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Wasdk/2.0/2.0exp6 release notes (#6425)
* 2oexp6 starter release notes * winml release notes * remove internal flat c lingo * Revert accidental 1.8 release notes changes from exp6 branch Co-authored-by: Copilot <[email protected]> * AIFabric release notes * add API diff * add appcontentsearch content * Update hub/apps/windows-app-sdk/release-notes/windows-app-sdk-2-0.md * Update hub/apps/windows-app-sdk/downloads.md * Update hub/apps/windows-app-sdk/release-channels.md --------- Co-authored-by: Copilot <[email protected]> Co-authored-by: Roy <[email protected]>
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‎hub/apps/windows-app-sdk/downloads.md‎

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### Windows App SDK 2.0 Experimental
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| Version | Runtime downloads |
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|--|--|
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| **2.0 Experimental 6 (2.0.0-experimental6)** <br/> 03/13/2026 <br/> [Release notes](./release-notes/windows-app-sdk-2-0.md?pivots=experimental#version-20-experimental-6-200-experimental6) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F2.0.0-experimental6) | [Installer (x64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental6/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental6/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental6/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable (ZIP)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental6/Microsoft.WindowsAppRuntime.Redist.2.0.zip) |
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| **2.0 Experimental 5 (2.0.0-experimental5)** <br/> 02/13/2026 <br/> [Release notes](./release-notes/windows-app-sdk-2-0.md?pivots=experimental#version-20-experimental-5-200-experimental5) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F2.0.0-experimental5) | [Installer (x64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental5/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental5/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental5/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable (ZIP)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental5/Microsoft.WindowsAppRuntime.Redist.2.0.zip) |
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| **2.0 Experimental 4 (2.0.0-experimental4)** <br/> 01/13/2026 <br/> [Release notes](./release-notes/windows-app-sdk-2-0.md?pivots=experimental#version-20-experimental-4-200-experimental4) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F2.0.0-experimental4) | [Installer (x64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental4/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental4/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental4/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable (ZIP)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental4/Microsoft.WindowsAppRuntime.Redist.2.0.zip) |
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| **2.0 Experimental 3 (2.0.0-experimental3)** <br/> 11/11/2025 <br/> [Release notes](./release-notes/windows-app-sdk-2-0.md?pivots=experimental#version-20-experimental-3-200-experimental3) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F2.0.0-experimental3) | [Installer (x64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental3/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental3/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental3/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable (ZIP)](https://aka.ms/windowsappsdk/2.0/2.0.0-experimental3/Microsoft.WindowsAppRuntime.Redist.2.0.zip) |

‎hub/apps/windows-app-sdk/release-channels.md‎

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| **✅** | **Stable** | Production-ready channel intended for apps in market. Includes only stable, supported APIs suitable for long-term use. | No more than every six months <br/> *(plus servicing updates as needed)* | Yes | **1.8.5 (1.8.260204001)** <br/> Released: 02/10/2026 <br/> [Release notes](./release-notes/windows-app-sdk-1-8.md?pivots=stable#version-185-18260209005) |
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| **❇️** | **Preview** | Early look at the next Stable release. May introduce breaking API changes before final stabilization. | At least one preview for each Stable release | No | **2.0 Preview (2.0-preview)** <br/> Released: 02/13/2026 <br/> [Release Notes](release-notes/windows-app-sdk-2-0.md#windows-app-sdk-200-preview1-release-notes) ** |
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| **🔄** | **Experimental** | Early-stage features under active development. APIs may change, be removed, or never ship. Intended for exploration and feedback only. | Published as needed to gather feedback on prototypes and early designs | No | **2.0 Experimental 4 (2.0.0-experimental4)** <br/> Released: 01/13/2026 <br/> [Release notes](./release-notes/windows-app-sdk-2-0.md?pivots=experimental#version-20-experimental-4-200-experimental4) |
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| **🔄** | **Experimental** | Early-stage features under active development. APIs may change, be removed, or never ship. Intended for exploration and feedback only. | Published as needed to gather feedback on prototypes and early designs | No | **2.0 Experimental 6 (2.0.0-experimental6)** <br/> Released: 03/13/2026 <br/> [Release notes](./release-notes/windows-app-sdk-2-0.md?pivots=experimental#version-20-experimental-6-200-experimental6) |
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For a comprehensive list of all current and previous releases of the Windows App SDK, including download locations, see [Downloads for the Windows App SDK](downloads.md).

