If you did not specifically request this file or if it came from an untrusted website, it is safest to delete it immediately. Tools to Open RAR Files
Since Windows and macOS do not natively support the RAR format, you will need a dedicated extractor: How to open and extract rar files on Windows 10 pc? Download Riswqwsdeft5rtggr rar
RAR files cannot harm your computer while they are compressed, but they can contain executable viruses (.exe) that trigger once extracted. If you did not specifically request this file