How do you get catwalks and steekwork on roller coaster tycoon 3

steelworks link:
http://www.trackworx.com/Steelworx.html

you will find there is catwalks in the ubove file
you put it in
C drive.
Program files.
Atari
Rollercoastertycoon3
Style.
themed.

You may find it won't go into that area so what
you have to do is put it in another file in style and then
cut and paste it into themed then open up rollercoastertycoon3
and it should be in..
Theming.
Walls and roofs.

Hope it helped :D :D