VS Code extension fails to activate on Windows - hardcoded Linux path in extension bundle

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?

OS: Windows
Extension version: 2.1.51
Error:
TypeError: The argument 'filename' must be a file URL object, file URL string, or absolute path string.
Received 'file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs'

Extension fails to activate on Windows due to a hardcoded Linux path in extension.js.
Command 'claude-vscode.editor.openLast' not found as a result.

What Should Happen?

The Claude Code extension should activate successfully on Windows and the claude-vscode.editor.openLast command should be registered and functional after clicking the Claude icon in the VS Code sidebar.

Error Messages/Logs

Steps to Reproduce

1. Install VS Code on Windows (any recent version)
2. Install the Claude Code extension (v2.1.51) from the VS Code marketplace
3. Ensure Claude Code CLI is installed and working (claude --version returns 2.1.51)
4. Open any project folder in VS Code
5. Click the Claude icon in the VS Code sidebar (or run any claude-vscode command)

Result: Command 'claude-vscode.editor.openLast' not found error appears.

To confirm the root cause:

• Open VS Code logs via Help → Toggle Developer Tools → Console, or
• Command Palette → "Developer: Show Logs" → "Extension Host"
• You will see:

Activating extension Anthropic.claude-code failed due to an error:
TypeError: The argument 'filename' must be a file URL object, file URL string, or absolute path string. Received 'file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs'

Environment:

• OS: Windows 10/11
• VS Code version: (your version)
• Claude Code extension: 2.1.51
• Claude Code CLI: 2.1.51

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.51

Platform

Other

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_