: Most modern antivirus software can scan the contents of a ZIP file as long as it is not password-protected. If the archive is encrypted (requires a password to open), your antivirus may not be able to see the files inside until they are extracted. How to Safely Inspect the Content Zip and unzip files - Microsoft Support
Based on the "RJ" product identification system, here is what a file with that name typically contains:
likely refers to a compressed archive of a specific digital product, most commonly associated with the Japanese digital marketplace DLsite . The "RJ" prefix followed by six digits is a standard product ID format used on that platform to identify adult-oriented content, including ASMR, voice dramas, or independent games. Potential Content of the Archive