Never bothered to look into what it contained, but using the ROM outside steam is a very interesting proposal, thanks!

I think I have a single Steam game from within which I can then run those games. How would I backup the delisted games?

Thanks to the API Proton, the Steam Deck supports dozens of games

Dozens, really!?

https://www.youtube.com/watch?v=JGIGA8taN-M

Didn’t watch it through. Please come back with summary if you do :)

I remember using http://www.abandonia.com/