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Updated Microsoft.WindowsAppSDK from 2.0.1 to 2.6.4.

Release notes

Sourced from Microsoft.WindowsAppSDK's releases.

2.6.4

Windows App SDK 2.6.4 removes the Limited Access Feature requirement for the Language Model APIs, updates ONNX Runtime to 1.27.1, and includes reliability fixes across WinUI 3, app lifecycle, notifications, DispatcherQueue, Content, composition, and Windows AI.

What's new in WinAppSDK 2.6.4:

  • Language Model APIs no longer require a Limited Access Feature unlock. Apps can call the Language Model APIs without first unlocking the Language Model Limited Access Feature. Apps using earlier Windows App SDK versions must continue to follow the LAF requirements for their target Windows versions.
  • Updated ONNX Runtime. The version of ONNX Runtime has been updated to 1.27.1. See ONNX Runtime versions for more info.

Bug fixes:

Bug Fix Runtime Compatibility Change
Fixed an access violation crash that could occur during app shutdown when a text control, such as a TextBox or RichEditBox, was still alive while the XAML core was being torn down. CCoreServices_InputServicesTeardownOrder
Fixed an issue where AppInstance.GetInstances could fail with E_INVALIDARG while enumerating application instances. AppLifecycle_GetInstancesProcessHandleFix
Fixed a crash when calling some AppNotificationManager and AppInstance APIs. AppNotification_AppInstance_FixStackOverflowCrash
Fixed an issue where self-contained apps could fail to load Microsoft.WindowsAppRuntime.Insights.Resource.dll when using the VersionInfo APIs or registering an AppNotification callback (microsoft/WindowsAppSDK#​6071, microsoft/WindowsAppSDK#​6387). VersionInfo_MissingInsightsResourceDll
Fixed an issue where an unhandled exception in a DispatcherQueue callback could produce a crash dump with only the HRESULT, omitting the app's original exception type, message, and stack trace. DispatcherQueue_CaptureCallbackErrorContext
Fixed the same crash dump issue for unhandled exceptions in DispatcherQueueTimer.Tick event handlers. DispatcherQueueTimer_CaptureTickErrorContext
Fixed an issue where a failure while creating a ContentIsland or other Content object immediately terminated the app. The original error is now returned to the calling code instead. ContentIsland_InitializationFailureCleanup
Fixed system backdrop support for lifted content islands and XAML windows when using the System Composition Engine. SwitcherSystemBackdropBrushSupport
Fixed projection of compatible Windows.UI.Composition objects into Microsoft.UI.Composition, preserving object identity, when using the System Composition Engine. SwitcherColdWrappingWUCToMUC
Fixed a crash in ItemsView when the target of StartBringItemIntoView was collapsed or recycled before the scroll completed (microsoft/microsoft-ui-xaml#​11865). ItemsView_InvalidBringIntoViewAnchor
Fixed a crash that could occur when a WebView2 control received focus while still initializing and its parent window was temporarily disabled when initialization finished. WebView2_HandleMoveFocusInvalidArgument
Improved diagnosability for Windows AI model initialization APIs. AIFabric_Tip_APIClassName_ReasonName
Fixed false IntelliSense errors on XAML-generated members, such as InitializeComponent and x:Name fields, in WinUI 3 C# projects edited in VS Code with C# Dev Kit. To opt out, set the EnableWinUIDesignTimeGeneratedXamlCompileItems property to false. N/A, build .targets change

To see everything that's new and changed, see the full Windows App SDK 2.6.4 release notes.

Try it out

  • Download the 2.6.4 NuGet package to use WinAppSDK 2.6 in your app.
  • Download and update the WinUI Gallery to see the WinUI 3 updates firsthand.

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.5.4-exp

Windows App SDK 2.5 Experimental is the latest experimental release, adding new Windows AI capabilities, code-based theme resource bindings and DataTemplate construction, the new TableView and Chart controls, and expanded WinUI 3 inking support. It follows Windows App SDK 2.5.1 stable and brings forward the changes from that release alongside the experimental-only additions below.

