There is only one file type that uses the .NSR extension:
Nessus Security Report File
Text report file generated by Nessus, a security application used for conducting network vulnerability scans; saves summary information for a security scan and contains less verbose information than an .NBE report file; used for network security audits.
The NSR format is now deprecated. The .NESSUS format has replaced both the NBE and NSR formats.
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Updated: May 17, 2012