[BUG] Cowork fails with Plan9 share 'd': HRESULT 0x80070005 - Windows (Microsoft Store install)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Cowork workspace fails to start with error:
"failed to add Plan9 share 'd': HcsWaitForOperationResult failed with HRESULT 0x80070005: {"Error":-2147024891,"ErrorMessage":""}"

This has never worked on this machine since first install.

What Should Happen?

Cowork workspace should start successfully.

Error Messages/Logs

failed to add Plan9 share 'd': HcsWaitForOperationResult failed with HRESULT 0x80070005: {"Error":-2147024891,"ErrorMessage":""}

Steps to Reproduce

1. Install Claude Desktop from Microsoft Store
2. Open Claude Desktop
3. Click on Cowork tab
4. Error appears immediately

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

N/A - using Claude Desktop (Microsoft Store)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Tried the following fixes with no success:

1. Restarted Claude and PC multiple times
2. Ran icacls on vm_bundles folder to grant SYSTEM:F permissions (17 files processed, 0 errors)

Path: C:\Users\Joshua\AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\vm_bundles

1. Deleted vm_bundles folder entirely and let Claude re-download
2. Restarted PC after each step

Install method: Microsoft Store