Required if you are using the (highly recommended) Vulkan renderer.
Almost 90% of RPCS3 DLL errors are solved by installing the redistributables. Action: Go to the official Microsoft support page. rpcs3 all dll files top
If you see a "Vulkan-1.dll" error, do not download the DLL file manually. This file is part of your GPU driver. Required if you are using the (highly recommended)