A file size of exactly for a compressed .rar archive is a common characteristic of "droppers." These are small applications designed to bypass initial security scans and then download a much larger, more malicious payload once executed on your system. The Risks of Downloading Unverified Archives

Unauthorized modifications to game files or anti-cheat engines. Why the 1.35 MB File Size is a Red Flag

Upload the .rar file to VirusTotal to see if multiple antivirus engines flag it.

Altering low-level Windows kernel functions.

Do not open the archive. Extraction can sometimes trigger malicious scripts.

Before downloading, understand that files with these specific naming conventions often appear on unofficial forums or file-sharing sites as "cracks" or "unlockers," but they frequently contain security risks. What is GRINX64v2.rar?