NBP - Mathematica Player Notebook File
This is a file created by Mathematica which is a software package designed for scientific and mathematical computations. It may contain text, graphics, calculations, user interface components and sound clips. It can be used to store analysis results as a part of an interactive document. These files are similar to the NB file type but include a 'signature' and may be played with the free Mathematica Player application. NBP and NB files are both saved with the 7-bit ASCII text format.