What's new in WinAppSDK 2.5 Experimental:

  • Windows AI device selection. New AIComputeDevice APIs let apps choose the default, CPU, or NPU execution device for text recognition. App Content Index image indexing can use the same preference for OCR through ContentRegionImageOptions.PreferredTextRecognizerDevice.
  • AI Speech and language model updates. New speech recognition factories improve model configuration and creation, while updated audio, streaming, and continuous recognition APIs expand speech scenarios. Language model APIs now expose model identity, low-rank adapter compatibility, and response statuses for game mode and low video memory.
  • Theme resource binding from code. The experimental FrameworkElement.SetThemeResourceBinding API lets apps create the equivalent of a {ThemeResource} binding programmatically.
  • Delegate-based DataTemplate construction. A new experimental DataTemplate constructor accepts an app-provided delegate that creates the template's element subtree.
  • TableView control. The experimental TableView control is now available in the public WinMDs, with grouping, templated group headers, sorting and filtering, resizable columns, and optional cell and header tooltips.
  • Chart control. A new experimental WinUI 3 Chart control presents Cartesian data as line, area, and bar series, with configurable axes, legends, labels, and markers.
  • WinUI 3 inking updates. New InkPresenter.ActivateCustomDrying and InkSynchronizer APIs let apps render committed ink themselves, and InkToolbar now targets an InkPresenter directly.

Bugs fixed:

  • Fixed an access violation that could occur when reading InkPresenter.StrokeContainer while custom drying was active.
  • Fixed InkCanvas presenter sizing under a RenderTransform.
  • Fixed a WinUI resource-tracking issue that could cause memory usage to grow when apps repeatedly created visual-state storyboards or resolved static or theme resources.
  • Improved cleanup of unreachable native WinUI objects in .NET apps after tab or page teardown.

To see everything that's new and changed, see the full Windows App SDK 2.5 Experimental release notes.

Try it out

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.5.1

Windows App SDK 2.5.1 adds Windows Error Reporting support for self-contained .NET MSIX apps, introduces limited-access app content search APIs, and includes reliability fixes across WinUI 3, input, composition, deployment, and Windows AI.

What's new in WinAppSDK 2.5.1:

  • Windows Error Reporting support. Self-contained .NET MSIX apps can now use the windows.diagnosticServiceModule package-manifest extension to declare diagnostic modules, allowing Windows Error Reporting to load them and collect actionable crash dumps.
  • Limited-access AppContentSearch APIs. Apps with a limited-access feature token can use the new AppContentIndex APIs to index text and images, perform lexical queries, and use semantic matching on supported NPU-enabled devices. The APIs support semantic search and retrieval-augmented generation scenarios.

Bug fixes:

Bug Fix Runtime Compatibility Change
Fixed a crash in windowed-popup input handling when a focus or pointer event was processed after the popup's island had been disposed. PointerInputProcessor_ReleaseCaptureOnDisposedIsland
Fixed a crash in NavigationView when resizing the control could produce a negative pane MaxHeight. NavigationView_UpdatePaneLayoutNegativeMaxHeight
Fixed an issue where the property set returned by ElementCompositionPreview.GetPointerPositionPropertySet stopped updating while a pointer was pressed. PointerPositionPropertySet_UpdateWhilePressed
Fixed a crash in NavigationView when an expanded item's flyout was shown after the item had been collapsed or recycled. NavigationViewItem_DeferredFlyoutShowStaleState
Fixed a fail-fast when a KeyboardAccelerator used an OEM or punctuation key and displayed the accelerator shortcut label. KeyboardAccelerator_OemKeyNoFailFast
Fixed a fatal process exit during XAML shutdown in apps hosting WinUI 3 on more than one UI thread. WindowsXamlManager_ActivationFactoryCacheResetRace
Fixed an issue where a CommandBar with no secondary commands could show an empty overflow button at fractional display scales such as 175%. CommandBar_SpuriousOverflowButtonAtFractionalScale
Fixed an issue that prevented apps using the System Composition Engine from calling VisualInteractionSource.CreateFromIVisualElement. CompositionEngine_SwitcherSeptemberFixes
Fixed effect graphs and SceneLighting rendering for apps using the System Composition Engine. CompositionEngine_SwitcherSeptemberFixes
Fixed InputPointerSource.ActivationBehavior not honoring NoActivate when using the System Composition Engine. CompositionEngine_SwitcherSeptemberFixes
Fixed CompositionEngine selection behavior for null inputs and no-op selections. CompositionEngine_SwitcherSeptemberFixes
Fixed cursor customization for lifted input when using the System Composition Engine. CompositionEngine_SwitcherSeptemberFixes
Fixed ICompositionObject queries on gradient stop collections when using the System Composition Engine. N/A, operating system composition fix
Fixed ContentExternalOutputLink border and background behavior when using the System Composition Engine. N/A, operating system composition fix
Fixed access to VisualReferenceController when using the System Composition Engine. N/A, operating system composition fix
Fixed a registration issue that could occur when installing the Windows App SDK. N/A, deployment registration fix
Fixed an issue where Video Super Resolution could fail during initialization or inference with the updated ONNX Runtime dependency. N/A, dependency compatibility update

