It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

Hello, is it normal that GoG version of WC2 does not support Windowed mode even though I set the game to Windowed mode in the DirectX Configuration thingie?

Using Win10.
Well I have no problem playing in Windowed Mode with Win10.