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Why are there so many different Proton versions? Proton 8, Proton 9, Experimental, GE-Proton
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this post was submitted on 12 Jan 2025
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It's basically Valve's testing center for an eventual stable release. Not everything makes it in to stable, but a lot does. Valve also works very closely with CrossOver (who develops WINE, which Proton is based on).
EDIT: CrossOver is the product that Codeweavers produce. That is essentially the proprietary upstream of WINE. That code trickles down to the open source WINE and Proton projects.