Omerta: City of Gangsters

protonopen appid 208520Game compatibility - Unofficial.NET

ValveSoftware/Proton#4422 · opened 2020-11-28 by 1338 · updated 2025-12-02 · 2 comments · github · game page · search this game

11338 2020-11-28 github

Compatibility Report

Name of the game with compatibility issues: Omerta: City of Gangsters
Steam AppID of the game: 208520

System Information

GPU: Nvidia GTX1060M
Driver/LLVM version: nvidia 455.38-2
Kernel version: 5.9.3-arch1-1
Link to full system information report as Gist: https://gist.github.com/1338/67391effae40b50cce261b004be48ddf
Proton version: 5.13-2

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 the game with an internet connection it won't start the game correctly
steam-208520.log

Reproduction

Start game with internet connection, for comparison sake a proton log of running the game without internet connection
steam-208520.log

Kkisak-valve maintainer 2020-11-28 github

Hello @1338, possible line of interest from the log: [000000E4:] EXCEPTION handling: System.NotImplementedException: Managed.TextFormatting.FullTextLine.GetRunMetrics for MS.Internal.Text.TextSpanModifier

Mmadewokherd 2025-12-02 github

Tried again with some of the recent WPF work. I didn't get the NotImplementedException. It failed on my first try with an ArgumentException, but I couldn't get a stack trace because it started after that.

Nothing extracted yet.