Cool_wallpapers.rar -

High . Filenames like this often appear in malicious advertisements or "cracked" software sites [2].

If you already opened the file, run a full system scan with a reputable antivirus like Microsoft Defender or Malwarebytes . cool_wallpapers.rar

If you still have the file, upload it to VirusTotal to see if multiple antivirus engines flag it as malicious. cool_wallpapers.rar