microsoft / microsoft/WindowsAppSDK

Windows Update Broke PhiSilica

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area-WCR
Dominant language
C++
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Description

After updating to the latest Windows Insider this morning, one of which included an update to the PhiSilica model:

![Image](https://github.com/user-attachments/assets/6baaee6c-cb10-4050-902d-bc122879792b)

I get this error:

```
System.UnauthorizedAccessException
HResult=0x80070005
Message=Access is denied.

Access is denied.
```

When doing either chat inference or embeddings:

```csharp
var result = await languageModel.GenerateResponseAsync(options, prompt);
var embeddingResult = await languageModel.GenerateEmbeddingVectorAsync(...);
```

Using v1.7.250127003-experimental3.

Right now, nothing works.

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source file or test is identified. Start by reproducing both GenerateResponseAsync and GenerateEmbeddingVectorAsync with v1.7.250127003-experimental3 on the affected Windows Insider build, then trace the access-denied failure. Done means chat inference and embeddings work again without System.UnauthorizedAccessException.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
machine-learning, operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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