There is only one file type that uses the .NLOGO extension:
NetLogo Model File
Model created by NetLogo, a program used for modeling and simulating natural and social phenomena; saves the initial parameters of the simulation as well as source code and interactive buttons that drive the simulation.
NetLogo is often used in research and academic environments. It can be used for observing complex behaviors of many independently interacting agents, referred to as emergent behavior. For example, bugs swarming or dispersing are examples of emergent phenomena that can be observed in a model written with NetLogo.
Updated: December 6, 2012