Resolved after 4 days 3 hours, affecting Claude Cowork, on September 10, 2026.
This issue has been resolved. Microsoft has released a September 14 Windows update that fixes it: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update
Other major vendors with incidents that started within 30 minutes of this one
Affected components
Update timeline
- identified Sep 10, 2026, 03:54 PM UTC
A Windows update released September 8 has caused Claude Cowork on Windows is unable to run local commands on your PC, because its workspace can no longer reach your computer’s drive. For most users, chat and reading or editing files still work. We have identified the cause as a change in Windows; Microsoft has developed a fix and is working on releasing it. There’s no in-app workaround yet, and restarting or reinstalling won’t help. We’ll post an update when we have more to share.
- resolved Sep 14, 2026, 07:14 PM UTC
This issue has been resolved. Microsoft has released a September 14 Windows update that fixes it: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update
Your product runs on more than Anthropic
Add the vendors you depend on and get one message when any of them reports trouble. Free for 3 vendors, no card.
Amazon Web Services