[BUG] Cowork "Virtualization is not available" on Windows 10 Pro — VM never initializes, no logs created

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 displays "La virtualisation n'est pas disponible" (Virtualization is not available) despite all virtualization features being fully enabled and verified.

The %APPDATA%\Claude folder does not exist at all — the VM never attempts to initialize. No logs are generated.

What Should Happen?

Cowork should detect that all virtualization features are enabled and successfully start the VM workspace.

Error Messages/Logs

No logs exist. %APPDATA%\Claude folder does not exist at all — the VM never attempts to initialize.
CoworkVMService is running, all virtualization features confirmed enabled.

Steps to Reproduce

1. Install Claude Desktop v1.1.8629 from claude.ai/download on Windows 10 Pro x64
2. Verify Hyper-V, Virtual Machine Platform, Windows Hypervisor Platform all Enabled (Get-WindowsOptionalFeature)
3. Verify CoworkVMService is Running (Get-Service CoworkVMService)
4. Verify Task Manager → CPU → Virtualization: Enabled
5. Open Claude Desktop → Cowork tab
6. Observe "La virtualisation n'est pas disponible" error
7. %APPDATA%\Claude folder does not exist — no logs generated
8. Tried: full uninstall via Remove-AppxPackage, cleanup AppData, reinstall as admin — same result

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1.8629 (befdfc) — Claude Desktop, not Claude Code CLI

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Related to #25136, #27316, #27420, #29887, #32004.

System verification:

• Hyper-V: Enabled
• Virtual Machine Platform: Enabled
• Windows Hypervisor Platform: Enabled
• CoworkVMService: Running
• Task Manager → Virtualization: Enabled
• OS: Windows 10 Pro x64
• %APPDATA%\Claude folder does not exist — VM never initializes, no logs generated

Tried: full uninstall (Remove-AppxPackage), AppData cleanup, reinstall from claude.ai/download as admin — same result.