Nb extension is related to Mathematica Notebook files. You can try to open these files with Mathematica software.
The datas that obtained from the process, calculations and formulas which created by Mathematica software use nb file extension. Nb files can be opened by any text software such as Word or Note Pad. However, if you need to use these files files properly, you should install Mathematica software.
To get detailed information, please take a look: wolfram.com
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