Notes about the NAS file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The NAS file type is primarily associated with 'Nasal' by Andy Ross.
Nasal is a language written for use in a personal project.
It is a small-but-complete embeddable scripting languages. It is still young and incomplete in a few places, but is under active development and has been integrated as the extension language for the FlightGear simulator.