[BUG] Cannot connect to JetBrains Rider 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?

When opening a C#/Unity project from Unity editor, project root will be registered differently from the IDE side:

<img width="1098" height="314" alt="Image" src="https://github.com/user-attachments/assets/937035f8-d1eb-4a10-a8f4-caab1aeb39dc" />

In this case the root should be "D:\git\HMD-Air", not /mnt/d/git/HMD-Air .

This idiosyncracy may be caused by vsproj build system never had a single project root, some internal mapping was used to circumvent the build in limitations of most JetBrains IDEs. I only knew this because amp-code plugin used to have the same problem

What Should Happen?

should connect to IDE plugin successfully

Error Messages/Logs

`
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                                                      │
│  Select IDE                                                                                                          │
│  Connect to an IDE for integrated development features.                                                              │
│                                                                                                                      │
│  No available IDEs detected. Make sure your IDE has the Claude Code extension or plugin installed and is running.    │
│                                                                                                                      │
│  Found 1 other running IDE(s). However, their workspace/project directories do not match the current cwd.            │
│                                                                                                                      │
│     • JetBrains Rider: /mnt/d/git/HMD-Air                                                                            │
│                                                                                                                      │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
 Esc to exit

Steps to Reproduce

Just open any project with Rider and you will see

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.0.42

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_