It might actually try to use one of the FL12 features which would fail if your GPU doesn't support it. It's impossible to say more without logs.

@K0bin
is there config file like in dxvk to set maxfeaturelevel.
GPU supports 12_0 according to GPU-Z. But in windows 7 Max support is dx 11.
I thought vkd3d-proton converts d3d12 call to vulkan ones. In Linux Env variable to fool game work.
In Windows how to pass varialble VKD3D_FEATURE_LEVEL=12_0 to d3d12.dll?
In main page of this repo mentions windows as test enviroment.
How to log in windows?

Windows is not supported and if your GPU doesn't support a particular feature level, it also won't support the equivalent Vulkan features that VKD3D-Proton requires.

@K0bin In Windows 10 how to pass env Variables for logging?

You can just set the env variables like you normally would through Windows. Or through cmd.