If you have verified the source is trustworthy, follow these steps to preview and extract the contents: 7Z: Zip 7Zip Rar File Manager - Apps on Google Play
RAR files from unknown sources can contain malware. Attackers often use entice-sounding filenames to trick users into running malicious executables hidden inside. Always scan such files with a tool like VirusTotal before opening. How to Handle the File Safely Download File Preview_MG-S07.rar