Because of the heavy demand for DX12 modding, developers have created specific forks to handle the newer API:
Are you trying to or create your own custom asset? 3dmigoto dx12
A: The same limitations apply. 3DMigoto is a DX11 tool and does not support Vulkan games. Because of the heavy demand for DX12 modding,
It can intercept a game's request for a specific texture and replace it with a custom asset (e.g., a .dds or .png file) from a ShaderFixes or Textures folder. 3dmigoto dx12