Upload the file to a service like VirusTotal. They use over 70 different antivirus engines to check if the file is known to be malicious.

Be wary of messages claiming you must download this file to "fix an error" or "view an invoice."

If you weren't expecting a file from the sender, treat it as a threat.

Right-click the file and select "Scan with Microsoft Defender" (or your preferred antivirus like Avast or Bitdefender). 4. How to Open ZIP Files (If Verified Safe)