You cannot open a .rar file directly with standard Windows or macOS software. You will need a file archiver tool:
A popular app for expanding RAR files on Mac computers. El Rival.rar
The official tool for creating and extracting RAR files. You cannot open a
Right-click the El Rival.rar file and select "Extract Here" or "Extract to [Folder Name]" using the software installed AVG. Security Considerations El Rival.rar
To compress large files for faster transfers and to organize multiple files into one container. How to Open "El Rival.rar"