Yeah, the track packager can be found in many places around the internet for free download, so yeah.
Type in nolimits track packager on google, download it and once it's downloaded, you should be able to put these "pieces of paper"
into that, which then converts them into a rideable track.
The reason for this is that these are tracks that usually have some form of 3D modelling or environment etc... and it is easier for everyone if these are all packed into one file along with the trackfile itself. So instead of manually putting all the 3D models into your models folder on NoLimits, by simply putting it through the track packager, it does it all automatically!
[:D]