Programs like WinZip or Unzip One can also be used.
Right-click the file, select your archiving program (e.g., 7-Zip), and choose "Extract Here". Troubleshooting
If the file is encrypted, you will need the password provided by the creator, which can be entered using 7-Zip or WinZip.
As with any compressed file from the internet, you should only open LS ISLAND.7z if it comes from a trusted source to avoid potential malicious software. How to Open/Extract the File