[Bug 59987] New: RoGetActivationFactory (combase.dll) is a semi-stub: loads native Windows.UI.Xaml.Hosting.dll but never calls DllGetActivationFactory

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59987

            Bug ID: 59987
           Summary: RoGetActivationFactory (combase.dll) is a semi-stub:
                    loads native  Windows.UI.Xaml.Hosting.dll but never
                    calls DllGetActivationFactory
           Product: Wine
           Version: 11.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: comsvcs
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---
      Distribution: ---

When running an application (RedM/CitizenFX client) that calls 
RoGetActivationFactory for the WinRT class 
"Windows.UI.Xaml.Hosting.WindowsXamlManager" 
(CLSID 28258a12-7d82-505b-b210-712b04a58882), Wine's combase.dll 
fails with:

err:combase:RoGetActivationFactory Failed to find library for 
L"Windows.UI.Xaml.Hosting.WindowsXamlManager"

I placed genuine, correct-architecture (x64) copies of 
Windows.UI.Xaml.dll and Windows.UI.Xaml.Hosting.dll (extracted from 
a real Windows 10 install) into system32, and forced a "native" 
DLL override for both. Wine's loader then successfully loads 
Windows.UI.Xaml.Hosting.dll (confirmed via +relay/module trace 
logging, PROCESS_ATTACH completes normally), but immediately calls 
RoOriginateError with 0x80040111 (REGDB_E_CLASSNOTREG) and unloads 
the module WITHOUT ever calling DllGetActivationFactory on it.

This suggests RoGetActivationFactory's failure path runs before 
any attempt to query the loaded native DLL's own 
DllGetActivationFactory export, even when that export is present 
and the file loads correctly.

Wine version tested: 11.0 (stable-25.08 branch, CrossOver 26 
build also tested with same result)
Platform: Steam Deck (SteamOS), x86_64

Expected: RoGetActivationFactory should attempt to call 
DllGetActivationFactory on a successfully-loaded native override 
DLL before giving up.

Actual: Function fails via hardcoded internal lookup and never 
touches the loaded module's exports.

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[Bug 59987] RoGetActivationFactory (combase.dll) is a semi-stub: loads native Windows.UI.Xaml.Hosting.dll but never calls DllGetActivationFactory

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59987

Ken Sharp <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |normal

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