"RAR" is used as an abbreviation for Regionaal Archief Rivierenland in the Netherlands. Filenames like "422 RAR scan" are commonly found in online genealogy databases referencing specific digitized baptismal or church registers.
Do not open the file. Instead, upload it to VirusTotal to scan for malware across multiple antivirus engines. _422_.rar
It may be a truncated segment of a larger release, such as the EBook Converter Bundle v3.19.212.422 , which ends in those digits. "RAR" is used as an abbreviation for Regionaal