Hi smoke14,
You need to use the track package to open and use those files. You can download it from this page:
http://www.coastercrazy.com/17603/Nolim ... k-PackagerOnce you have downloaded it, proceed to install it. Once done, on your desktop you should see a green roller coaster track icon. Open that program and from there you open the nlpack files and install them. All they really are are zip files with the folders. The program will extract the contents to the right folders and when its done, it asks you if you'd like to ride the track now. Click ye sof course and you're all set!