To see everything that's new and changed, see the full Windows App SDK 2.5.1 release notes.

Try it out

  • Download the 2.5.1 NuGet package to use WinAppSDK 2.5 in your app.
  • Download and update the WinUI Gallery to see the WinUI 3 updates firsthand.

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.4.1-exp

Windows App SDK 2.4 Experimental (2.4.1-experimental) 🧪

Windows App SDK 2.4 Experimental is the latest experimental release, headlined by inking support for WinUI 3. It follows Windows App SDK 2.4.0 stable and generally brings forward the changes from that release alongside the experimental-only addition below.

What's new in WinAppSDK 2.4 Experimental:

  • Inking support for WinUI 3. The new InkCanvas, InkToolbar, and InkPresenter APIs add pen and touch input, clipboard and high-contrast support, stroke input, and unprocessed input to WinUI 3 apps.

To see everything that's new and changed, see the full Windows App SDK 2.4 Experimental release notes.

Try it out

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.4.0

Windows App SDK 2.4.0

Windows App SDK 2.4.0 is the latest stable release on the 2.x line, adding expanded input support, more precise LanguageModel response statuses, and targeted reliability fixes across input, Storage Pickers, MRT Core, app runtime isolation, composition, and XAML tooling.

What's new in WinAppSDK 2.4.0:

  • Expanded input support. WinUI 3 apps can now use operating system touchpad and mouse haptics through Windows.Devices.Haptics, along with touchpad single-finger panning, when supported by the operating system and hardware.
  • More precise LanguageModel response statuses. The new LanguageModelResponseStatus.UnsupportedLanguage and LanguageModelResponseStatus.LanguageMismatch values let apps distinguish unsupported-language and input/output-language mismatch conditions from generic errors.

Bug fixes:

Bug Fix Runtime Compatibility Change
Fixed a crash that could occur when a touch or pen contact left a scrollable area with precise timing. InputPointerSource_DepartingScrollInputCrashFix
Fixed an issue where the Storage Pickers left the calling WinUI app window without keyboard focus after the file dialog closed. The app now restores its previous focus. See GitHub issue microsoft/WindowsAppSDK#​6505. StoragePickers_RestoreFocusAfterDialogCloses
Fixed a regression where MrmGetFilePathFromName returned ERROR_FILE_NOT_FOUND when the PRI file didn't exist instead of returning the documented fallback path. See GitHub issue microsoft/WindowsAppSDK#​5940. ResourceManager_RestoreDefaultFallbackPath
Fixed an issue where MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY could be inherited by child processes, disrupting MRT Core and catalog lookups. See GitHub issue microsoft/WindowsAppSDK#​5987. WindowsAppRuntime_BaseDirectoryIsolation
Fixed a crash when apps using the System Composition Engine called VisualInteractionSource.TryRedirectForManipulation. N/A, operating system composition bridge fix
Fixed the access modifier on the generated C# entry point helper when DISABLE_XAML_GENERATED_MAIN is defined. See GitHub issue microsoft/microsoft-ui-xaml#​11245. N/A, build-time tooling change

To see everything that's new and changed, see the full Windows App SDK 2.4.0 release notes.

