Windows desktop: all terminal/file/task operations fail — sandbox helper program not found

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

26.825.4187.0

What subscription do you have?

pro

What platform is your computer?

Windows 11 x64

What issue are you seeing?

All terminal, file-editing, and task operations fail before the requested command starts.

Error:

Failed to create unified exec process:
orchestrator_helper_launch_failed:
setup refresh failed to launch helper:
helper=codex-windows-sandbox-setup.exe
error=program not found

The issue is reproducible with a minimal read-only command such as:
Get-Date -Format o
Get-Location

It happens before any project code is executed, so it is not specific to one repository.

I restarted Windows, used the app Repair option, and then Reset. The Codex app also auto-updated from 26.820.9563.0 to 26.825.4187.0, but the same error persists.

What steps can reproduce the bug?

1. Open the ChatGPT desktop app and switch to Codex.
2. Open any local workspace.
3. Start a new task.
4. Ask Codex to run a simple read-only command such as:
   Get-Date -Format o
   Get-Location
5. The command fails before execution with:
   orchestrator_helper_launch_failed
   setup refresh failed to launch helper:
   helper=codex-windows-sandbox-setup.exe
   error=program not found

The same failure occurs for terminal commands, file editing, and project tasks.

What is the expected behavior?

Codex should start the local sandbox and run terminal commands and file operations normally.

Additional information

I restarted Windows and observed the same failure.
I used the Windows app Repair option and then Reset, but the problem persisted.
The app auto-updated from 26.820.9563.0 to 26.825.4187.0.
The failure occurs before any project code is executed and is not specific to one repository.

Reproduce on Windows 11 x64 in the ChatGPT desktop app using Get-Date -Format o and Get-Location. Start at the sandbox setup launch path for codex-windows-sandbox-setup.exe and compare the installed app contents with the requested helper. Done means terminal, file-editing, and task operations start successfully without orchestrator_helper_launch_failed.