On my Windows I have the Whatsapp App installed from Windows Store.
Now I would like to change its Icon, without luck so far.
I tried following this answer and it does create a taskbar Icon that opens Whatsapp having a different icon, but Whatsapp opens in a new Taskbar icon with its original and does not stack.
The aim is to have a secondary Whatsapp (beta) installed for another account using a different color.