Do you have the other of this archive (part01 through part10) to attempt an extraction?
However, the naming convention provides some clues as to what this might be: Possible File Contents
: The use of generic, repetitive characters (RRR, DDD) and multi-part archives is a common tactic for distributing ransomware or malware while avoiding automated security scans. Important Safety Considerations
21 CFR Part 11 -- Electronic Records; Electronic Signatures - eCFR PART 11—ELECTRONIC RECORDS; ELECTRONIC SIGNATURES. eCFR (.gov) What Is Part 11 Compliance?