Try it out

  • Download the 2.4.0 NuGet package to use WinAppSDK 2.4 in your app.
  • Download and update the WinUI Gallery to see the WinUI 3 updates firsthand.

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.3.2-expA

Windows App SDK 2.3 Experimental A (2.3.2-experimentalA) 🧪

Windows App SDK 2.3 Experimental A is the latest experimental release, headlined by new DPI-aware window sizing from XAML, a substantial round of App Content Index indexing and reliability improvements, and additional Windows AI and speech APIs. It builds on the Windows App SDK 2.3.1 stable release and adds the experimental-only work described below.

What's new in WinAppSDK 2.3 Experimental A:

  • Window.Width and Window.Height. New properties give apps a DPI-aware way to get and set a window's size in logical (client) pixels directly from code or markup, without reaching through Window.AppWindow and doing manual logical-to-physical DPI conversion. Companion Window.MinWidth, Window.MinHeight, Window.MaxWidth, and Window.MaxHeight properties constrain the window's size.
  • App Content Index improvements. The experimental App Content Index APIs add faster batch indexing via AppContentIndexer.BatchAddOrUpdate, direct indexing of bitmap and image-stream content (with OCR and semantic options), static ranking boosts for individual content items or regions, ICU-based multilingual tokenization, and automatic recovery from index corruption. Indexing and query paths are also substantially faster, with more stable lexical ranking.
  • Structured JSON generation. A new LanguageModel.GenerateStructuredJsonResponseAsync API lets apps generate structured JSON output from the on-device language model, making it easier to get typed, machine-readable results back from a prompt.
  • Speech recognition cleanup. The experimental SpeechAudioProvider now implements IClosable, so apps can deterministically release the provider with Close/Dispose when they finish streaming audio.

To see everything that's new and changed, see the full Windows App SDK 2.3 Experimental A release notes.

Try it out

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.3.1

Windows App SDK 2.3.1

Windows App SDK 2.3.1 is the latest stable release on the 2.x line, with a new structured JSON output API for Phi Silica, the XamlOptionalChanges API for opting into XAML breaking changes, an unstable CompositionEngine Limited Access Feature, Video Super Resolution improvements, ARM64EC support for Windows ML, a broad set of XAML performance optimizations, and a batch of reliability fixes.

What's new in WinAppSDK 2.3.1:

  • Structured JSON output for Phi Silica. The new LanguageModel.GenerateStructuredJsonResponseAsync API generates language-model responses constrained to a caller-supplied JSON Schema, so apps get well-formed, schema-conformant output instead of free-form text they have to parse themselves.
  • XamlOptionalChanges. A new API that lets apps opt into optional breaking changes before XAML initialization. In the same release, the DISABLE_XAML_GENERATED_MAIN preprocessor constant now renames the generated main() method (C#: XamlGeneratedProgram.XamlGeneratedMain(); C++/WinRT: wXamlGeneratedMain()) instead of removing it, so a custom main() can invoke the default implementation. See PR microsoft/microsoft-ui-xaml#​11110.
  • CompositionEngine (Limited Access Feature). A new, unstable Limited Access Feature that lets apps opt into using the OS as the engine for the Composition APIs.
  • Video Super Resolution improvements. Fixed NPU detection, added CPU support, and improved performance for Video Super Resolution.
  • Windows ML: ARM64EC support. Windows ML now supports ARM64EC, alongside a fix to execution-provider enumeration in certain scenarios.
  • XAML performance optimizations. This release adds a broad set of startup, styling, and resource-lookup optimizations. Several are opt-in through the DefaultStyleOptimizations and OptimizeApplyStyles XamlChangeIds, including optimized XamlControlsResources styles, a lighter FontIcon/BitmapIcon visual tree, and faster ThemeResource and ResourceDictionary lookups.
  • AI IntelliSense documentation. Added IntelliSense documentation for the stable APIs in the Microsoft.WindowsAppSDK.AI NuGet package.

