Deeplink Not Handled on Windows

What version of the Codex App are you using (From “About Codex” dialog)?

26.311.21342

What subscription do you have?

Pro

What platform is your computer?

Windows 11 Pro (Microsoft Windows NT 10.0.26200.0 x64)

What issue are you seeing?

The Windows version of the app is not handling deeplinks. The codex uri handler does not seem to be registered.

After getting a codex URI using the "Copy deeplink" the following is copied to your clipboard: codex://threads/{threadId} (actual threadId replaced)

After trying to run this, you get the following popup:

<img width="560" height="240" alt="Image" src="https://github.com/user-attachments/assets/501258fd-ad66-47e9-b998-eba9cf7ea8c5" />

What steps can reproduce the bug?

1. In Codex Desktop on Windows, open a thread.
2. Click the "..." menu in the thread pane next to the thread name.
3. Click Copy deeplink
4. Open Run Dialog, paste the deeplink and press enter.

What is the expected behavior?

It should navigate the Codex desktop app to the specified thread.

Additional information

_No response_