how to open files in rct3

how do i open the files in rct3. i know how but where do i put the files i read the help thing but its not working please somebody help me! and does anyone know any other sites to download rct3 coasters from?

Page 81 of the RCT3 help manual lists the destination folders where you should place your files. Don't forget to unzip them before attempting to load anything from the game.