: Before opening, upload the file to VirusTotal to check it against dozens of antivirus engines.
: Revisit the website or email where you found the link. Look for a "Readme" file or a description section on the download page that explains the versioning (e.g., what "EADO" stands for). Dis3 _EADO.zip
: It may be a compressed archive for a niche software project, a university course (where "Dis" might stand for "Distributed Systems"), or a private database. : Before opening, upload the file to VirusTotal