Application (& docs) Icons ?

I wanted to check drag and drop in a WIndows compilation of a project and noticed (after shutting down the PC) that the application does not had an Icon.

Then I drove to my morning PC Headquarters and realized that … it is normal: I created a Post-Build Script to move the Icons into the build… to avoid enlarging the project size / the project load time…

According to the release notes, I set the application Icon name to App.icns troubled my mind and I do not think at the Windows icons.

Question:

How do I do a Post-Build Script for WIndows to copy the needed icons to the Windows “Not-Stand Alone” application ?
(no pun intended).