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@GOG Team,

just for you information, if I use bash
I get Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap" warnings at elementary OS (Ubuntu).

This can be fixed with sudo apt-get install gtk2-engines-pixbuf.

Also Gtk-Message: Failed to load module "pantheon-filechooser-module" are coming up at the console.
But these messages can be ignored.