superimposed on it.It has a delete square in a red box in the top RH corner,the word exclude,preceded by a - and followed by a+ and OK .Nothing I do will remove it,and the only way I can shut down the computer is with the mains switch.I have deleted the airfield from the target computer,checked that this effect is not on the source computer,recopied to the target,and the square reappears.