Before you attempt to open or extract the file, use these tools to verify it is safe:
A free, open-source alternative that supports RAR files, available at 7-zip.org . sisbigbro (8).rar
Use reputable software like Malwarebytes or Windows Defender to scan the file locally. Before you attempt to open or extract the
Upload the file to VirusTotal to check it against dozens of different antivirus engines simultaneously. open-source alternative that supports RAR files
If you are 100% certain the file is legitimate, you will need a RAR extractor to see its contents: