[BUG] /desktop command fails when Claude Desktop is installed via Anthropic's MSIX installer (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?

/desktop command fails when Claude Desktop is installed via Anthropic's MSIX installer

What Should Happen?

Claude Desktop should open

Error Messages/Logs

Failed to open Claude Desktop. Please try opening it manually.

Steps to Reproduce

1. Download and install Claude Desktop from the Anthropic website (MSIX installer)
2. Open a Claude Code CLI session
3. Run /desktop

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code CLI: 2.1.156 Claude Desktop version: 1.9659.2.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Likely cause: CLI looks for %LOCALAPPDATA%\AnthropicClaude\claude.exe (traditional installer path), doesn't check the MSIX/WindowsApps location

Install path: C:\Program Files\WindowsApps\Claude_1.9659.2.0_x64__pzs8sxrjxfjjc\