This is a checklist to help you find relevant error messages in your Proton log.

Search the Proton log for the following prefixes to find errors/warnings:

• fixme:
• err:
• warn:
• error:

Tracked athttps://github.com/ValveSoftware/Proton/issues/2613

• warn:module:load_builtin_dll cannot open .so lib for builtin L"Steam2.dll":

Currently Steam for Linux does not generate the custom executable for games using Valve's CEG DRM, this is tracked athttps://github.com/ValveSoftware/Proton/issues/753

You can look forcegpublickey onhttps://steamdb.info/app/<appid>/config/ to check if a game is using this.

Problems with missing cinematics/cutscenes are most likely due to Media Foundation, Quartz or WMVcore issues.These are tracked athttps://github.com/ValveSoftware/Proton/issues/1464

• mfplat.dll
• mfplay.dll
• mfreadwrite.dll
• mfstartup.dll

• quartz.dll
• fixme:quartz:MPEGSplitter_QueryInterface
• err:quartz:GetClassMediaFile Media class not found

• WMVcore.dll
• fixme:wmvcore:WMReader_Open
• fixme:wmvcore:WMCreateSyncReader

• Microsoft.Xna.Framework.Video.dll

Xaudio2 issues are labeled "XAudio2" by the moderator.The Proton log typically includes one of the following:

• XAudio2_7.dll
• xaudio2_8.dll

.net issues are labeled appropriately by the moderator.These include:

• .NET-UE3 (Unreal Engine 3.)
• .NET-winforms (System.Windows.forms toolkit)
• .NET-WPF (PresentationFramework)
• .NET-XNA (Uses XNA framework, implies Xaudio2 and possibly WMP)