This indicates that the file is the third segment of a larger split archive. To extract the data, you generally need all parts (Part1, Part2, etc.) in the same folder.
Are you getting a (like a CRC error) during extraction? Do you have the other parts of the archive? hrj01223192part3rar verified
Avoid "online rar openers" which may harvest your data. Stick to established software: The native tool for .rar files. This indicates that the file is the third