[BUG] [BUG] Claude Desktop fails to open on Windows 10 — EBUSY on chrome-native-host.exe

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?

Claude Desktop fails to open on Windows 10 — EBUSY on chrome-native-host.exe

Environment

• OS: Windows 10 Pro 10.0.19045
• Claude Desktop version: 1.1617.0 (installed via Microsoft Store)
• Plan: Pro

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Description

The Claude Desktop app fails to open completely — no window appears at all. The issue started on April 9th and persists after updating to version 1.1617.0 on April 10th.

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Steps already attempted

1. Killed all Claude and Claude Code processes via PowerShell (64 processes terminated)
2. Attempted to end tasks via Task Manager — access denied on all Claude processes
3. Uninstalled and reinstalled via Microsoft Store

None of the above resolved the issue.

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Key errors from logs

main.log — April 9, 14:02:59

[Chrome Extension MCP] Failed to copy native host binary:
Error: EBUSY: resource busy or locked,
copyfile 'C:\Program Files\WindowsApps\Claude_1.1062.0.0_x64__pzs8sxrjxfjjc\app\resources\chrome-native-host.exe'
-> 'C:\Users\jigna\AppData\Roaming\Claude\ChromeNativeHost\chrome-native-host.exe'

main.log — April 10, 12:16:07 (reproduced with new version 1.1617.0)

[Chrome Extension MCP] Failed to copy native host binary:
Error: EBUSY: resource busy or locked,
copyfile 'C:\Program Files\WindowsApps\Claude_1.1617.0.0_x64__pzs8sxrjxfjjc\app\resources\chrome-native-host.exe'
-> 'C:\Users\jigna\AppData\Roaming\Claude\ChromeNativeHost\chrome-native-host.exe'

main.log — April 9, 18:41:20

[sessions-bridge] Poll error: Failed with status 500: Internal server error
[request-id: req_011CZtXgxvqQu8eze3nHzBTk]

claude.ai-web.log — April 10, 12:16:08

Uncaught (in promise) Error: Error invoking remote method '..._BuddyBleTransport_$_reportState':
Error: No handler registered for '..._BuddyBleTransport_$_reportState'

cowork-service.log — Recurring (April 9, 10, 11, 12, 14)

Warning: failed to open service for recovery config: Acceso denegado.

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Analysis

The EBUSY error appears to be the root cause: something is locking chrome-native-host.exe preventing the app from completing its startup sequence. This persists across versions and reinstalls, suggesting the lock may survive uninstallation or originate outside the app's own processes.

The recurring Acceso denegado in cowork-service.log may also indicate insufficient permissions for the service.

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Expected behavior

App opens normally.

Actual behavior

No window appears. App silently fails to start.

What Should Happen?

Claude Desktop app opens normally and displays the main window.

Error Messages/Logs

[main.log - 2026-04-09 14:02:59]
[Chrome Extension MCP] Failed to copy native host binary:
Error: EBUSY: resource busy or locked,
copyfile 'C:\Program Files\WindowsApps\Claude_1.1062.0.0_x64__pzs8sxrjxfjjc\app\resources\chrome-native-host.exe'
-> 'C:\Users\jigna\AppData\Roaming\Claude\ChromeNativeHost\chrome-native-host.exe'

[main.log - 2026-04-10 12:16:07] (reproduced with version 1.1617.0)
Same EBUSY error with new version path.

[cowork-service.log - recurring]
Warning: failed to open service for recovery config: Acceso denegado.

Steps to Reproduce

1. Launch Claude Desktop app on Windows 10
2. No window appears — app silently fails to start
3. Check logs at %AppData%\Roaming\Claude\logs\main.log
4. EBUSY error on chrome-native-host.exe is present on every launch attempt

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

1.1062.0

Claude Code Version

2.1.107 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_