Bug fixes:

Bug Fix Runtime Compatibility Change
Fixed ApplicationData.GetForUnpackaged().LocalSettings() opening a registry key at a roaming path (HKCU\SOFTWARE\publisher\product) instead of a machine-local one, so unpackaged app settings now persist in the correct location. See GitHub issue microsoft/WindowsAppSDK#​6559. ApplicationData_GetForUnpackaged_LocalSettings
Fixed a crash that could repeatedly bring down backgroundTaskHost.exe when a background task had no stored CLSID, and added graceful handling when CoCreateInstance fails. See GitHub issue microsoft/WindowsAppSDK#​5870. UniversalBGTask_RunCrash
Fixed windowed and non-windowed flyouts appearing misaligned (about one item-height above the parent item) for side placements when they open upward near the bottom of the screen. Flyout_SidePlacementFlipUpAlignmentFix
Fixed a crash in MediaPlayerPresenter when the GPU device is lost during media playback event handling. MediaPlayerPresenter_DeviceLostCrash
Fixed a use-after-free crash in CPopupRoot::ReplayPointerUpdate when a popup is closed synchronously during pointer-event replay. CPopupRoot_ReplayPointerUpdateCrash
Fixed a crash (null LayoutState dereference) in UniformGridLayout and FlowLayout that could occur when a collection change was raised on an ItemsRepeater that was no longer loaded. UniformGridLayoutFlowLayout_OnItemsChangedNullLayoutStateCrash

To see everything that's new and changed, see the full Windows App SDK 2.3.1 release notes.

Try it out

  • Download the 2.3.1 NuGet package to use WinAppSDK 2.3 in your app.
  • Download and update the WinUI Gallery to see the WinUI 3 updates firsthand.

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.2.2-exp9

Windows App SDK 2.2 Experimental 9 (2.2.2-experimental9) 🧪

Windows App SDK 2.2 Experimental 9 is the latest experimental release. It ships alongside Windows App SDK 2.2.0 stable and generally brings over the changes from that release; the highlights below describe the experimental-only additions.

What's new in WinAppSDK 2.2 Experimental 9:

  • Language Model APIs on GPU [Experimental]. The Language Model APIs now run on non-Copilot+ PCs equipped with a supported GPU, bringing local language model capabilities to a broader range of Windows 11 devices. Supported hardware includes NVIDIA GeForce RTX 30 series and newer with 6+ GB vRAM. GPU inference requires Developer Mode to be enabled and a Windows Insider Experimental Channel build. The GPU model is not pre-installed; it is downloaded on demand via EnsureReadyAsync through Windows Update. Apps should check GetReadyState and display a consent dialog before triggering the download. Users can manage the model at Settings > System > AI Components. For responsible AI guidance, see the new Transparency Note: Language Model APIs on Non-Copilot+ PCs.
  • Speech Recognition APIs [Experimental]. New on-device speech recognition APIs in Microsoft.Windows.AI.Speech enable both batch and streaming speech-to-text. BatchRecognition recognizes a complete audio source in a single call, and StreamingRecognition raises Recognizing and Recognized events. Audio can be sourced from a device (AudioConfiguration.FromAudioDevice), file (FromFile), input stream (FromStream), or pushed by the caller via SpeechAudioProvider (16 kHz, 16-bit, single-channel PCM). The on-device model is managed via SpeechRecognitionModel.EnsureReadyAsync / TryCreateAsync, with download and load progress reported through SpeechRecognitionModelProgress.
  • New NpuType API. A new Microsoft.Windows.Workloads.NpuType enum surfaces the NPU class on the current device (for example, Qnn, Lnl, Stx, Win365, Unknown, None), so apps and Workloads infrastructure can route AI workloads to the appropriate execution path.

