[Bug 47817] Gameforge Client: Cannot launch TERA

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47817

--- Comment #22 from Paul Gofman <gofmanp at gmail.com> ---
After looking a bit more into it, I found that I missed the true reason for the
problem in Comment #17, sorry.

Application itself does not actually mess with winstations and desktops. The
desktop for which rendering is failing is "__wineservice_winstation\\Default".
That happens because the games themselves are started with by 'gfservice.exe'
service ("Gameforge Client Service"). The service has flags 0x10 in registry,
thus it is not an interactive service. Then, the service creates game client
with CreateProcessAsUserW() providing user token. Which is supported to create
process with default user desktop set instead of the invisible services one.
Creating processes with user tokens are not currently supported in Wine. The
only thing we need for this case though is to set the user desktop for the
newly created process (if the process is created on behalf of user), probably
just like services.exe sets the desktop for service processes without
SERVICE_INTERACTIVE_PROCESS flag.

Current workaround is to change
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\GameforgeClientService\Type
to 110 from 10 (hex DWORD value), without any patches. This marks service as
interactive and it is created with default visible workstation itself, so that
the processes it creates inherit that.

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