this post was submitted on 21 Jan 2025
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It's a custom solution called pressure-vessel, which seems to be based on flatpak. You can read about it here. This is used to create a reproducible linux environment and has nothing to do with the windows translation layer. They run wine (proton) inside the container as you would expect.
There is a recent effort to port this solution outside of steam in the form of umu. As far as I know it's in a working state but I don't know if it's at feature parity with steam, especially on the game-specific fixes front. The end goal is to be a universal launcher that can be used from all frontends, so that all windows games run reliably and identically regardless of which GUI you use to manage your games.
EDIT: welp, I just now noticed this info has already been posted by another user 🤷