Check out this tutorial if you are interested, it is a good quick visual run through of how to get a game running on your steam deck with dos box.
https://m.youtube.com/watch?v=jiIDEfznP6g
The main tutorial is only 6 minutes, the rest is the person showing how to do it several different ways and talking through the process. Something I also appreciate is how they immediately transition to talking about Decky Loader which is a utility that allows the steam deck to run plugin utilities in Gaming Mode/inside the steam overlay in gaming and specifically one of its plugins, SteamGridDB.
https://github.com/SteamGridDB/decky-steamgriddb
https://github.com/SteamDeckHomebrew/decky-loader
See when you add your random DOS game to steam it just looks sad and blank next to all your official steam games. That doesn’t inspire you to play the game! SteamGridDB comes to the rescue though by making it take a matter of seconds to browse the steam community for artwork banners and icons themed for that game and painlessly spruce up how your favorite non-steam games look when browsing through your library in Gaming Mode (basically “console mode”).
You can search for the game name or just rename the launcher file you added to steam as the original game (i.e. in steam rename the game My Favorite Old Game not MyFavOldGame_launcher_V2) and the automatic search in SteamGridDB should pull up any artwork made by the community for custom game banners and such.
It seems like a small thing, but it isn’t.
(You can also use your own custom artwork with SteamGridDB which you have to for most obscure games but you would be surprised what other people have uploaded for niche games it definitely surprises me).
I like evil/spacemacs because I can get my vim fix virtually, because emacs from a software engineering perspective is beautiful!