: These files are natively created and managed by the WinRAR archiver , but can also be opened by free tools like 7-Zip or WinZip . Key Features of RAR Volumes nbdn/build_tools/winrar/Rar.txt at master - GitHub
: To successfully extract the data, you must have all parts of the archive (e.g., Vol1 through Vol10) in the same folder.
"VolJ10.rar" typically refers to the (part) of a split multi-part RAR archive. Multi-volume archives are used to break down very large files into smaller, manageable chunks for easier sharing, storage, or emailing. How Multi-Part Archives Work