Editor skinning thread

Does anyone of you know how to swap out the editor icons? I am trying to use the old icons from before the 2019 editor “upgrade”. I put them in the “Editor Default Resources\Icons” folder as described here . However this is not working at all.

I saw some of your skins had changed a couple of editor icons, how do they achieve that?
I have the import format set to “Editor GUI and Legacy GUI”

Can anyone help me out?
I am working on a theme that restores the editor to how it used to look, and this is pretty much the final step.

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