Notes about the NB 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 NB file type is primarily associated with 'Mathematica' by Wolfram Research, Inc.. Mathematica is a complete environment for all technical computing tasks, whether simple calculations or large-scale computations, complex programming, visualizing or modeling data, or even presenting to collegues or clients.