This release also rolls forward all changes from the 2.2.0 stable release: the new Microsoft.Windows.AI.Video.VideoScaler Video Super Resolution API, the new Microsoft.Windows.Storage.ApplicationData.GetForUnpackaged() entry point for unpackaged apps, the new XamlBindingHelper boxing-free setter overloads, and the WinUI / Windows ML reliability fixes shipped in 2.2.0.

New or updated APIs (since 2.1 Experimental 8):

Microsoft.UI.Xaml

    Setter
        ValueProperty
Microsoft.UI.Xaml.Markup

    XamlBindingHelper
        SetPropertyFromColor
        SetPropertyFromCornerRadius
        SetPropertyFromThickness
Microsoft.Windows.AI.Speech

    AudioConfiguration
    BatchRecognition
    SpeechAudioProvider
    SpeechContract
    SpeechRecognitionModel
    SpeechRecognitionModelProgress
    SpeechRecognitionModelProgressStatus
    SpeechRecognitionModelResult
    StreamingRecognition
    StreamingRecognizedEventArgs
    StreamingRecognizingEventArgs
Microsoft.Windows.AI.Text.Experimental

    LanguageModelExperimental
        CompressPromptAsync
        GenerateResponseAsync
        GenerateResponseFromEmbeddingsAsync
 ... (truncated)

## 2.2.0

## Windows App SDK 2.2.0

WinAppSDK 2.2.0 is the latest stable servicing release for 2.0, with a new Windows AI video upscaling API, a first-class `ApplicationData` entry point for unpackaged apps, additions to `XamlBindingHelper`, and a batch of WinUI and Windows ML reliability fixes.

### What's new in WinAppSDK 2.2.0:

- **Video Super Resolution AI API.** The new `Microsoft.Windows.AI.Video.VideoScaler` API delivers real-time video enhancement through advanced AI upscaling, optimized for streams featuring people in conversation. It enables developers to provide sharper, clearer visuals across conferencing, streaming, and editing platforms, even under poor network conditions. The API supports customization of output resolution, frame rate, and regions of interest, with compatibility for multiple video formats including BGR, RGB, and NV12. `VideoScaler` is disposable, and includes a capability check so apps can validate VSR support at runtime. Explicit Windows ML initialization is not required.
- **New `ApplicationData` API for unpackaged apps.** `Microsoft.Windows.Storage.ApplicationData.GetForUnpackaged()` gives unpackaged apps a first-class WinRT entry point to per-user / per-machine application data, matching the surface previously available only to packaged apps. This simplifies future packaged ↔ unpackaged migration and removes the need for Registry-API workarounds.
- **New `XamlBindingHelper` APIs.** Added boxing-free value setter overloads to `XamlBindingHelper` (`SetPropertyFromThickness`, `SetPropertyFromCornerRadius`, `SetPropertyFromColor`) and exposed the `Setter.ValueProperty` dependency property.

