[BUG] Claude Desktop MSIX on Windows: App crashes on restart, requires reinstall every reboot (Korean username path)

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?

What's Wrong?

Claude Desktop (MSIX, v1.1.6041) crashes on every restart/reboot on Windows.
The app window appears briefly then closes, leaving only background processes in Task Manager.
Cowork shows "requires reinstall" banner after each reboot.

The only fix is to fully remove the MSIX package and reinstall from:
https://claude.ai/api/desktop/win32/x64/msix/latest/redirect

This happens EVERY time the app or PC restarts.

Suspected Root Cause

Windows username contains Korean characters (김형중).
The cowork_vm_node.log shows corrupted path encoding:
C:\Users\源?뺤쨷\AppData\Roaming\Claude\
(Should be: C:\Users\김형중\...)

The CoworkVMService and MSIX sandbox appear to fail when
the user profile path contains non-ASCII (Korean) characters.

Environment

• Claude Desktop version: 1.1.6041.0 (MSIX)
• Windows: Windows 11 Pro 25H2 (Build 26200)
• Windows username: 김형중 (Korean characters)
• Hyper-V: Enabled
• HypervisorPlatform: Enabled
• VirtualMachinePlatform: Enabled
• SignatureKind: Developer

Steps to Reproduce

1. Install Claude Desktop MSIX on Windows with Korean username
2. Launch app → works fine
3. Close app or reboot PC
4. Relaunch → app window flashes and closes
5. Task Manager shows Claude processes in background
6. Cowork tab shows "requires reinstall" banner
7. Only fix: Remove-AppxPackage → reinstall MSIX

Expected Behavior

App should launch normally after restart without requiring reinstall.

Logs

cowork_vm_node.log shows:
yukonSilver not supported (status=unsupported), checking for stale bundle...

main.log shows corrupted Korean path:
[LocalSessionManager] Session storage directory does not exist yet:
C:\Users\源?뺤쨷\AppData\Roaming\Claude\...

What Should Happen?

App should launch normally after restart without requiring reinstall.

Error Messages/Logs

cowork_vm_node.log shows:
yukonSilver not supported (status=unsupported), checking for stale bundle...

main.log shows corrupted Korean path:
[LocalSessionManager] Session storage directory does not exist yet:
C:\Users\源?뺤쨷\AppData\Roaming\Claude\...

Steps to Reproduce

What's Wrong?

Claude Desktop (MSIX, v1.1.6041) crashes on every restart/reboot on Windows.
The app window appears briefly then closes, leaving only background processes in Task Manager.
Cowork shows "requires reinstall" banner after each reboot.

The only fix is to fully remove the MSIX package and reinstall from:
https://claude.ai/api/desktop/win32/x64/msix/latest/redirect

This happens EVERY time the app or PC restarts.

Suspected Root Cause

Windows username contains Korean characters (김형중).
The cowork_vm_node.log shows corrupted path encoding:
C:\Users\源?뺤쨷\AppData\Roaming\Claude\
(Should be: C:\Users\김형중\...)

The CoworkVMService and MSIX sandbox appear to fail when
the user profile path contains non-ASCII (Korean) characters.

Environment

• Claude Desktop version: 1.1.6041.0 (MSIX)
• Windows: Windows 11 Pro 25H2 (Build 26200)
• Windows username: 김형중 (Korean characters)
• Hyper-V: Enabled
• HypervisorPlatform: Enabled
• VirtualMachinePlatform: Enabled
• SignatureKind: Developer

Steps to Reproduce

1. Install Claude Desktop MSIX on Windows with Korean username
2. Launch app → works fine
3. Close app or reboot PC
4. Relaunch → app window flashes and closes
5. Task Manager shows Claude processes in background
6. Cowork tab shows "requires reinstall" banner
7. Only fix: Remove-AppxPackage → reinstall MSIX

Expected Behavior

App should launch normally after restart without requiring reinstall.

Logs

cowork_vm_node.log shows:
yukonSilver not supported (status=unsupported), checking for stale bundle...

main.log shows corrupted Korean path:
[LocalSessionManager] Session storage directory does not exist yet:
C:\Users\源?뺤쨷\AppData\Roaming\Claude\...

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

1.1.2321

Claude Code Version

Claude Desktop version: 1.1.6041.0 (MSIX)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_