There is only one file type that uses the .NWS extension:
Windows Live Mail Newsgroup File

- Developer Microsoft
-
Popularity
- Category Data Files
- Format N/A
File created by Windows Live Mail (and Outlook Express), an email and news client for Windows; stores newsgroup posts and is usually saved alongside .EML files; used for storing local cached copies of posts for newsgroup subscriptions.
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Updated: July 14, 2011