DeathSprint 66: Wine OpenXR assertion dialog appears on startup

Issue transferred from https://github.com/ValveSoftware/Proton/issues/10311.
@actionschnitzel posted on 2026-10-25T13:41:03:

Compatibility Report

• Name of the game with compatibility issues: DeathSprint 66
• Steam AppID of the game: 1273560

steam-1273560.log

System Information

• GPU: AMD AMD Steam Machine (radeonsi, navi33, ACO, DRM 3.65, 7.2.7-valve2-2-neptune-72-g31504582a073)
• Video driver version: RADV NAVI33
• Kernel version: 7.2.7-valve2-2-nepune-72-g31504582a073
• Link to full system information report Gist:
• Proton version: ALL

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

Symptoms

When launching DeathSprint 66 on Linux via Steam, a Wine C++ Runtime Library assertion dialog appears:

• Program: C:\windows\\system32\undll32.exe
• File: ../src-wine/dlls/wineopenxr/openxr_loader.c
• Line: 651
• Expression: !_status && "CreateInstance"

The game does not proceed normally until the assertion dialog is dismissed by clicking OK. After closing the dialog, the game continues starting and appears to run.

This issue started occurring on October 25, 2026. The game previously launched without this dialog.

The Proton log shows that DeathSprint66.exe and ProximaGameAntiCheatShell.dll are loaded. It also contains COM-related errors shortly before the process continues.

The issue appears to be related to Wine/Proton's OpenXR initialization, but the exact cause is currently unknown.

Reproduction

1. Install and launch DeathSprint 66 through Steam on Linux using Proton.
2. Wait for the Wine C++ Runtime Library assertion dialog to appear.
3. Observe the assertion referencing wineopenxr/openxr_loader.c, line 651.
4. Click OK to dismiss the dialog.
5. Observe that the game continues starting.

The issue has so far been observed consistently during startup.

Additional information

The following launch option was used to generate a Proton log:

PROTON_LOG=1 %command%

Relevant log excerpt:

Loaded ... DeathSprint66.exe ... native
Loaded ... ProximaGameAntiCheatShell.dll ... native
err:ole:com_get_class_object class {6962a8a2-bf55-4246-ad5d-9d26e0c1e1ce} not registered
err:ole:com_get_class_object class {71663b86-cc70-44a6-bb3a-40b95b74ebdf} not registered
pid 4843 != 4842, skipping destruction (fork without exec?)

Full Proton log: steam-1273560.log (to be attached).

System information and the exact Proton version will be added once collected.