: Developed by Igor Pavlov , it uses the LZMA algorithm to achieve sizes significantly smaller than standard ZIP files.

Are you running into an while trying to open or modify the file?

: To modify game logic, such as adding a new tournament mode or changing scoring rules.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. Does 7z compress better than zip? - Microsoft Community Hub