If you must check its contents, upload it to VirusTotal or use a file checker tool to scan for malicious patterns.
Older versions of WinRAR have known vulnerabilities (like CVE-2023-38831) that allow attackers to execute malicious code just by the user opening the archive. 2020Plague23.rar
If you have encountered this file on your system or a suspicious website, do attempt to open it. RAR files can be used as delivery vehicles for malware. If you must check its contents, upload it