It sounds like something very limited in capabilities that was designed only to run steam games on their handheld gaming computer. Another person suggested Chimera OS, and that seems similarly limited. I did a quick search for "how to choose a linux OS to replace windows" and found this article https://www.pcmag.com/how-to/how-to-make-the-switch-from-windows-to-linux that suggests Mint. I guess that plus Wine https://itsfoss.com/use-windows-applications-linux/ should work.