Mo.7z
This is the official, free, and open-source software for this format.
In technical distributions, "Mo" is often used as a shorthand for Megabytes (MB) in some languages (like French). You may find winpython.7z files described as having a certain "Mo" size (e.g., 701 Mo .7z) in development discussions on platforms like GitHub . This is the official, free, and open-source software
Since .7z is a high-compression archive format, you will need a specialized tool to open or "unzip" it: This is the official