Windows GitHub OAuth callback fails with "Unable to find Electron app #25864

Error launching app

Unable to find Electron app at:
...\oauth_callback?code=...

Cannot find module:
...\oauth_callback?code=...

The browser prompt before the error is:

This site is trying to open Codex.
https://chatgpt.com wants to open this application.

### What steps can reproduce the bug?

1. Open Codex Desktop App on Windows.
2. Go to Plugins → GitHub.
3. Click "Connect GitHub".
4. Complete GitHub authentication in the browser.
5. Browser displays: "This site is trying to open Codex".
6. Click "Open".
7. Codex opens/focuses, but then shows the Electron error dialog.

Environment:

- Codex version: 26.527.60818
- Windows 11 24H2
- OS Build: 26100.8457
- Architecture: x64
- Subscription: ChatGPT Plus



### What is the expected behavior?

After clicking "Open" in the browser prompt, Codex should receive and process the `codex://oauth_callback?...` URL and complete the GitHub connection successfully.

### Additional information

Additional diagnostics:

Windows recognizes the application as:

OpenAI.Codex_2p2nqsd0c76g0!App

Registry check:

HKEY_CLASSES_ROOT\codex exists

However:

HKEY_CLASSES_ROOT\codex\shell\open\command does not exist

The browser successfully invokes the codex:// protocol and launches Codex. The failure appears to occur when Codex processes the OAuth callback URL:

codex://oauth_callback?code=...

This looks like a Windows-specific OAuth callback / protocol handler issue. The callback URL appears to be interpreted as an Electron application/module path instead of being handled as an OAuth redirect.