Only open the file if you trust the person or website you downloaded it from. Be especially wary of archives found on lookalike domains (e.g., sites that mimic official software pages).
If you are planning to create your own archives like "1stKG.7z," there are several benefits: How to Use 7-Zip to Compress Files and Extract Files 1stKG.7z
The official 7-Zip utility is the most reliable option. Once installed, simply right-click the file and select "Extract Here". Only open the file if you trust the
To access the files inside "1stKG.7z," you will need a file archiver. While Windows and macOS have built-in support for ZIP files, they often require third-party software for 7z files. 1stKG.7z