Games using Easy Anti-Cheat crash at launch when prefix is created with WOW64 enabled

protonopen

ValveSoftware/Proton#9600 · opened 2026-03-22 by wantija · updated 2026-04-21 · 2 comments · github

Wwantija 2026-03-22 github

Compatibility Report

Name of the game with compatibility issues: Any game using Easy Anti-Cheat
Steam AppID of the game: 823130, Various (using Totally Accurate Battlegrounds in this example).

System Information

GPU: RX 7900 XT
Video driver version: Mesa 26.1-git
Kernel version: 6.19.7
Link to full system information report as Gist:
Proton version: Experimental

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.

steam-823130.log

Symptoms

When a game that uses Easy Anti-Cheat has it's prefix created for the fitst time with WOW64 enabled, trying to play the game will show the EAC splash screen then crash.

Reproduction

Add PROTON_USE_WOW64=1 %command% to a game that uses Easy Anti-Cheat's launch options
Make sure the game doesn't already have a prefix created, backup/delete it if so
Launch the game
It crashes

MMadOne 2026-04-04 github

Someone found a possilble fix : https://github.com/GloriousEggroll/proton-ge-custom/issues/505

Wwantija 2026-04-21 github

This is still an issue with the Proton 11 beta, proton log for Totally Accurate Battlegrounds attached.