I have the problem that the icons aren't readable with all wallpapers. For example: with black wallpapers the icons still being displayed with black text.

The problem has nothing to do with the system option icon shadow. The

The negative color should be set as "desktop colour", in order to contrast it.

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Suggestions for the implementation: use the function SetSysColors of Windows API. It should update the colors immediately:

https://stackoverflow.com/questions/19840413/how-to-change-the-background-color-registry-and-update-desktop-immediatly