Because RAR is a proprietary format, standard Windows or Mac tools (like "Extract All") may not support it natively. You will need a third-party application:
: The official tool is WinRAR . A popular open-source alternative is 7-Zip . DE09N rar
: For Android, use the RAR for Android app; for iOS, use apps like iZip . How to Open RAR Files on Windows, Mac, and Mobile - Avast Because RAR is a proprietary format, standard Windows