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Claude Code Issues / #34579

[BUG] Cowork crashes immediately after splash screen on Windows 11 25H2 (Build 26200) — white screen then exit

Resolved 💬 3 comments Opened Mar 15, 2026 by son-seokho8050 Closed Apr 12, 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 crashes immediately after splash screen. White screen for 1-2 seconds then exits. 100% reproducible. Never successfully launched. Reinstalled ~20 times. Related to #31432 — same Windows 25H2 Build 26200.

What Should Happen?

Cowork should launch normally after splash screen.

Error Messages/Logs

Crashpad dump shows:
LocaleDataPakExists-not_found_path: C:\Program Files\WindowsApps\Claude_1.1.6679.0_x64__pzs8sxrjxfjjc\app\locales\ko-KR.pak
Error: %s. Aborting.

Steps to Reproduce

  1. Install Claude Desktop v1.1.6679 via MSIX on Windows 11 Home 25H2 (Build 26200.8037)
  2. Launch Cowork
  3. Splash appears → white screen → app exits

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1.6679

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

<html>
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<!--StartFragment--><html><head></head><body><h1>[BUG] Cowork crashes immediately after splash screen on Windows 11 25H2 (Build 26200) — white screen then exit</h1>
<h2>Preflight Checklist</h2>
<ul>
<li>[x] I have searched existing issues and this hasn't been reported yet</li>
<li>[x] This is a single bug report (please file separate reports for different bugs)</li>
<li>[x] I am using the latest version of Claude Code</li>
</ul>
<h2>What's Wrong?</h2>
<p>Cowork crashes immediately after the splash/logo screen. The app shows a white screen for 1-2 seconds, then exits. This is <strong>100% reproducible</strong> — the app has never successfully launched on this machine.</p>
<h3>Related issue: #31432</h3>
<p>Same Windows version (25H2, Build 26200), same MSIX install type. #31432 reports VM crash after 3-4 minutes; my case is worse — the app never reaches a usable state.</p>
<h2>Environment</h2>
<ul>
<li><strong>App version:</strong> 1.1.6679</li>
<li><strong>Electron version:</strong> 40.4.1</li>
<li><strong>Platform:</strong> Windows 11 Home 25H2 (Build 26200.8037)</li>
<li><strong>RAM:</strong> 32 GB</li>
<li><strong>Install type:</strong> MSIX (Store path: <code>Claude_pzs8sxrjxfjjc</code>)</li>
<li><strong>Locale:</strong> ko-KR</li>
</ul>
<h2>Crashpad dump analysis</h2>
<p>A 35MB crash dump was generated at:
<code>AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\Crashpad\reports\</code></p>
<p>Text extraction from the binary dump reveals:</p>
<pre><code>LocaleDataPakExists-found_path: C:\Program Files\WindowsApps\Claude_1.1.6679.0_x64__pzs8sxrjxfjjc\app\locales\ko.pak
LocaleDataPakExists-not_found_error: 2
LocaleDataPakExists-not_found_path: C:\Program Files\WindowsApps\Claude_1.1.6679.0_x64__pzs8sxrjxfjjc\app\locales\ko-KR.pak
</code></pre>
<p>And ends with:</p>
<pre><code>Error: %s. Aborting.
</code></pre>
<p>The app looks for <code>ko-KR.pak</code> but only <code>ko.pak</code> exists in the locales directory. Manually copying <code>ko.pak</code> to <code>ko-KR.pak</code> did not resolve the crash. Changing locale to <code>en-US</code> in config also did not help.</p>
<h2>What I've tried (all failed)</h2>

Attempt | Result
-- | --
Reinstall app (~20 times) | Same crash
Delete cache folders (Cache, GPUCache, Code Cache, Session Storage, blob_storage, Crashpad, DawnGraphiteCache, DawnWebGPUCache) | Same crash
Launch with --disable-gpu | Same crash
Launch with --disable-gpu --disable-software-rasterizer | Same crash
Launch with --disable-gpu --use-gl=swiftshader | Same crash
Stop CoworkVMService before launch | Same crash
Copy ko.pak → ko-KR.pak to fix missing locale file | Same crash
Change locale from ko-KR to en-US in config | Same crash
Windows App Settings → Repair | "Cannot repair this app"
McAfee antivirus | Expired/inactive — not the cause

<h2>CoworkVMService status</h2>
<pre><code>SERVICE_NAME: CoworkVMService
Type: WIN32_PACKAGED_PROCESS
State: RUNNING
</code></pre>
<pre><code>hypervisorlaunchtype Auto
</code></pre>
<h2>What Should Happen?</h2>
<p>Cowork should launch and display the main interface after the splash screen, not crash with a white screen.</p>
<h2>Steps to Reproduce</h2>
<ol>
<li>Install Claude Desktop v1.1.6679 via MSIX on Windows 11 Home 25H2 (Build 26200.8037)</li>
<li>Launch Claude Desktop</li>
<li>Splash/logo appears → white screen → app exits immediately</li>
</ol>
<h2>Claude Model</h2>
<p>Opus 4.6</p>
<h2>Is this a regression?</h2>
<p>Not sure — Cowork has never worked on this machine.</p>
<h2>Platform</h2>
<p>Windows</p>
<h2>Operating System</h2>
<p>Windows 11 Home 25H2 (Build 26200.8037)</p>
<h2>Additional Information</h2>
<p>Crash dump file (35MB .dmp) is available upon request. The dump contains the <code>ko-KR.pak</code> not_found_error and <code>Error: %s. Aborting.</code> traces described above.</p></body></html><!--EndFragment-->
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