There is only one file type that uses the .NLTRACK extension:
NoLimits Roller Coaster Track File
Stores the track data for a roller coaster created with NoLimits, a roller coaster simulation program; includes 3D track models, track and coaster materials, and physics data, such as friction, acceleration, and deceleration information.
|Mad Data NoLimits Rollercoaster Simulation 2||Free Trial|
Updated: January 10, 2016