There is only one file type that uses the .NWCAB extension:
Neat Cabinet File
An NWCAB file is a cabinet file created by Neat 5, a digital document organizer. It contains a cabinet, which includes information about all the scanned documents, contacts, and receipts in a cabinet. NWCAB files are automatically created when you start using Neat.
You most likely will only see the NWCAB file if you search the Neat Data folder in your Documents folder. Typically, there are two other files in the Neat Data folder with the NWCAB file: A Neatworks file and an image file, both with the ".nwdb" extension.
If you come across an error message indicating that you cannot open a Neat database, it most likely means that a file in your database is corrupt, locked by another program, or missing. You should check that all three files are in the Neat Data folder. If one of the three files is missing then it causes the error message.
NOTE: If you want to share your NWCAB file you can export it as an .NDX file.
My Cabinet.nwcab - Default name given to NWCAB files when they are created by Neat.
Updated: March 22, 2017