If you have verified the file is safe, you will need a third-party tool to open it, as Windows does not always support .rar files natively. ¿Qué es un archivo RAR y cómo lo abro? - Avast

Once you open the archive to view the contents (without running them), look for files ending in .exe , .scr , or .bat . These are programs that can install malware if executed.

Is there a safe way to open an rar file using a windows program?