Launch box is a a container that allow to "launch" a game...
A bat file with the link of the game...
Assassins Creed Odyssey - https://stadia.google.com/player/8b7e7f7036e5483eaa8745d46248536crcp1
Destiny 2 - https://stadia.google.com/player/20e792017ab34ad89b70dc17a5c72d68rcp1
Farming Simulator 19 - https://stadia.google.com/player/ebf235012b054269af70eee901bc85cfrcp1
Final Fantasy XV - https://stadia.google.com/player/a447622dbe084c3e9ace4f913a939afarcp1
Football Manager 2020 - https://stadia.google.com/player/8a3cc52ad2334b1e91ded77bc43644e0rcp1
Grid - https://stadia.google.com/player/ca805d3d37404654a91d2ea62fad7bd4rcp1
Gylt - https://stadia.google.com/player/18a3cc2bb111419c8ac873086d04dfaarcp1
the bat file should be like this for ex.
start "" https://stadia.google.com/player/18a3cc2bb111419c8ac873086d04dfaarcp1