### Bug fixes:

| Bug fix | [Runtime Compatibility Change](https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.windows.applicationmodel.windowsappruntime.runtimecompatibilityoptions.disabledchanges?view=windows-app-sdk-2.0) |
|---------|------------------------------------|
| Fixed a crash in `RenderTargetBitmap` when the target element leaves the visual tree (for example, a popup closes) before `PreCommit` completes. `RenderAsync` now returns `E_ABORT` instead of crashing. | RenderTargetBitmap_PreCommitCrashOnTreeLeave |
| Fixed a use-after-free crash in `ScrollView` when the control is destroyed while its hide-indicators timer tick is still pending. See [microsoft/microsoft-ui-xaml#​10514](https://github.com/microsoft/microsoft-ui-xaml/issues/10514). | ScrollView_HideIndicatorsTimerUseAfterFree |
| Fixed a potential crash in `Microsoft.UI.Xaml.dll!DirectUI::DXamlCore::GetPeerPrivate` caused by attempting to access an object scheduled to be freed. | GetPeerPrivate_UseAfterFree |
| Fixed an issue where `Microsoft.UI.System.ThemeSettings` could crash an app if it was destroyed on a background thread (for example, when destroyed by the .NET garbage collector). | ThemeSettings_OffThreadDestructorFix |
| Fixed a crash that could occur on certain devices when active touch contacts were canceled by input hardware, such as when pen input overrides them. | InputPointerSource_PointerCancelCrashFix |
| Fixed an issue where sparse-packaged apps were unable to discover module-specific PRI files. See [microsoft/WindowsAppSDK#​6375](https://github.com/microsoft/WindowsAppSDK/issues/6375). | MRTCore_SparsePackagedPriFallback |
| Fixed a string ownership bug when using the Flat-C Windows ML Catalog API. | WindowsMLFlatCCatalog_CallbackStringOwnership |
| Fixed a potential issue in Windows ML during process shutdown. | WindowsML_ComRundownFix |
| Fixed potential COM initialization and teardown issues in Windows ML. | WindowsML_ComInitializationFix |

### New or updated APIs (since 2.1.3):

Microsoft.UI.Xaml

Setter
    ValueProperty

Microsoft.UI.Xaml.Markup

XamlBindingHelper
    SetPropertyFromColor
    SetPropertyFromCornerRadius
    SetPropertyFromThickness

Microsoft.Windows.AI.Video

VideoScaler
VideoScalerOptions
VideoScalerResult
VideoScalerStatus

Microsoft.Windows.Storage
... (truncated)

2.1.4-exp8

Windows App SDK 2.1.4-Experimental8 (2.1.4-experimental8) 🧪

Windows App SDK 2.1 Experimental 8 ships alongside Windows App SDK 2.1.3 stable. It generally brings forward the changes in 2.1.3 (TitleBar custom drag-region APIs, the Phi Silica LoRA API on the stable surface, AICapabilities.HasAICapability, expanded Windows ML execution-provider support, ONNX Runtime 1.24.6, and the 2.1.3 bug fix batch) and adds one experimental-only refinement to the Phi Silica structured JSON output API.

What's new in WinAppSDK 2.1 Experimental 8:

  • Strongly typed result and status for structured JSON responses [Experimental]. LanguageModelExperimental.GenerateStructuredJsonResponseAsync (introduced in 2.0 Experimental 7) now returns a dedicated GenerateStructuredJsonResponseResult type with a GenerateStructuredJsonResponseStatus property, instead of the generic LanguageModelResponseResult / LanguageModelResponseStatus pair. The new status enum is specific to schema-constrained generation: it includes a ResponseInvalidJson value for cases where the model output did not satisfy the requested JSON schema, separate from generic language-model response failures.
  • As part of that split, the ResponseInvalidJson value has been removed from the stable LanguageModelResponseStatus enum. Apps that handled ResponseInvalidJson from LanguageModelResponseStatus should move that handling onto the new GenerateStructuredJsonResponseStatus returned by GenerateStructuredJsonResponseAsync.

Brought forward from 2.1.3 stable

This experimental release also rolls forward the 2.1.3 stable changes, including the new TitleBar custom drag-region APIs, the Phi Silica LoRA API on the stable surface, AICapabilities.HasAICapability, the Windows ML execution-provider improvements, the ONNX Runtime 1.24.6 bump, and the full 2.1.3 bug fix batch. See the Windows App SDK 2.1.3 release notes for details.

To see everything that's new and changed, see the full Windows App SDK 2.1 Experimental 8 release notes.

Try it out

Getting Started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

2.1.3

Windows App SDK 2.1.3

Windows App SDK 2.1.3 is the latest stable servicing release on the 2.x line, with new TitleBar drag-region APIs in WinUI, the LoRA API for Phi Silica promoted to the stable surface, a new Copilot+ PC detection API, expanded Windows ML execution-provider support, an ONNX Runtime update, and a batch of reliability fixes.

