Issues

• Proposal: Remove MainWindow.xaml from the WinUI project templates

  needs-triage
  microsoft/WindowsAppSDK#6891 · Filter by author YexuanXiao opened on Oct 23, 2026
  1

• Spec: Light/dark color mode detection and change notification

  needs-triage
  microsoft/WindowsAppSDK#6890 · Filter by author riverar opened on Oct 22, 2026

• [App Notifications] Unpackaged app retains custom attribution icon after Register() removes IconUri

  area-Notificationsneeds-area-owner-attention
  microsoft/WindowsAppSDK#6882 · Filter by author Geevo opened on Oct 20, 2026
  2

• Native HLS playback fails with MF_E_UNSUPPORTED_FORMAT when switching from H.264 to HEVC

  area-Externalneeds-author-feedback
  microsoft/WindowsAppSDK#6880 · Filter by author LvanProosdij opened on Oct 20, 2026
  3

• Windows ML auto initialization in unpackaged application

  needs-author-feedbackneeds-triage
  microsoft/WindowsAppSDK#6877 · Filter by author PetrMinar opened on Oct 19, 2026
  1

• [MRM.dll] Off-by-one path calculation in MrmGetFilePathFromName breaks default ResourceManager() in unpackaged apps with 0x8007007A (STRSAFE_E_INSUFFICIENT_BUFFER)

  area-MRTCorebugneeds-triage
  Bug

  microsoft/WindowsAppSDK#6883 · Filter by author doc-shashank opened on Oct 18, 2026
  1

• Windows AI structured JSON completes successfully without reporting progress, including long responses

  area-WCRStatus: Reviewed
  microsoft/WindowsAppSDK#6872 · Filter by author mattleibow opened on Oct 16, 2026
  1

• Windows AI structured JSON generation intermittently returns no progress or completion

  area-WCRStatus: Reviewed
  microsoft/WindowsAppSDK#6871 · Filter by author mattleibow opened on Oct 16, 2026
  1

• TabView templates throw ArgumentException on minimize/restore (negative TitleBar.RightInset assigned to MinWidth)

  area-WinAppSDK:TemplatesStatus: In PR
  microsoft/WindowsAppSDK#6862 · Filter by author Jaylyn-Barbee opened on Oct 13, 2026
  1

• AppInstance.GetInstances() hangs forever after PID reuse: non-current AppInstance ctor leaks ownership of <AppId>_<pid>_Mutex

  area-Lifecycleneeds-area-owner-attention
  microsoft/WindowsAppSDK#6860 · Filter by author ShinoyukiMiyako opened on Oct 13, 2026

• MddBootstrap.h is missing include of <cstdlib> - causes compile error on clang 23

  area-WinAppSDKDeploymentneeds-area-owner-attention
  microsoft/WindowsAppSDK#6853 · Filter by author dlech opened on Oct 10, 2026

• CreateChannelAsync fails with 0x8007139f (ERROR_INVALID_STATE) — Pending PFN to Entra AppId Mapping for Sideloaded MSIX

  area-Notificationsneeds-area-owner-attention
  microsoft/WindowsAppSDK#6842 · Filter by author nixonchew-section opened on Oct 6, 2026
  2

• [App Notifications] Unpackaged official sample: Register/Show succeed and Setting is Enabled, but notification never appears in Shell

  area-Notificationsneeds-area-owner-attention
  microsoft/WindowsAppSDK#6821 · Filter by author moz65535 opened on Sep 29, 2026
  1

• Explicit ResourceContext Language is ignored when PrimaryLanguageOverride is set

  area-MRTCoreneeds-area-owner-attention
  microsoft/WindowsAppSDK#6801 · Filter by author MrtSafin opened on Sep 25, 2026

• MoAppHang during updates of windowless widget hosts

  area-Widgetsarea-WinUIneeds-area-owner-attention
  microsoft/WindowsAppSDK#6797 · Filter by author tipa opened on Sep 24, 2026
  2

• Store upload fails with "Failed to merge PRI file ... 80073B2F" for x86+x64 bundle: Microsoft.Windows.Workloads resources only present in x64 package

  needs-triageStatus: Reviewed
  microsoft/WindowsAppSDK#6790 · Filter by author JosHuybrighs opened on Sep 23, 2026
  1

• Native C++ StaticLibrary is misclassified by Windows App SDK self-contained targets, leaking runtimes-framework into consuming packaged apps

  area-SelfContainedneeds-area-owner-attention
  microsoft/WindowsAppSDK#6780 · Filter by author hoshiizumiya opened on Sep 21, 2026

• windows.diagnosticServiceModule still causes ACCESS_DENIED for WerFault.exe

  area-PackageManagementbug
  Bug

  microsoft/WindowsAppSDK#6777 · Filter by author BernhardMarconato opened on Sep 19, 2026
  3

• AppNotificationManager.Register() still throws 0x8007007E (missing Microsoft.WindowsAppRuntime.Insights.Resource.dll) in self-contained unpackaged apps on 2.5.1; #6071 closed by #6725 but not fixed

  area-Notificationsarea-SelfContainedStatus: Pending release
  microsoft/WindowsAppSDK#6774 · Filter by author GenerAhl opened on Sep 18, 2026
  

• Proposal: Add IReserveableVector to WinRT

  area-UndockedRegFreeWinRTfeature proposal
  microsoft/WindowsAppSDK#6768 · Filter by author YexuanXiao opened on Sep 17, 2026

• NU1603 reported when installing WinUI 2.3.9 (2.5.1) Subpackage only

  area-Metapackageneeds-area-owner-attention
  microsoft/WindowsAppSDK#6766 · Filter by author Sella-GH opened on Sep 17, 2026
  2

• Crash on building a notification

  area-Notificationsneeds-area-owner-attention
  microsoft/WindowsAppSDK#6746 · Filter by author dmitmaloukas opened on Sep 11, 2026

• [Bug] SystemMediaTransportControls.GetForCurrentView throws “Invalid window handle” in WinUI 3

  area-Externalneeds-area-owner-attention
  microsoft/WindowsAppSDK#6740 · Filter by author Lorymi opened on Sep 5, 2026
  2

• Outdated roadmap documentation

  documentationneeds-area-owner-attention
  microsoft/WindowsAppSDK#6736 · Filter by author daverayment opened on Sep 2, 2026

• Fail-fast 0xC000027B on machines with accumulated WindowsAppRuntime 1.8 revisions: activation fails with "Package not found" for the framework package the process is running from

  area-Activationneeds-author-feedback
  microsoft/WindowsAppSDK#6724 · Filter by author cregecambrin opened on Aug 27, 2026
  6