Bannerlord launcher (.NET 4.8) crashes on AtlasOS - missing AppDomainManager / KERNELBASE.dll (0xe0434352)

[vincentfrigo65-a11y]

Hello guys,

I’m running AtlasOS (latest version on win11) and trying to launch Mount & Blade II: Bannerlord. All the desktop runtimes and redistribuables needed for the game to work properly are installed.
The launcher (TaleWorlds.MountAndBlade.Launcher.exe) immediately crashes with this exception:

Exception code: 0xe0434352
Faulting module: KERNELBASE.dll
Exception: System.IO.FileNotFoundException / System.TypeLoadException
at System.AppDomain.CreateAppDomainManager()
Framework version: v4.0.30319

It suspect AtlasOS removed or disabled parts of .NET Framework 4.x (for example, the NGEN or fusion services).

Could you please confirm:

• Which components or features need to be re-enabled in Atlas Toolbox to fully restore .NET Framework 4.x support?
• Is there a recommended way to re-register the CLR / fusion assemblies without reinstalling Windows?

My goal is to make Bannerlord’s launcher start normally.

Thanks in advance !