WCR: LAF com.microsoft.windows.ai.languagemodel is missing from Windows

[riverar]

Describe the bug

When attempting to use Phi Silica APIs, an exception is thrown:

Limited Access Feature is not available: com.microsoft.windows.ai.languagemodel. Status: 3'

Windows Insider and Production builds appear to be missing this LAF, rendering all Phi Silica APIs useless.

Steps to reproduce the bug

1. Start AI Dev Gallery
2. Observe generative samples do not work

Expected behavior

No response

Screenshots

No response

NuGet package version

Windows App SDK 1.8.1: 1.8.250916003

Packaging type

Packaged (MSIX)

Windows version

Insider Build (xxxxx)

IDE

Visual Studio 2022-preview

Additional context

No response

[riverar]

Looks like this LAF is only officially available in Canary builds (27954+), which is unacceptable.

Workaround for everyone else:

1. Run the commands:

psexec -i -s C:\windows\system32\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModel\LimitedAccessFeatures\com.microsoft.windows.ai.languagemodel" /ve /d "lEvcaWXLeE7hlhRjHesd6aYV2t/sIbX1KbCLQ3cg+ts=" /reg:32 /f
psexec -i -s C:\windows\system32\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModel\LimitedAccessFeatures\com.microsoft.windows.ai.languagemodel" /ve /d "lEvcaWXLeE7hlhRjHesd6aYV2t/sIbX1KbCLQ3cg+ts=" /reg:64 /f

2. Reboot.

[danielkornev]

@riverar but what about separate apps that want to use Phi Silica?

On Windows 11 25H2 (Release channel), instructions above fixed AI Dev Gallery, but they don't make this code below work - Access Denied no matter what branch of Windows App SDK is used (1.8 production or 2.0 experimental):

[riverar]

@danielkornev I'm seeing that too; I haven't had time to fully debug it yet.

Some tips:

• If you're unpackaged, that's not supported anymore.
• If you're packaged w/ full trust, verify you have systemAIModels rescap.
• If you're packaged w/o full trust, ensure you have the systemAIModels and packageManagement rescaps.
• Double check Settings > Privacy and Security >Text and image generation > Let apps use [...] is toggled to On.

[riverar]

Update: Seems to be working well now, perhaps some updates were missing?

Tested on 26220.6760 and 6772 / 2025-09 Phi Silica version 1.2509.1022.0 ✅

[danielkornev]

ah, so this won't work on 25H2 (26200.6725)?

[riverar]

ah, so this won't work on 25H2 (26200.6725)?

Should work the same. Phi Silica APIs are technically GA.