[BUG] Claude Desktop - Co-Work not functioning

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?

Please refer to issue #25136 and #28238 as prior reports of the same pattern — yours is apparently still reproducible on the latest build.
Edition Windows 11 Pro
Version 25H2
Installed on ‎4/‎16/‎2026
OS build 26200.8328
Serial number PF5FP2VM
Experience Windows Feature Experience Pack 1000.26100.304.0

Claude for Windows
Claude 1.6608.2 (ebf1a1) 2026-05-08T23:17:27.000Z

2026-05-12 10:59:08 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...

Same error before and after a clean install

What Should Happen?

A new executable that enables Claude Co-work to run.

Error Messages/Logs

2026-05-12 10:59:08 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...

Steps to Reproduce

1. Open Claude Desktop
2. Navigate to Claude Co-Work
3. Error Message pops up - Cowork requires a newer installation

Reinstall the desktop app to access Cowork and start handing off longer tasks.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.6608.2 (ebf1a1) 2026-05-08T23:17:27.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_