Windows Update breaks local command execution; Microsoft fix pending
Degraded functionality for Claude Cowork on Windows
Original: Degraded functionality for Claude Cowork on Windows
Importance: Windows版の主要機能が利用不可、既存ユーザーの運用に直接影響する障害
Summary
A Windows update released on September 8 has caused Claude Cowork on Windows to lose access to local drives, preventing local command execution. Chat and file operations remain functional for most users. Anthropic has identified the cause as a Windows-side change; Microsoft is developing a fix. Restart or reinstallation will not help.
Key Points
- Windows Update (Sep 8) breaks Claude Cowork local command execution on Windows
- File operations and chat remain functional for most users
- Microsoft developing fix; Anthropic awaiting release
- Restart or reinstall will not resolve the issue
View developer notes (APIs, breaking changes, migration)
Claude Cowork Windows build experiencing filesystem access degradation; workspace sandbox cannot resolve paths to host machine drives, breaking local command execution API. No client-side workaround available per Anthropic status. Awaiting Microsoft OS-level permissions or mount point control fix. Regression-type incident; track via status page for resolution timeline.
Source: https://status.claude.com/incidents/r1pqn1kb4hvk
Outlet: Anthropic Status
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