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claude-code - ๐Ÿ’ก(How to fix) Fix [BUG] Extension fails to activate on Windows โ€” hardcoded Linux path in extension.js (v2.1.136)

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Error Message

2026-05-09 00:46:07.828 [error] 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' at Object.<anonymous> (c:\Users\sshunko.vscode\extensions\anthropic.claude-code-2.1.136-win32-x64\extension.js:103:5579)

Fix Action

Fix / Workaround

Workaround: Rolling back to v2.1.0 resolves the issue.

Code Example

2026-05-09 00:46:07.828 [error] 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'
      at Object.<anonymous>
  (c:\Users\sshunko\.vscode\extensions\anthropic.claude-code-2.1.136-win32-x64\extension.js:103:5579)
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Description:

The Claude Code VS Code extension v2.1.136 fails to activate on Windows due to a hardcoded Linux build path embedded in extension.js.

Error from exthost.log: 2026-05-09 00:46:07.828 [error] 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' at Object.<anonymous> (c:\Users\sshunko.vscode\extensions
anthropic.claude-code-2.1.136-win32-x64\extension.js:103:5579)

Steps to reproduce:

  1. Install anthropic.claude-code v2.1.136 on Windows
  2. Open VS Code
  3. Click Claude icon in sidebar โ€” panel spins indefinitely and never loads

Expected behavior: Extension activates normally.

Actual behavior: Extension fails with TypeError โ€” the build artifact contains an absolute Linux path (/home/runner/work/...) instead of a relative or Windows-compatible path.

Environment:

  • OS: Windows 11 Pro 10.0.26200
  • VS Code extension: anthropic.claude-code v2.1.136 (win32-x64)
  • Claude CLI: v2.1.136

Workaround: Rolling back to v2.1.0 resolves the issue.

What Should Happen?

xtension activates successfully on Windows and the Claude panel loads without errors.

Error Messages/Logs

2026-05-09 00:46:07.828 [error] 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'
      at Object.<anonymous>
  (c:\Users\sshunko\.vscode\extensions\anthropic.claude-code-2.1.136-win32-x64\extension.js:103:5579)

Steps to Reproduce

  1. Install anthropic.claude-code v2.1.136 on Windows (win32-x64)
  2. Open VS Code
  3. Open Claude panel via sidebar icon
  4. Panel spins indefinitely and never loads

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.0

Claude Code Version

2.1.136 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

The extension.js bundle contains a hardcoded absolute Linux CI path (/home/runner/work/claude-cli-internal/...) which is invalid on Windows. Rolling back to v2.1.0 resolves the issue immediately.

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claude-code - ๐Ÿ’ก(How to fix) Fix [BUG] Extension fails to activate on Windows โ€” hardcoded Linux path in extension.js (v2.1.136)