‎hub/apps/windows-app-sdk/release-notes/windows-app-sdk-2-0.md‎

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:::zone pivot="experimental"
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## Version 2.0 Experimental 6 (2.0.0-Experimental6)
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Released: **March 13, 2026** <br><br>
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<details><summary>Windows ML CMake support</summary>
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>
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> Windows ML can now be used from C++ projects using CMake. See the [Get started page](/windows/ai/new-windows-ml/get-started) to learn more.
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>
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</details>
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<details><summary>Updated ONNX Runtime</summary>
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> The version of ONNX Runtime has been updated to 1.24.2. See [ONNX Runtime versions](/windows/ai/new-windows-ml/onnx-versions) for more info.
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>
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</details>
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<details><summary>Windows AI Language Model</summary>
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> * `NPUPowerMode` has been deprecated in favor of newer power management APIs.
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> * `GetReadyState` now gracefully returns `NotSupported` when the session broker is unavailable, instead of throwing an exception.
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>
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</details>
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<details><summary>Video Super Resolution</summary>
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> * Added NV12 output format support for Video Super Resolution.
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>
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</details>
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<details><summary>App Content Search</summary>
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> * Improved `DeleteIndex` reliability. Sometimes `DeleteIndex` would fail with ERROR_SHARING_VIOLATION.
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> * Fix for OCR Bounding boxes returning negative values in some edge cases.
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> * App Content Search are part of a separate `Microsoft.Windows.Search` package instead of being part of `Microsoft.Windows.AI package`.
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> * Fix for prefix search not working with short query strings.
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>
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> * New APIs and renames based on official API review.
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> * AppContentIndexer
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> * GetContentItemsRequiringReindexing
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> * Remove -> RemoveContentItem
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> * RemoveMultiple -> RemoveContentItems
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> * RemoveAllContentItems
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> * GetContentIndexingStatus -> GetContentItemStatus
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> * GetMultipleContentIndexingStatus -> GetContentItemStatuses
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> * GetContentItems
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> * AppCOntentIndexListener
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> * IndexingStatusChanged -> ContentItemStatusChanged
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> * AppIndexTextQuerySession
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> * UpdateQuery -> UpdateQueryPhrase
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> * MostRecentResult -> GetResult
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> * MostRecentResultChanged -> ResultChanged
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> * AppIndexImageQuerySession
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> * UpdateQuery -> UpdateQueryPhrase
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> * MostRecentResult -> GetResult
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> * MostRecentResultChanged -> ResultChanged
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> * AppManagedImageQueryMatch
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> * Subregion -> RegionOfInterest
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> * ContentItemStatusResult
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> * ReindexingStatus * ContentItemReindexingStatus
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> * TextQuerySessionResult
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> * IsValid
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> * ImageQuerySessionResult
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> * IsValid
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> * QueryContentItemsFilterFlags
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</details>
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<details><summary>Bug fixes</summary>
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> * Fixed `ImageDescription.DescribeAsync` failing with `InternalError` due to a race condition.
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</details>
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<details><summary>New or updated APIs</summary>
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> This release includes the following new and modified experimental APIs compared to 2.0.0-experimental5:
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> ```
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> Microsoft.Windows.Search.AppContentIndex
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> AppContentIndexer
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> GetContentItems
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> GetContentItemStatus
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> GetContentItemStatuses
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> RemoveAllContentItems
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> RemoveContentItem
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> RemoveContentItems
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> AppContentIndexListener
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> ContentItemStatusChanged
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> AppManagedImageQueryMatch
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> ContentItemErrorDetail
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> IndexCorruption
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> ContentItemReindexingStatus
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> Unspecified
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> QueryContentItemsFilterFlags
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> ```
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</details>
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## Version 2.0 Experimental 5 (2.0.0-Experimental5)
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Released: **February 13, 2026** <br><br>

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