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This prevents a potential "Trojan" from communicating with its home server.

Use a tool like 7-Zip or WinRAR to "Open Archive" instead of "Extract." This allows you to see the file extensions inside (e.g., .exe , .scr , or .bat ) without running them.

Upload the file or the URL to VirusTotal , which scans items against over 70 different antivirus engines and URL/domain blacklisting services.