I hae the costtom supports dlaoded but I need to know what file to ut it in and how to activate them(use them).

Check out shauns tutorial on custom scenery. That should tell you everything you need.
http://www.ataricommunity.com/forums/sho...p?t=521101

anso, check out this:
http://forums.rct3x.net/Complete-List-of...-2374.html

Hope this helps.

It does