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Problems launching the Crusader Kings III and Hearts of Iron IV launcher

Status: Open.

#9461 In ValveSoftware/Proton;

· salitv1999 opened on Feb 3, 2026

Beltomatic Failed to start: "Invalid argument: '../drive_c'"

Status: Open.

#9460 In ValveSoftware/Proton;

· CalebMorris opened on Feb 3, 2026

Brickadia (2199420)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

Status: Open.

#9459 In ValveSoftware/Proton;

· Cheddar3 opened on Feb 2, 2026

version.dll: Prefer native, builtin

Feature RequestNew feature or requestNew feature or request

Status: Open.

#9456 In ValveSoftware/Proton;

· Radless0 opened on Feb 1, 2026

PEAK (3527290)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

Mesa driversPossibly involves an issue with a Mesa video driverPossibly involves an issue with a Mesa video driver

Status: Open.

#9454 In ValveSoftware/Proton;

· pollux78 opened on Feb 1, 2026

PROTON_USE_WINED3D should also disable DXVKD3D8

Feature RequestNew feature or requestNew feature or request

Status: Open.

#9453 In ValveSoftware/Proton;

· Jake1702 opened on Feb 1, 2026

Thrillville: Off the Rails (6080)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

Status: Open.

#9450 In ValveSoftware/Proton;

· SecularSteve opened on Jan 31, 2026

Pocket Waifu: Desktop Pet (2989820)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

Status: Open.

#9444 In ValveSoftware/Proton;

· afritsch opened on Jan 28, 2026

Split Fiction (2001120)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

XAudio2Uses the XAudio2 subsystemUses the XAudio2 subsystem

Status: Open.

#9442 In ValveSoftware/Proton;

· major-mayer opened on Jan 28, 2026

Please re-enable nvapi (dxvk-nvapi) on aarch64 builds for NVIDIA DGX Spark features

Feature RequestNew feature or requestNew feature or request

Status: Open.

#9439 In ValveSoftware/Proton;

· scaronni opened on Jan 27, 2026

Ravenswatch (2071280)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

Status: Open.

#9438 In ValveSoftware/Proton;

· bgish3 opened on Jan 26, 2026

Battle Shapers (1421290)

Game compatibility - UnofficialGames not expected to work without issuesGames not expected to work without issues

RegressionConfirmed working on an older version of ProtonConfirmed working on an older version of Proton

Status: Open.

#9435 In ValveSoftware/Proton;

· wrongusernameyetagain opened on Jan 25, 2026