[BUG] [Windows] Extension fails to activate - hardcoded Linux path causes TypeError

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?

Environment:

• OS: Windows 11
• VS Code Version: (your version)
• Claude Code Extension Version: 2.1.51
• Claude CLI Version: 2.1.51

Problem:
The Claude Code VS Code extension fails to activate on Windows.
All commands (claude-vscode.terminal.open, claude-vscode.sidebar.open, etc.)
are not found because the extension never activates.

Error from Extension Host Log:
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'
at Module.createRequire (node:internal/modules/cjs/loader:1915:13)
at Object.<anonymous>
(c:\Users\..\.vscode\extensions\anthropic.claude-code-2.1.51-win32-x64\extension.js:45:4602)

Root Cause:
The extension contains a hardcoded Linux path
(/home/runner/work/...) inside the Windows build (win32-x64).
This causes activation to fail completely on Windows.

Impact:

• Sidebar does not open
• Terminal command not found
• No Claude commands available in Command Palette
• CLI works fine (claude --version shows 2.1.51)

Steps to Reproduce:

1. Install anthropic.claude-code on Windows
2. Open VS Code
3. Try Ctrl+Shift+P → "Claude: Open in Terminal"
4. Error: command 'claude-vscode.terminal.open' not found

What Should Happen?

The Claude Code VS Code extension should activate successfully on Windows
and register all commands properly, including:

• claude-vscode.terminal.open
• claude-vscode.sidebar.open
• claude-vscode.editor.openLast

The extension should use platform-independent or Windows-compatible
paths instead of hardcoded Linux paths
(/home/runner/work/...) in the Windows (win32-x64) build.

After activation, the Claude sidebar should open in VS Code and
all commands should be available in the Command Palette (Ctrl+Shift+P).

Error Messages/Logs

Extension Host Log:

2026-02-24 11:44:18.806 [info] ExtensionService#_doActivateExtension 
Anthropic.claude-code, startup: false, activationEvent: 'onStartupFinished'

2026-02-24 11:44:18.879 [error] Activating extension Anthropic.claude-code 
failed due to an error:

2026-02-24 11:44:18.880 [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'
    at Module.createRequire (node:internal/modules/cjs/loader:1915:13)
    at Object.<anonymous> (c:\Users\Foysol\.vscode\extensions\
anthropic.claude-code-2.1.51-win32-x64\extension.js:45:4602)
    at Module._compile (node:internal/modules/cjs/loader:1714:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1848:10)
    at Module.load (node:internal/modules/cjs/loader:1448:32)
    at Module._load (node:internal/modules/cjs/loader:1270:12)
    at Module.c._load (node:electron/js2c/node_init:2:17993)

VS Code Command Palette Error:
"Command 'Claude Code: Open in Terminal' resulted in an error"
"command 'claude-vscode.terminal.open' not found"

"Command 'Claude Code: Open in Side Bar' resulted in an error"  
"command 'claude-vscode.sidebar.open' not found"

"Command 'Claude Code: Open Last' resulted in an error"
"command 'claude-vscode.editor.openLast' not found"

Note: Claude CLI works fine in terminal (claude --version = 2.1.51)
The issue is only with the VS Code extension activation on Windows.

Steps to Reproduce

1. Install Claude Code CLI on Windows:

Run: irm https://claude.ai/install.ps1 | iex
Result: Claude Code v2.1.51 installed successfully

1. Add CLI to Windows PATH:

C:\Users\Foysol\.local\bin

1. Verify CLI works:

Run: claude --version
Result: 2.1.51 (Claude Code) ✓

1. Install VS Code extension:

Run: code --install-extension anthropic.claude-code
Result: Extension 'anthropic.claude-code' v2.1.51 successfully installed ✓

1. Fully close and reopen VS Code

1. Open Command Palette (Ctrl+Shift+P)

1. Search and run: "Claude Code: Open in Terminal"

Result: Error - command 'claude-vscode.terminal.open' not found ✗

1. Search and run: "Claude Code: Open in Side Bar"

Result: Error - command 'claude-vscode.sidebar.open' not found ✗

1. Check Extension Host Log (Developer: Show Logs → Extension Host)

Result: TypeError with hardcoded Linux path found ✗

Tried uninstalling and reinstalling extension multiple times.
Same error persists every time.

OS: Windows 11
VS Code: latest
Extension: anthropic.claude-code v2.1.51 (win32-x64)

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code v2.1.51

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_