Sky setting?

[NT]

Help! I tried to change the sky setting in C4 mission by putting a Sunset 3 in the Enviroment File box. But nothing changed! No sun showed up! I tried other settings but the sky stayed the same, no change!
Could someone tell me what I miss?
Thanks.

[Reaper]

The sky settings dont work in the c4 med.
If you wanna make a night map, or change the time of day you use fog. Theres a fog color picker here to down load. Start at 2000 for distance and work in. The lower the number the more night like the map will be. And you can see the sun in a night map if your at the rite angle.