[Bug 32699] Add StartupWMClass to .desktop files.

https://bugs.winehq.org/show_bug.cgi?id=32699

--- Comment #16 from [e-mail] ---
(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/9f55292085392579568ff81b8adb926b...

I am not sure what to search from there.

StartupWMClass 
WM_CLASS

Gave no results.