Can you clarify or what its approximate size is? This could help narrow down whether it belongs to a specific dataset or historical archive.

Forensically Analyzing ZIP & Compressed Files | by Josh Lemon

: Do not open the archive unless you are certain of its origin. 7z archives can contain malicious executables .

: Check the location where you obtained the file. If it was part of a specific project, consult that project's documentation or its User Manual .