[BUG] Cowork tab not appearing on Windows 11 Home — yukonSilver not supported

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?

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported (as resolved)
• [x] I am using the latest version of Claude Desktop

Environment

• OS: Windows 11 Home (Build 26200.8037)
• Claude Desktop: latest version (freshly reinstalled)
• Plan: Pro
• CPU: AMD (virtualization enabled in BIOS)

What's Wrong?
The Cowork tab does not appear in Claude Desktop.
Only "Chat" and "Code" tabs are visible.
Cowork works fine on my other desktop PC with the same account.

Steps Already Taken

• Installed Hyper-V manually (via .bat script)
• Enabled Virtual Machine Platform ✅
• Enabled Windows Hypervisor Platform ✅
• Verified AMD-V is Enabled in BIOS ✅
• Fully uninstalled Claude Desktop + deleted %APPDATA%\Claude and %LOCALAPPDATA%\Claude
• Reinstalled latest Claude Desktop
• Rebooted multiple times

Log Output (%APPDATA%\Claude\logs\cowork_vm_node.log)
2026-04-16 20:31:13 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...

Expected Behavior
Cowork tab should appear next to Chat and Code tabs.

What Should Happen?

The Cowork tab should appear in the Claude Desktop app
alongside the "Chat" and "Code" tabs, allowing the user
to access and use Cowork features.

This is confirmed working on another desktop PC
using the same account, so the issue is specific
to this Windows 11 Home environment.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop (latest version) on Windows 11 Home (Build 26200.8037)
2. Log in with a paid Pro account
3. Launch Claude Desktop
4. Observe: Only "Chat" and "Code" tabs are visible — no "Cowork" tab

Additional steps already attempted to fix the issue:

1. Manually installed Hyper-V via .bat script (Windows 11 Home does not include Hyper-V by default)
2. Enabled "Virtual Machine Platform" in Windows Features
3. Enabled "Windows Hypervisor Platform" in Windows Features
4. Verified AMD-V virtualization is set to "Enabled" in BIOS
5. Fully uninstalled Claude Desktop
6. Deleted %APPDATA%\Claude and %LOCALAPPDATA%\Claude folders
7. Reinstalled latest Claude Desktop from claude.ai/download
8. Rebooted multiple times after each step

Result: Cowork tab still does not appear.

Note: Cowork tab works correctly on a separate desktop PC
using the same account (Windows 11 Pro).

Log file (%APPDATA%\Claude\logs\cowork_vm_node.log):
2026-04-16 20:31:13 [info] [cleanupVMBundleIfUnsupported]
yukonSilver not supported (status=unsupported), checking for stale bundle...

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

버전 1.2773.0 (884b37)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Windows Terminal

Additional Information

<img width="124" height="64" alt="Image" src="https://github.com/user-attachments/assets/cda694f6-39cc-474f-bd62-494428e0e7d9" />