While you can launch games not purchased from Steam in its desktop app, games from the Microsoft Store or PC Game Pass need a little help to work.

How to add Windows games and apps to your Steam library When it comes to applications and games downloaded from the Microsoft Store or Xbox Game Pass titles, things get a little more complicated ...

The Add a Non-Steam game to my Steam Library option can be found either under the Games tab or by clicking the Add a Game button in the bottom-left corner.

From indie hits like Minecraft to fan-made emulators and more, you can actually add just about anything to your Steam library to helpfully consolidate your library of video games.

Microsoft's wide array of Xbox Game Pass titles are accessible for Steam Deck players to enjoy with this workaround using Xbox Cloud Gaming.