[Bug 9159] shell32/explorer: Add support for Progman DDE interface

https://bugs.winehq.org/show_bug.cgi?id=9159

--- Comment #40 from Zebediah Figura  ---
(In reply to Ken Sharp from comment #39)
> - There's nothing created on the desktop. It's been so long since I used
>
> these that I do not know if it is normal.

The interface doesn't create any links on the desktop in XP, which is what I
mainly used for testing. The same may not be true for earlier systems which
actually used progman.exe, though. I'm not really sure how we should interact
with that component.
> - Program Manager is opened multiple times. Again, it's been so long...

This isn't normal behaviour, but it's also a preëxisting bug. The problem is
basically that explorer.exe doesn't respect the /n or /e flags (and also, I
think, that ShellExecute() doesn't differentiate between the "open" and
"explore" verbs.) I think while looking into this I found more architectural
problems than I wanted to deal with at the moment—for example, on Windows,
Explorer windows all seem to run in the same process (which may or may not be a
separate process from the desktop process, depending on whether a certain
option is set).