There is only one file type that uses the .NWCP extension:
Nisus Clipboard Document
Document used by Nisus Writer Pro, a rich text word processor; temporarily contains text and images that you add via "Copy" or "Cut;" referenced when you select "Paste."
You can create, edit, and delete NWCP files by selecting, and then select "Clipboard" icon. Here, you'll be able to create a new clipboard, edit the contents of a clipboard, delete a clipboard, and activate a specific clipboard.
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Updated: October 7, 2013