Look at where you found the link. If it came from a YouTube description, a random Discord server, or an unverified "free games" site, it is almost certainly unsafe.
Opening or extracting a .rar file can sometimes trigger scripts or reveal executable files ( .exe ) that infect your system the moment you run them. Black-Mesa-Definitive-Edition.rar
If you didn't purchase the game through official channels, the safest move is to delete the file and run a full system scan with Malwarebytes or Windows Defender. Look at where you found the link
Did you , or are you seeing it flagged by your antivirus software ? If you didn't purchase the game through official
Scammers often use the names of popular games or "Definitive Edition" tags to trick users into downloading trojans, miners, or info-stealers. Safety Steps to Take
Before doing anything, upload the file to VirusTotal to see if multiple antivirus engines flag it as malicious.