[BUG] Cowork rejects project folders outside user home directory (non-C: drives)

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?

Description
Claude Cowork (web UI) no longer accepts project folders located outside the user's home directory. Paths on other drives (e.g. D:\) are rejected with the error:

"The folder must be inside your home directory"

This worked without issues as recently as yesterday (2026-02-15).

Steps to Reproduce
Open Claude Cowork in the browser
Try to set a project folder on a non-C: drive, e.g. D:\Claude Arbeitsbereich
Error appears: folder must be inside home directory
Expected Behavior
Non-C: drive paths should be accepted as project folders, as they were before.

Workarounds Attempted
Symlink from C:\Users\<user>\ pointing to D:\ folder → same error (Cowork resolves the real path)
Junction point → same result
Environment
OS: Windows 11 Pro
Date last working: 2026-02-15
Date broken: 2026-02-16
Impact
Many Windows users store projects on secondary drives. This change effectively locks out all non-home-directory workflows without prior notice.

What Should Happen?

Cloud should accept the selected ordner on any harddisk

Error Messages/Logs

Steps to Reproduce

<img width="536" height="400" alt="Image" src="https://github.com/user-attachments/assets/fb46f305-cc8c-4834-aa01-346a94c5debc" />

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Version 1.1.3189 (1b7b58)

Claude Code Version

Version 1.1.3189 (1b7b58)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Non-interactive/CI environment

Additional Information

_No response_