Before opening, upload the file to a service like VirusTotal to check it against multiple antivirus engines.
If this was an unsolicited email attachment or a random download, it is highly recommended to delete it . How to Open It
A popular, free, open-source alternative that handles RAR files well. 53502 rar
If you have found or been sent a file named from an unknown source, please be cautious.
If you trust the source and need to see what is inside, you will need a file extractor: Before opening, upload the file to a service
Knowing the context (e.g., a game mod, a work document, or a driver update) would help me give you a more specific review. How to Open RAR Files on Windows, Mac, and Mobile - Avast
While the archive itself is not harmful until opened, the contents can contain malware or viruses. If you have found or been sent a
Because this file name appears to be a string of numbers, it is likely one of three things: