Claude Desktop on Windows Broke MCP (github.com)

A bug in the Claude Desktop application for Windows has been identified, where it incorrectly handles configuration files due to issues with the MSIX packaging format. Users who click the "Edit Config" button are directed to an outdated configuration file location, leading to silent failures when attempting to set up MCP server configurations. The app is reading from a virtualized filesystem path, while the "Edit Config" button opens a file from the standard path mentioned in the official documentation, creating confusion and significant troubleshooting challenges for users. This issue poses a significant obstacle for the AI/ML community using Claude Desktop, as it disrupts the normal functionality expected by developers and users alike, affecting any implementation of server configurations. Without error messages or logs indicating problems, users may waste hours verifying their settings without discovering the underlying issue. Proposed solutions include updating the app to open the correct configuration file directly, providing proper diagnostic messages, and improving documentation to reflect the realities of the MSIX virtualized environment.