**[BUG] Cowork: sessiondata.vhdx not found — path mismatch between copy destination and expected location**

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 fails to start with: "failed to set session disk path: session disk not found: ...sessiondata.vhdx"

The logs show the VM copies files to:
C:\Users\User\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\

But then looks for sessiondata.vhdx in:
C:\Users\User\AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\vm_bundles\claudevm.bundle\

These are two different paths so sessiondata.vhdx is never found. The "Reinstall workspace" button appears to fix it once but the error returns on next launch. After that, auto-reinstall is skipped entirely.

What Should Happen?

Cowork should start successfully. The VM files should be copied to and read from the same path consistently.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop from claude.ai/download (MSIX on Windows)
2. Open Cowork tab
3. Observe error banner: "failed to set session disk path: session disk not found"
4. Click "Reinstall workspace" — appears to fix it but error returns on next launch
5. Manually deleting claudevm.bundle folder and relaunching does not fix it

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Desktop 1.9255.2.0

Platform

Other

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_