ChatGPT Desktop (OpenAI.Codex) fails to start after update with "spawn EINVAL" on Windows 10

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

6.707.12708.0

What subscription do you have?

chatgpt plus

What platform is your computer?

Windows 10 22H2

What issue are you seeing?

<img width="540" height="237" alt="Image" src="https://github.com/user-attachments/assets/20764249-b121-4e95-ad72-a79ee127fb4e" />

Summary

After updating from the previous Codex desktop app to the new ChatGPT Desktop app, the application can no longer start.

The only error shown is:

ChatGPT failed to start.
spawn EINVAL

The application has never launched successfully after the update.

Environment

OS:

• Windows 10 22H2
• Build 19045.6466
• x64

App:

• Package: OpenAI.Codex
• Version: 26.707.12708.0

Package status:

Status: Ok

Install location:

C:\Program Files\WindowsApps\OpenAI.Codex_26.707.12708.0_x64__2p2nqsd0c76g0

What I've tried

• Uninstall and reinstall from the official OpenAI download page
• Microsoft Store reports the app is fully up to date
• Reboot Windows
• Reset Microsoft Store cache (wsreset)
• Package status is "Ok"
• LocalState and LocalCache are empty
• Windows Event Viewer contains no related Application Error entries

PowerShell

Get-AppxPackage OpenAI.Codex

Result:

Name: OpenAI.Codex
Version: 26.707.12708.0
Status: Ok

USERNAME=user
USERPROFILE=C:\Users\user

Expected behavior

ChatGPT Desktop should launch normally.

Actual behavior

Immediately shows:

"ChatGPT failed to start"
"spawn EINVAL"

and exits.

Additional information

The previous Codex desktop app worked correctly before updating.
The issue started immediately after the update to the new ChatGPT Desktop app.

What steps can reproduce the bug?

This error message appears when you try to start the program, preventing you from proceeding to the next step.

What is the expected behavior?

_No response_

Additional information

_No response_