Since operating systems like Windows and macOS do not always have built-in support for .7z files, you will need a third-party tool:
It is an open-source format that can handle almost any compression, encryption, or conversion method. How to Open Kau03.7z Kau03.7z
Supports AES-256 encryption for both the data and the filenames (header encryption), making it impossible to see what's inside without a password if it was set. Since operating systems like Windows and macOS do