To see what is inside , you will need extraction software. Common options include: WinRAR: The official utility designed for this format.
The file appears to be a specific compressed archive, though it is not a widely known public file with a singular, documented purpose. Generally, a .rar file is a "Roshal Archive" used to bundle and compress multiple files into a single, smaller package.
Only open the file if you trust the person or website that provided it.
It could be a numbered asset for a game mod, a specific driver update, or a database backup. How to Access It