There is only one file type that uses the .NWELICENSE extension:
License referenced by Nisus Writer Pro, a rich text word processing program; contains the license verified by Nisus Writer Pro in order to use the application beyond the trial period; includes the owner name, type of use, and expiration date of the license.
To view your license(s), select. In the dialog box you'll be able to view your license(s), buy a license, or enter your license.
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Updated: September 7, 2013