This is a simple application that adds the path passed as a command line argument to Steam. This adds an entry to the right click menu in Dolphin of Windows or Linux executables to add them to Steam on the Steam Deck. 
How To Install
- Launch into the desktop mode
- Download the add-to-steam.sh script. Save the file when prompted
- Right click add-to-steam.sh in Dolphin and select Properties
- Navigate to the Permissions tab
- Check ‘Is executable’, then click ‘OK’
- Right click add-to-steam.sh in Dolphin and select ‘Run in Konsole’
Source: https://github.com/suchmememanyskill/steam-deck-addons/tree/main/Dolphin-rightclick-addtosteam
