._nws is Windows Live Mail Newsgroup Copy File
Key Features: ._NWS File Extension
What is an ._NWS file?
Newsgroup file created by Windows Live Mail (WLM); automatically generated when a user drags a newsgroup post or postings to the desktop; contains the same data as an .NWS file, except uses the "._nws" extension; can be renamed with the ".nws" extension and then opened in WLM.
- Microsoft Windows Live Mail