Installation instructions seem to not cover KDE
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pip3 install icoextract followed by copying exe-thumbnailer.thumbnailer into /usr/local/share/thumbnailers/ works fine for me on XFCE and Gnome, however on KDE/Dolphin this doesn't seem to do the trick.
Is there a different approach required or am I doing sth. wrong?
You're right, KDE is an exception because they have their own fairly complete thumbnailing stack. On Debian/Ubuntu for example, the kio-extras package installs /usr/lib/x86_64-linux-gnu/qt5/plugins/windowsexethumbnail.so, which provides thumbnails for .exe files in Dolphin. (It also includes other thumbnailers for opendocument, djvu, etc.)
Actually I had to install icoutils in order to see icons in KDE/Dolphin from EXE files, kio-extras alone wasn't sufficient (stock Kubuntu Focal).
Then I had to realise that icoutils needs about 100-200ms before it switches from the default icon to the actual icon. That's why I thought would be a good idea to switch to the much faster icoextract I'm used to from XFCE/GNOME.
I did a bit more research and it appears that KDE only supports C++ / Qt modules for thumbnailers, and not generic scripts like most file managers. So unfortunately, I don't think it's feasible to add support for KDE since it uses a completely different architecture.
OK, thanks for your efforts!