DXVK that is an important piece of Steam Play (Proton) for the Direct3D API implemented over the Vulkan API began as D9VK. Over time DXVK expanded then to supporting Direct3D 9 / 10 / 11 and even D3D8 too. Meanwhile VKD3D-Proton delivers Direct3D 12 atop Vulkan. Now there is a fork of the DXVK project working to bring Direct3D 7 support atop Vulkan...