Right-click the file to see properties or creation dates.
Some jurisdictions use similar alphanumeric codes for public filings or case documents. RJ180002.zip
Large files often suggest media; small files suggest text or data. Source: Where did you download or receive it from? Right-click the file to see properties or creation dates
It could be a technical drawing package or CAD data for a specific part number. RJ180002.zip
Companies often use "RJ" prefixes for automated reports or batch job outputs.
If you can share where you found it or any context about the sender, I can help you narrow down what is inside.