Based on common cybersecurity threat intelligence and file-naming conventions, is highly likely to be a malicious file [1].
If you've already opened or extracted the file, please tell me: RTool.rar
disconnect your computer from the internet immediately to prevent data exfiltration, and run a scan in safe mode. RTool.rar
What is your computer showing (e.g., slowing down, weird popups, missing files)? Did you run a scan with an antivirus program? RTool.rar