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.

Since ".7z" is a compressed archive format, you can "look into" its features and contents using the following methods: Recommended Tools for Exploration

Windows 11 getting native support for 7-Zip, RAR, and GZ archives

: If you are on Windows 11 and don't see these options, you may need to click "Show more options" or enable shell integration in 7-Zip's Tools > Options menu .

: Using 7-Zip's File Manager , you can view file attributes, such as the total size versus the compressed size, and the specific compression method used (likely LZMA2).