There is only one file type that uses the .NRX extension:
Neat Receipt Folder File
Receipt folder file created by NeatWorks, a digital document organizing application; contains an exported copy of a Neat receipt folder of scanned receipts that can be shared between Neat users; replaced by Neat 5's .NDX extension.
To import a NRX file into Neat 5, select, click "Browse," navigate to your NRX file, and click .
NOTE: The NRX file is similar to .NRT and .NRF files, which are used by older versions of Neat.
Updated: January 23, 2016