SCP: Secret Laboratory (700330)

Compatibility Report

• Name of the game with compatibility issues: SCP: Secret Laboratory
• Steam AppID of the game: 700330

There was https://github.com/ValveSoftware/Proton/issues/4094 but it was incorrectly closed with "use custom proton builds" result.
This game has worked before anticheat update in 10.0.0, but then in 10.0.3 it was fixed by the game developers again (but requires wine-staging)

System Information

• GPU: GTX 1050 Ti
• Driver/LLVM version: NVIDIA 450.66
• Kernel version: 5.8.11-1-MANJARO
• Link to full system information report as Gist: https://gist.github.com/js6pak/e620fee37f6d0c6acb36fac2612ace6a
• Proton version: 5.0-9 and 5.0-10-rc4 (GE (because of wine-staging) works fine though)
• Proton log: steam-700330.log

I confirm:

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

Symptoms

Anticheat crashes the game right after the start due to missing windows apis.

Related wine issues

https://bugs.winehq.org/show_bug.cgi?id=49192 and probably https://github.com/wine-staging/wine-staging/tree/master/patches/ntdll-FLS_Callbacks (anticheat)
https://www.phoronix.com/scan.php?page=news_item&px=Wine-Staging-5.7-dotNET-CoreRT (il2cpp launcher)

Reproduction

1. Try launcing the game.

Summary is that Proton's wine should cherrypick wine-staging changes

Start with Proton's Wine integration and the attached steam-700330.log, then compare the missing APIs with the linked Wine bug and ntdll-FLS_Callbacks patch directory. Check the listed Proton versions and the wine-staging behavior; done means SCP: Secret Laboratory launches without the anticheat crash.