[BUG] Claude Desktop 1.1.4173 — window fails to open due to unhandled @formatjs/intl error

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?

When trying to launch the latest version of the Claude Desktop app for Windows, the Claude background processes start, but the UI window never launches.

The app initializes (MCP servers, Chrome extension, growthbook, etc.) but theBrowserWindow is never created/shown.

What Should Happen?

Claude client UX should appear

Error Messages/Logs

## Root cause
  An unhandled promise rejection from @formatjs/intl crashes the renderer during
  window creation:

  Error: [@formatjs/intl] An id must be provided to format a message.
      at nZe (index.js:83:2748)
      at Sae (index.js:83:4203)
      at WOt (index.js:705:12468)
      at RDe (index.js:705:14365)
      at Hd (index.js:705:15535)
      at EventEmitter. (index.js:1234:79020)

Steps to Reproduce

Click on Claude icon on taskbar.
Watch Windows Task manager to see that Claude processes all spin up, but no UX window appears

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Claude 1.1.4010 (da63f3) 2026-02-22T18:53:52.000Z

Claude Code Version

Claude Desktop 1.1.4173

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_