Did you expect this file from a known person? If the email was unsolicited or "urgent" (e.g., "Payment Receipt MIX2.7z"), delete it immediately .
If you received an email with the subject "MIX2.7z" or found this file unexpectedly, it is likely a . MIX2.7z
Upload the file (or the file's hash) to VirusTotal . It will scan the file against 70+ different antivirus engines. Did you expect this file from a known person
If you do open the archive (only in a safe, isolated environment), look for files inside ending in .exe , .vbs , .scr , or .iso . These are almost always malicious when hidden inside an archive. Summary Recommendation "Payment Receipt MIX2.7z")