The official 7-Zip utility is the most reliable option. Once installed, simply right-click the file and select "Extract Here".
Everything You Need to Know About 1stKG.7z: A Guide to Safe Handling 1stKG.7z
Once you open the archive (but before running anything), look for suspicious file extensions inside, such as .exe , .bat , or .scr . If you were expecting images or documents but see these, proceed with extreme caution. Why Use 7z for Your Own Files? The official 7-Zip utility is the most reliable option