[SDK BUG] Duplicate InterfaceId for Game Bar private types in the NuGet package

[lirrik]

Describe the bug
Starting from version 7.3.2511061 of the Xbox Game Bar NuGet package, there is a new type added: Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost10. However, according to the readme.txt file in the package, it has the same InterfaceId as Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost9: BC40A15A-6961-4D04-A9CD-34680A0F5ACD.

When copied over to the package.appxmanifest file of the project as instructed, this starts causing a crash in Visual Studio 2026 XAML designer, where the duplicated InterfaceId is referenced.

To Reproduce
Copy over required XML from readme.txt of the package to the package.appxmanifest file of your project. Visual Studio XAML designer will not work anymore.

Expected behavior
Unique InterfaceId for each type and no crashes for VS XAML designer.

Screenshots

Desktop (please complete the following information):

• OS version: Windows 11 25H2 build 26200.8328
• Visual Studio 2026 18.5.2
• Game Bar version: 7.326.4151.0
• SDK version: Microsoft.Gaming.XboxGameBar 7.3.2511061

Additional context
N/A

[vidager]

Thank you for reporting. We'll investigate this and get it resolved. Thank you!

[vidager]

ok I confirmed the interface does have a new guid. The issue is just in the readme.txt that we ask you to copy when updating the nuget. Here's the correct guid.

[uuid(3284F0E0-F506-481F-88D3-9DDF6C02B56B)]
interface IXboxGameBarWidgetHost10
{

Sorry about that. We'll fix the guid in our next NuGet push.

[antoniohou]

Hi Ben McGregor (@vidager) I update the nuget 7.3.2607010 and the IXboxGameBarWidgetHost10 fix to 3284F0E0-F506-481F-88D3-9DDF6C02B56B, but the following IXboxGameBarWidgetNotificationHost seams to accidentally change to 3284F0E0-F506-481F-88D3-9DDF6C02B56B from 7.3.2511061. So now it still have error when I build. Before 7.3.2511061 the IXboxGameBarWidgetNotificationHost is 6F68D392-E4A9-46F7-A024-5275BC2FE7BA, it seam this should be the right GUID for this.

[vidager]

Sorry about that. I see the issue that happened oct last year when host10 interface was added. The dev copied over the notification guid instead of host10. Now that I corrected host10 it's duplicated with the notification guid.

Sorry about the mess. thankfully it's something you can copy yourself in the manifest. Honestly, we need to get rid of this manual copy and just solve it automatically in the build props/targets file. I'll see about doing that when I have time. For now this should be the proper list.

  <Extensions>
    <!-- Enlighten COM on where to find Metadata Based Marshaling (MBM) data for the Game Bar private types
       <Path> is a required element (by VS) and has to point to a binary in the package, but it's not used when the class id is
       00000355-0000-0000-C000-000000000046 (MBM). Due to that we just put the Microsoft.Gaming.XboxGameBar.winmd here. -->
    <Extension Category="windows.activatableClass.proxyStub">
      <ProxyStub ClassId="00000355-0000-0000-C000-000000000046">
        <Path>Microsoft.Gaming.XboxGameBar.winmd</Path>
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarAppTargetHost" InterfaceId="38CDC43C-0A0E-4B3B-BBD3-A581AE220D53" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarAppTargetInfo" InterfaceId="D7689E93-5587-47D1-A42E-78D16B2FA807" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarAppTargetInfo2" InterfaceId="68930F3C-2FDF-44D3-A052-A417EA54CD98" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetActivityHost" InterfaceId="2B113C9B-E370-49B2-A20B-83E0F5737577" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarHotkeyManagerHost" InterfaceId="F6225A53-B34C-4833-9511-AA377B43316F" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetAuthHost" InterfaceId="DC263529-B12F-469E-BB35-B94069F5B15A" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetControlHost" InterfaceId="C309CAC7-8435-4082-8F37-784523747047" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetForegroundWorkerHost" InterfaceId="DDB52B57-FA83-420C-AFDE-6FA556E18B83" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetForegroundWorkerPrivate" InterfaceId="42BACDFC-BB28-4E71-99B4-24C034C7B7E0" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarNavigationKeyCombo" InterfaceId="5EEA3DBF-09BB-42A5-B491-CF561E33C172" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetActivatedEventArgsPrivate" InterfaceId="782535A7-9407-4572-BFCB-316B4086F102" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost" InterfaceId="5D12BC93-212B-4B9F-9091-76B73BF56525" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost2" InterfaceId="28717C8B-D8E8-47A8-AF47-A1D5263BAE9B" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost3" InterfaceId="3F5A3F12-C1E4-4942-B80D-3117BC948E29" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost4" InterfaceId="FA696D9E-2501-4B01-B26F-4BB85344740F" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost5" InterfaceId="A6C878CC-2B08-4B94-B1C3-222C6A913F3C" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost6" InterfaceId="CE6F0D73-C44F-4BBD-9652-A0FC52C37A34" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost7" InterfaceId="B7D246E1-F61B-43A2-9120-25D9AC31BB17" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost8" InterfaceId="0E4A1F7C-3D5B-4E8C-8F2A-6D9A0B2E5F7C"/>
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost9" InterfaceId="BC40A15A-6961-4D04-A9CD-34680A0F5ACD"/>
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetHost10" InterfaceId="3284F0E0-F506-481F-88D3-9DDF6C02B56B"/>
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetNotificationHost" InterfaceId="6F68D392-E4A9-46F7-A024-5275BC2FE7BA" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetNotificationPrivate" InterfaceId="C94C8DC8-C8B5-4560-AF6E-A588B558213A" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetNotificationPrivate2" InterfaceId="A7E3B2D1-4F8C-4A6E-9D2B-1C5E8F3A7B90" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetPrivate" InterfaceId="22ABA97F-FB0F-4439-9BDD-2C67B2D5AA8F" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetPrivate2" InterfaceId="B2F7DB8C-7540-48DA-9B46-4E60CE0D9DEB" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetPrivate3" InterfaceId="4FB89FB6-7CB8-489D-8408-2269E6C733A1" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetPrivate4" InterfaceId="5638D65A-3733-48CC-90E5-984688D62786" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetPrivate5" InterfaceId="73B9289B-812C-4FA4-979B-180770DC92B3" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetPrivate6" InterfaceId="687766A8-6A24-4691-ADDC-88AA57582B47" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetRecordingHost" InterfaceId="E85FD1C6-2867-44C3-B00A-AEEBBA76E438" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetRecordingHost2" InterfaceId="B33C864A-F353-43AA-B518-AF5DB4FB6B4B" />
        <Interface Name="Microsoft.Gaming.XboxGameBar.Private.IXboxGameBarWidgetRecordingResultSummaryPrivate" InterfaceId="7D701751-288D-4C6C-A466-97FBA0D21111" />
      </ProxyStub>
    </Extension>
  </Extensions>