Comment 33 for bug 1103833

(In reply to Eike Hein from comment #15)
> I'm really really hoping for someone more qualified to pop up (since I don't
> know the wine codebase), but failing that I can try to take a stab at it yes.

Does this link help?

https://source.winehq.org/git/wine.git/blob/9f55292085392579568ff81b8adb926b32a8d99a:/programs/winemenubuilder/winemenubuilder.c#l1599

I am not sure what to search from there.

StartupWMClass
WM_CLASS

Gave no results.