While the prospect of Steam games running on your phone is a tantalising one (and an Arm-based Steam Deck, a bizarre thought), what's probably more likely here is testing for Wind

The Steam Deck might be the most popular Linux PC ever, though you’d be forgiven if you haven’t realized that its SteamOS software is technically Linux. The Proton compatibility layer is the Steam Deck’s special sauce,

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Valve is working on an ARM64 implementation to bring x86-based Steam titles to mobile devices — including its rumored standalone VR headset

Valve may be developing an ARM64 version of Proton for Linux gaming. Hundreds of games, like Left 4 Dead, have been tested for compatibility using a new 64-bit layer. The potential for ARM64-based portable consoles opens exciting new possibilities.