What's new in WinAppSDK 2.1.3:

  • TitleBar custom drag regions. TitleBar now recursively walks TitleBar.Content and automatically excludes interactive controls from the drag region while keeping empty gaps draggable by default. Three new APIs (TitleBar.IsDragRegion attached property, TitleBar.AutoRefreshDragRegions, and TitleBar.RecomputeDragRegions()) give developers explicit control when the default behavior isn't sufficient. See PR microsoft/microsoft-ui-xaml#​10936 and tracking issue microsoft/microsoft-ui-xaml#​10421.
  • Phi Silica LoRA API on the stable surface. Developers can now fine-tune the on-device Phi Silica language model with their own LoRA adapters from the stable API surface, using LanguageModelLowRankAdapter.CreateFromPath and LanguageModelOptions.LowRankAdapter. See Phi Silica LoRA for details.
  • AICapabilities.HasAICapability is a new API that lets third-party applications determine whether the device is a Copilot+ PC.
  • Windows ML execution-provider improvements. This release adds support for multiple execution providers within a single MSIX package, discovery of execution providers delivered as framework packages, and a new selection mode for more flexible deployment configurations.
  • The version of ONNX Runtime has been updated to 1.24.6.

Bug fixes:

Bug Fix Runtime Compatibility Change
Fixed a memory leak in ItemsRepeater where recycled elements were never garbage collected due to a reference cycle through the RecyclePool, which could also cause crashes in InvalidateChildrenMeasure. ItemTemplateWrapper_RecyclePoolLeak
Fixed a crash where an implicit Show/Hide animation completion callback could access a destroyed CUIElement, causing an access violation. The callback now uses a weak reference to safely handle the case where the element is destroyed before the animation completes. Animation_FixImplicitHideAnimationCrash
Fixed an issue where windowed popup content opened in a XAML Island did not respect OverrideScale, causing content to appear oversized and clipped. See GitHub issue microsoft/microsoft-ui-xaml#​11000. Popup_WindowedPopupOverrideScale
Fixed a fail-fast crash caused by re-entrant dispatch during cross-apartment COM release operations in UIAffinityReleaseQueue::DoCleanup. UIAffinityReleaseQueue_PauseDispatchDuringCleanup
Fixed ambiguous module lookup in WinUI when multiple modules with the same name are loaded in the same process. GetModuleHandleW has been replaced with GetModuleHandleExW so the correct module is resolved by address. GetModuleHandle_FixAmbiguousModuleLookup
Fixed an integer divide-by-zero crash in UniformGridLayout::GetMajorSize when an ItemsRepeater is laid out in an available width narrower than one item's minor stride. UniformGridLayout_GetItemsPerLineDivideByZero
Fixed a potential crash when a package has been uninstalled prior to being processed. PackageManager_FixCrash
Fixed an issue where GetReadyState could return incorrect error codes (for example, DisabledByUser or NotSupportedOnCurrentSystem) when required packages were not yet deployed. The API now correctly reports NotReady in this scenario, improving diagnostic clarity. ModelInitialization_GetReadyStateAvailabilityGuard
Fixed an issue where XAML compiler errors were silently lost when using dotnet build, showing only MSB3073: exited with code 1 instead of the actual error messages. See GitHub issue microsoft/microsoft-ui-xaml#​9813. N/A, build-time XAML compiler tooling change

To see everything that's new and changed, see the full Windows App SDK 2.1.3 release notes.

Try it out

  • Download the 2.1.3 NuGet package to use WinAppSDK 2.1 in your app.
  • Download and update the WinUI Gallery to see the WinUI 3 updates firsthand.

Getting started

To get started using Windows App SDK to develop Windows apps, check out the following documentation:

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Bumps Microsoft.WindowsAppSDK from 2.0.1 to 2.6.4

---
updated-dependencies:
- dependency-name: Microsoft.WindowsAppSDK
  dependency-version: 2.6.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: nuget-minor-and-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added .NET Pull requests that update .NET code dependencies Pull requests that update a dependency file labels Nov 1, 2026
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github-actions Bot commented Nov 1, 2026 •

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