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Not sure if this correct, but it was kinda hard to find, if you have no clue what Proton Ge is

Proton GE is a compatibility layer that allows more games to run on the Steam Deck

Proton is the compatibility layer from Steam (e.g. a wine fork). Meanwhile, ProtonGE is a fork that has a couple of enhancements. GE stands for GloriousEggroll, the author's nickname.

Edit: and they're used in many Linux machines, not only steam deck

it's important to note that both proton and protonge are soft forks, they pull most changes from their upstreams.

here is more info: https://boilingsteam.com/protonge/

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