By manipulating the maps you can have many different colors of foliage. The bases of the trunks are widened so the trees look more natural where they enter the ground. They are between about 850 and 1450 polys each which helps keep your master file's size down as compared to the count of real trees. They can be successfully reduced even farther with Max's ProOptimizer if desired.
The .max file was made in Max 2009 Design. For backwards compatibility .obj and .fbx versions are provided.