[Oberon] How to activate Middle Mouse CLick on Windows 10

[Dieter]

Hi there, I am one of the few fossils still working with

ETH PlugIn Oberon for WindowsTM / Win32 2.5 (18.12.2010)
      on Windows 2008 Version 6.1.7600  Glötzel at GLÖTZEL-PC

I can no longer  use the middle mouse key.
I did have it running properly some time ago, but meanwhile I forgot the
clue.

Thanks,

Dieter

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Dr. Dieter Glötzel
Im Rosengarten 27
64367 Mühltal
Tel.: 06151 / 360 82 72