On windows, does the driver installs vulkan-1.dll? or is the responsibility of the application?

Doing Vulkan development with a small team. One of the dev didn’t have vulkan-1.dll installed.

He installed 376.19 which didn’t install vulkan-1.dll. He had to run VulkanRT-Installer.exe from the driver package.

Is that the expected behavior? Was the driver installer supposed to install the Vulkan loader or should the application makes sure it’s installed (with VulkanRT-Installer.exe).