[BUG] Cowork PuTTY "unknown option -G" error on Windows

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 shows PuTTY Command Line Error "unknown option -G"
on Windows. Also shows "validation_failed" error.
Virtual Machine Platform is enabled. Restarting does not fix it.
OS: Windows 10/11

What Should Happen?

Cowork should open normally without PuTTY errors

Error Messages/Logs

PuTTY Command Line Error: unknown option '-G'
validation_failed

Steps to Reproduce

1. Install Claude Desktop on Windows
2. Enable Virtual Machine Platform in Windows Features
3. Enable virtualization in BIOS
4. Open Claude Desktop and go to Cowork tab
5. PuTTY error "unknown option -G" appears immediately
6. Also shows "validation_failed" error

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Desktop (latest)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_