Since .rar is a compressed archive format, you cannot open it directly like a regular folder. You need extraction software:
The standard tool for managing RAR files, available for download at rarlab.com . Download 13hola rar
If this is for a specific game or project, I can help you find the correct, official download link. RAR - Apps on Google Play Download 13hola rar
Select or "Extract to 13hola/" to view the contents. Download 13hola rar