[BUG] Claude Desktop fails to launch on Windows 10 — EBADF renameSync error on git-worktrees.json

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?

Environment

<img width="1568" height="533" alt="Image" src="https://github.com/user-attachments/assets/4f1c731e-8cfd-4153-b78c-1f509a11bacd" />
<img width="1568" height="505" alt="Image" src="https://github.com/user-attachments/assets/60cba3a9-f6f3-4fab-8daf-788ac07fa05a" />
<img width="1568" height="570" alt="Image" src="https://github.com/user-attachments/assets/8661428a-0758-420f-99a5-3cab9ff9dc73" />
<img width="1568" height="274" alt="Image" src="https://github.com/user-attachments/assets/b99d4973-0fc8-4ba9-997b-eb54e504d3b3" />
<img width="1387" height="868" alt="Image" src="https://github.com/user-attachments/assets/ac702601-ec2b-4a17-a4f0-3e70f47ab2e0" />
<img width="1098" height="635" alt="Image" src="https://github.com/user-attachments/assets/a1a0c7e7-2435-499c-93e2-99804d9d26b8" />
<img width="1105" height="440" alt="Image" src="https://github.com/user-attachments/assets/ceae1f33-e299-4f9f-a326-7312d8908d5d" />
<img width="695" height="213" alt="Image" src="https://github.com/user-attachments/assets/4f55c708-baf4-4b33-9fb3-23bd0c3212b7" />

• OS: Windows 10 Pro 64-bit, Build 19045.6466
• CPU: Intel Core i5-7200U @ 2.50GHz
• RAM: 8GB
• Claude Desktop version: Unknown (app crashes before UI appears)
• Installation method: MSIX (via ClaudeSetup.exe from claude.ai/download)

What's Wrong?
Claude Desktop crashes immediately on every launch. No window appears.
The error dialog shows: "Claude Desktop failed to launch. Please check for updates and try again."

Steps to Reproduce

1. Install Claude Desktop via ClaudeSetup.exe
2. Launch Claude Desktop
3. Error dialog appears immediately, no UI shown

Error Log
Found at: C:\Users\DELL\AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\logs\launch-failure.err

What Should Happen?

Claude Desktop should launch normally and display the main chat window.

Error Messages/Logs

Error: EBADF: bad file descriptor, rename
'~\AppData\Roaming\Claude\git-worktrees.json.tmp-6584506452127bdd'
-> '~\AppData\Roaming\Claude\git-worktrees.json'
errno: -4083, code: 'EBADF', syscall: 'rename'

Steps to Reproduce

Attempted Fixes (all failed)

• Multiple uninstall/reinstall cycles
• Cleared all residual files and MSIX packages via PowerShell
• Installed Windows App Runtime 1.6
• Enabled Hyper-V via PowerShell
• Pre-created git-worktrees.json with content [] at both AppData paths
• Ran installer as Administrator
• Deleted CoworkVMService registry entries

Additional Notes

• Event Viewer shows no Claude entries (crashes before writing logs)
• Cannot access Help → About (no UI appears)
• main.log is 0 bytes
• This appears identical to issue #40311

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Never worked — this is a fresh installation on Windows 10

Claude Code Version

N/A — this is a Claude Desktop issue, not Claude Code

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

This issue is identical to #40311.
The app crashes before any UI appears.
main.log is 0 bytes.
Event Viewer shows no Claude entries.
Please see attached screenshots.