Use a hex editor to ensure it's actually a RAR file and not a renamed JPEG or EXE.

If you are looking for a "paper" because you are stuck on the file, here is the standard workflow for these types of challenges:

A placeholder name used in training modules (like those on TryHackMe or HackTheBox) to practice safe extraction.

Where did you ? (e.g., a specific website, Discord, or course?)

Often used as a password-protected archive where the key is hidden in metadata or through steganography.