[BUG] Cowork ENOSPC / EXDEV on Windows MSIX install — VM bundle fails to download

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?

Cowork fails to start with two sequential errors:

1. Initial error (low disk space):

ENOSPC: no space left on device, write

1. After freeing ~15 GB of disk space, the error changed to:

EXDEV: cross-device link not permitted, rename
'C:\temp\wvm-wG5Fkr\rootfs.vhdx' ->
'C:\Users\<user>\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\rootfs.vhdx'

What Should Happen?

VM bundle should download and install successfully.

Error Messages/Logs

Steps to Reproduce

Environment

• Claude Desktop version: 1.1.6041 (62e193) 2026-03-10T20:11:22.000Z
• OS: Windows (MSIX install)
• Hyper-V: Enabled, vmms service Running

What's wrong?
Cowork fails to start with two sequential errors:

1. Initial error (low disk space):

ENOSPC: no space left on device, write

1. After freeing ~15 GB of disk space, the error changed to:

EXDEV: cross-device link not permitted, rename
'C:\temp\wvm-wG5Fkr\rootfs.vhdx' ->
'C:\Users\<user>\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\rootfs.vhdx'

Root cause
The MSIX sandbox virtualizes AppData\Roaming as a separate filesystem.
Claude downloads rootfs.vhdx to C:\temp, then attempts fs.rename()
to move it to the virtualized AppData\Roaming path. Windows treats
these as different filesystems and blocks the rename with EXDEV —
even though both paths resolve to C:\ on the host.

Attempted workarounds

• Restarting Claude and computer — no effect
• Reinstall workspace button — no effect
• NTFS junction from AppData\Roaming\Claude\vm_bundles -> C:\ClaudeVM — no effect
• NTFS junction from MSIX RoamingState\vm_bundles -> C:\ClaudeVM — no effect
• Setting TEMP/TMP env variables to C:\temp — no effect

Expected behavior
VM bundle should download and install successfully.

Suggested fix
Replace fs.rename() with fs.copyFile() + fs.unlink()
(or use a cross-device aware move library) when moving
the downloaded VM bundle into the target directory.

Related issues
#25476, #28998, #30584

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1.6041 (Claude Desktop)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_