DirectX/OpenGL Mumble Overlay Holder

As many people have unfortunately stumbled upon this issue – Mumble‘s Overlay only works with OpenGL and DirectX9 and ONLY with 32bit (x86) executables. Running on anything else (DirectX11 and/or 64bit .exe) causes the overlay to not display over these games.

This can be seen, for example, in World of Warcraft – when run with DirectX 11 and the 64bit binary.
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