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Metal Gear Solid 5 Proton Experimental

There was a new Proton Experimental update a few days ago with some fixes for a multitude of games. Metal Gear Solid 5 should be playable again, a memory leak has been fixed for HITMAN World of Assassination, and video playback should be working again in Legend of Mana. We also have a fix for Arc Raiders not being playable after the most recent update, and keyboard controls are working again in XCOM 2.

The new update should automatically download if you already have the experimental layer. If not, just search for Proton Experimental in the Steam store on your Steam Deck and download.

Proton Experimental 6/19/26 Update Changelog:

  • Fixed Tom Clancy’s The Division 2 not starting when Steam Properties language is set to certain values.
  • Fixed Metal Gear Solid V: The Phantom Pain not being playable after a recent game update.
  • Fixed a memory leak in HITMAN World of Assassination.
  • Fixed cinematic playback in Resident Evil 0 HD Remaster.
  • Fixed intro video playback in Legend of Mana.
  • Fixed Proton Experimental regression that broke keyboard controls in XCOM 2.
  • Fixed Proton Experimental regression that made controller buttons incorrectly mapped in Like a Dragon: Infinite Wealth.
  • Fixed Arc Raiders not being playable for some users after a recent game update.
  • Fixed Proton 11 regressions:
    • Improved rendering of the Imperiums: Greek Wars launcher.

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Noah Kupetsky
A lover of gaming since 4, Noah has grown up with a love and passion for the industry. From there, he started to travel a lot and develop a joy for handheld and PC gaming. When the Steam Deck released, it just all clicked.
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