This indicates it is the second part of a split volume archive. To extract the contents, you must have all parts (e.g., .001 , .002 , .003 ) in the same folder and open the first file ( .001 ) using a utility like 7-Zip or WinRAR.
Be extremely cautious if you received this file via email or downloaded it from an unfamiliar source. Federal investigators have recently warned of a surge in using deceptive file names and "update tools" to spread malware. SS-Sav-004_v.7z.002
The SSA OIG explicitly states they do not send unsolicited emails with attachments for "security updates." This indicates it is the second part of