Can you tell me how to change the default sky

Go to ...\BF2_ModTools\assets\worlds and now click to the world file with the sky you want to have. For example Tatooine - Mos Eisley.
...\BF2_ModTools\assets\worlds\TAT\world2 copy now the tat2.sky data in your world folder. Here the Path:
...\BF2_ModTools\data_ABC\worlds\ABC\world1
Then delete ABC.sky and rename tat2.sky to ABC.sky.
After that delete all "sky" TGA's in your world1 folder, then go to:
...\BF2_ModTools\assets\worlds\TAT\world2
again and copy all the TGA's used by the tatooine sky file, to your world folder, where you put tat2.sky. So:
...\BF2_ModTools\data_???\worlds\???\world1

Munge.

It dosnt work

See the Getting Started documentation, I'm 99.99% sure it's in there.

Ok

EDIT:It works.10x all