Using Nvidia OpenCL-drivers with an ICD-loader on Windows

I have configured Installable Client Drivers (ICDs) on an Ubuntu-distribution with Intel OpenCL runtime drivers, which was fairly straightforward. These drivers come as * .so-files which can be loaded by specifying their path in an *.icd-file under /etc/OpenCL/vendors/

How would I proceed to specify Nvidia OpenCL-drivers on Windows, and where are these drivers located?

I use MINGW64 with and OpenCL-ICD-Loader installed via MSYS2

Where is the corresponding directory to add the *.icd -files?