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Claude Code Issues / #48995

[BUG] Cowork tab not visible on Windows 11 Business — yukonSilver marked as unsupported despite virtualization fully enabled

Resolved 💬 3 comments Opened Apr 16, 2026 by Puru1987 Closed Apr 19, 2026

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 tab is not showing in Claude Desktop on Windows 11 Business. Only Chat and Code tabs are visible. The system has virtualization fully enabled and confirmed working, but the app's internal detection (yukonSilver) incorrectly classifies the VM configuration as unsupported, preventing Cowork from appearing.
The logs show the VM module actually loads successfully, yet the yukonSilver pre-check blocks Cowork from initializing.

What Should Happen?

<head></head><p class="font-claude-response-body break-words whitespace-normal leading-[1.7]" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;">Cowork tab is not showing in Claude Desktop on Windows 11 Business. Only<span class="Apple-converted-space"> </span><strong>Chat</strong><span class="Apple-converted-space"> </span>and<span class="Apple-converted-space"> </span><strong>Code</strong><span class="Apple-converted-space"> </span>tabs are visible. The system has virtualization fully enabled and confirmed working, but the app's internal detection (<code class="bg-text-200/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]">yukonSilver</code>) incorrectly classifies the VM configuration as unsupported, preventing Cowork from appearing.</p><p class="font-claude-response-body break-words whitespace-normal leading-[1.7]" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;">The logs show the VM module actually<span class="Apple-converted-space"> </span><strong>loads successfully</strong>, yet the yukonSilver pre-check blocks Cowork from initializing.</p><h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;">Environment</h2><div class="overflow-x-auto w-full px-2 mb-6" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;">
Detail | Value
-- | --
OS | Windows 11 Business
Claude Desktop | Latest version (downloaded from claude.ai)
Subscription | [Your plan: Pro / Max / Team / Enterprise]
Installation method | Installed with Administrator privileges
User account | Running under normal (non-admin) user

</div>

Error Messages/Logs

2026-04-16 13:29:24 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-04-16 13:30:16 [info] [VM] Loading vmClient (TypeScript) module...
2026-04-16 13:30:16 [info] [VM] Module loaded successfully

Steps to Reproduce

Install Claude Desktop (latest version from claude.ai/download) with Administrator privileges on Windows 11 Business
Ensure Virtual Machine Platform is enabled in Windows Features
Confirm virtualization is enabled in Task Manager → Performance → CPU
Confirm CoworkVMService is running (Get-Service CoworkVMService in PowerShell)
Open Claude Desktop with a normal (non-admin) user account
Observe: Only Chat and Code tabs are visible — Cowork tab is missing
Check logs — yukonSilver is marked as unsupported

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.2773.0 (884b37) 2026-04-15T14:32:09.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Verified virtualization is enabled in Task Manager
Confirmed CoworkVMService is running
Installed Claude Desktop with Administrator privileges
Restarted computer after installation
Enabled Virtual Machine Platform in Windows Features

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