Created by the nebulous "Chamberlain Bio-Research Labs" (CBRL), File 019 was intended to optimize cargo transport for off-world colonies. However, the RAR file was lost during a server crash and has since become an urban legend among data-miners. It is known as the "Pandora’s Box" because while you can put things in, getting them out unchanged is the challenge.
Modern extraction tools like 7-Zip allow you to double-click the archive to view the file list inside without actually running or extracting the files. Check the file extensions of the internal items: CBRL-019.rar