If you received this file unexpectedly, perform these steps before opening:
Automated systems may generate numeric filenames based on a date or ID.
It could be one piece of a much larger split file. 22840.rar
Right-click the file and run it through your antivirus (e.g., Windows Defender, Malwarebytes).
To access the contents, you need a utility like WinRAR, 7-Zip , or PeaZip . If you received this file unexpectedly, perform these
Did this come from a trusted person? Is it a "part" of a larger download (e.g., 22840.part1.rar )?
Are there other (e.g., 22841.rar) in the same folder? What is RAR file extension - PeaZip If you received this file unexpectedly
Upload the file to VirusTotal to check it against 70+ security engines simultaneously.