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claude-code - 💡(How to fix) Fix [BUG] Cowork tab not visible on Windows 11 Business — yukonSilver marked as unsupported despite virtualization fully enabled [1 comments, 2 participants]

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anthropics/claude-code#48995•Fetched 2026-04-17 08:53:44
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Puru1987Puru1987
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Error Message

Error Messages/Logs

Code Example

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
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • 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

extent analysis

TL;DR

The issue can likely be resolved by bypassing the yukonSilver pre-check or updating the virtualization detection mechanism in Claude Desktop to correctly identify supported VM configurations.

Guidance

  1. Investigate yukonSilver pre-check: Review the yukonSilver detection logic to understand why it incorrectly classifies the VM configuration as unsupported despite virtualization being enabled and the VM module loading successfully.
  2. Verify VM configuration: Double-check that the Virtual Machine Platform is enabled in Windows Features and virtualization is enabled in Task Manager to ensure the system meets the requirements for Cowork to appear.
  3. Check for updates: Although the user is on the latest version of Claude Desktop, monitor the issue tracker for any updates or patches related to the yukonSilver detection mechanism or VM support.
  4. Temporary workaround: Consider temporarily disabling the yukonSilver pre-check to see if Cowork initializes correctly, which could help confirm if the issue is indeed related to the pre-check.

Example

No code snippet is provided as the issue seems to be related to the internal detection mechanism of Claude Desktop rather than a code-level problem that can be directly addressed with a snippet.

Notes

The provided information suggests a regression since the functionality worked in a previous version, but the last working version is not specified. The fact that the VM module loads successfully but is blocked by the yukonSilver pre-check indicates a potential issue with the detection logic.

Recommendation

Apply a workaround by temporarily disabling the yukonSilver pre-check if possible, to verify if this resolves the issue, while awaiting a potential update to the detection mechanism.

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