Since this looks like part of a multi-part set, you will typically need (part1, part2, etc.) in the same folder to extract the actual content.
If you have the file, tools like VirusTotal can "review" it for security by scanning it against dozens of antivirus engines. 948E8GT95CB689T8A824.part4.rar
To help you figure out what's inside or if it's safe, you might want to look at: Since this looks like part of a multi-part