### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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? What's Wrong? <p class="font-claude-response-body bre

[BUG] Cowork tab missing on Windows 11 Pro — Intel Core Ultra 7 265 (Arrow Lake) not recognized by yukonSilver

Resolved 💬 3 comments Opened Apr 18, 2026 by madacifr Closed Apr 22, 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?

<html><body>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">What's Wrong?</h2>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">The Cowork tab does not appear in Claude Desktop on Windows 11 Pro with an <strong>Intel Core Ultra 7 265 (Arrow Lake, 2024)</strong> processor. Only "Chat" and "Code" tabs are visible.</p>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">The same Claude Desktop version, same Windows 11 Pro, same Max plan works correctly on an <strong>Intel i7-13700 (Raptor Lake, 2022)</strong> machine — confirming this is a CPU architecture detection issue, not a configuration problem.</p>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Environment</h2>
<div class="overflow-x-auto w-full px-2 mb-6">
Component | Details
-- | --
OS | Windows 11 Pro x64
CPU | Intel Core Ultra 7 265 (Arrow Lake, Q4 2024)
Claude Desktop | Latest version (installed via EXE, not MSIX)
Claude Plan | Max
HyperVisorPresent | ✅ True
Hyper-V | ✅ Enabled
Virtual Machine Platform | ✅ Enabled
Windows Hypervisor Platform | ✅ Enabled

</div>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Log Evidence</h2>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]"><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]">%APPDATA%\Claude\logs\cowork_vm_node.log</code> on the Arrow Lake machine:</p>
<div role="group" aria-label="Code" tabindex="0" class="relative group/copy bg-bg-000/50 border-0.5 border-border-400 rounded-lg focus:outline-none focus-visible:ring-2 focus-visible:ring-accent-100"><div class="sticky opacity-0 group-hover/copy:opacity-100 group-focus-within/copy:opacity-100 top-2 py-2 h-12 w-0 float-right"><div class="absolute right-0 h-8 px-2 items-center inline-flex z-10"><button class="inline-flex
items-center
justify-center
relative
isolate
shrink-0
can-focus
select-none
disabled:pointer-events-none
disabled:opacity-50
disabled:shadow-none
disabled:drop-shadow-none border-transparent
transition
font-base
duration-300
ease-[cubic-bezier(0.165,0.85,0.45,1)] h-8 w-8 rounded-md backdrop-blur-md _fill_10ocf_9 _ghost_10ocf_96" type="button" aria-label="Copier dans le presse-papiers" data-state="closed"><div class="relative"><div class="transition-all opacity-100 scale-100" style="width: 20px; height: 20px; display: flex; align-items: center; justify-content: center;"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" style="flex-shrink: 0;" class="transition-all opacity-100 scale-100" aria-hidden="true"><path d="M12.5 3A1.5 1.5 0 0 1 14 4.5V6h1.5A1.5 1.5 0 0 1 17 7.5v8a1.5 1.5 0 0 1-1.5 1.5h-8A1.5 1.5 0 0 1 6 15.5V14H4.5A1.5 1.5 0 0 1 3 12.5v-8A1.5 1.5 0 0 1 4.5 3zm1.5 9.5a1.5 1.5 0 0 1-1.5 1.5H7v1.5a.5.5 0 0 0 .5.5h8a.5.5 0 0 0 .5-.5v-8a.5.5 0 0 0-.5-.5H14zM4.5 4a.5.5 0 0 0-.5.5v8a.5.5 0 0 0 .5.5h8a.5.5 0 0 0 .5-.5v-8a.5.5 0 0 0-.5-.5z"></path></svg></div><div class="absolute inset-0 flex items-center justify-center"><div class="transition-all opacity-0 scale-50" style="width: 20px; height: 20px; display: flex; align-items: center; justify-content: center;"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" style="flex-shrink: 0;" class="transition-all opacity-0 scale-50" aria-hidden="true"><path d="M15.188 5.11a.5.5 0 0 1 .752.626l-.056.084-7.5 9a.5.5 0 0 1-.738.033l-3.5-3.5-.064-.078a.501.501 0 0 1 .693-.693l.078.064 3.113 3.113 7.15-8.58z"></path></svg></div></div></div></button></div></div><div class="overflow-x-auto"><pre class="code-block__code !my-0 !rounded-lg !text-sm !leading-relaxed p-3.5" style="color: rgb(20, 24, 31); background: transparent; font-family: var(--font-mono);"><code style="color: rgb(20, 24, 31); background: transparent; font-family: var(--font-mono); white-space: pre-wrap;"><span><span>[info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...</span></span></code></pre></div></div>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">This error repeats every few minutes. The VM bundle is never downloaded and the Cowork tab never appears.</p>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Root Cause</h2>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">The <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> VM platform detection logic does not recognize <strong>Intel Arrow Lake</strong> (Core Ultra 200 series, released Q4 2024) as a supported architecture. This is a false negative — the hardware fully supports virtualization (HyperVisorPresent = True).</p>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Steps to Reproduce</h2>
<ol class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3">
<li class="whitespace-normal break-words pl-2">Install Claude Desktop (latest) on Windows 11 Pro with Intel Core Ultra 7 265</li>
<li class="whitespace-normal break-words pl-2">Enable all virtualization features (Hyper-V, VMP, WHP)</li>
<li class="whitespace-normal break-words pl-2">Sign in with a Max plan account</li>
<li class="whitespace-normal break-words pl-2">Observe: only "Chat" and "Code" tabs visible — no "Cowork" tab</li>
<li class="whitespace-normal break-words pl-2">Check <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]">%APPDATA%\Claude\logs\cowork_vm_node.log</code> → <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 not supported</code></li>
</ol>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Expected Behavior</h2>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">Cowork tab should appear and function on Intel Core Ultra 7 265 (Arrow Lake) with all virtualization features enabled.</p>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Suggested Fix</h2>
<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">Update <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> platform detection logic to explicitly support Intel Arrow Lake (Core Ultra 200 series). These CPUs were released Q4 2024 and are increasingly common in new Windows machines.</p>
<h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold">Related Issues</h2>
<ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3">
<li class="whitespace-normal break-words pl-2">#25136 (Windows 11 Pro x64 — yukonSilver unsupported)</li>
<li class="whitespace-normal break-words pl-2">#25692 (Windows — Cowork tab not appearing)</li>
<li class="whitespace-normal break-words pl-2">#26090 (Windows 10 Home — Hyper-V not available)</li></ul>
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What Should Happen?

Error Messages/Logs

Steps to Reproduce

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.3109.0 (35cbf6) 2026-04-16T20:32:01.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_

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