macOS does not open .7z files natively, so you'll need a third-party app like Keka.
This is the free, open-source tool the format was designed for. You can download it from 7-zip.org .
If you found this file on a website you don't recognize or via a suspicious link, .
.7z files from unknown sources, as they can contain malware or viruses.
Always scan the file with antivirus software (like Windows Defender or Malwarebytes) before extracting it.