I've made a port of awesome Windows application to make fast translations of text (QTranslate). Unfortunately that application uses system tray. After start of that application I see that awfully window. Do you have any idea how to move that small icon into Wingpanel?
I guess this answers it even if it is a "Won't fix":
Wine uses an ancient system tray that is not supported. https://bugs.launchpad.net/elementaryos/+bug/1221158