Windows: local tools fail with sandbox setup error 0xC0000142

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

26.901.22334 (About dialog); Windows package: 26.901.4073.0

What subscription do you have?

plus

What platform is your computer?

Windows 11

What issue are you seeing?

Steps to reproduce:

1. Open the desktop app on the affected Windows PC.
2. Ask the assistant to run Get-Date or read a workspace file.
3. The local tool fails before completing the operation.

Expected behavior: local commands and file operations should work reliably within the permitted workspace.

What steps can reproduce the bug?

1. Open the ChatGPT desktop app on the affected Windows PC.
2. Ask it to run a basic local command such as Get-Date, or read a workspace file.
3. The tool fails with "code-mode host exited during handshake" or "orchestrator_helper_exit_nonzero" with exit code -1073741502.

Two commands briefly succeeded after a restart, but subsequent attempts failed again.

Feedback ID: 01a06c68-7b30-71b1-9287-8a6ff3c2a8ce

What is the expected behavior?

Local tools should start reliably and allow the assistant to read and create files within the permitted workspace, as they do on my notebook.

Additional information

Feedback ID: 01a06c68-7b30-71b1-9287-8a6ff3c2a8ce

The app is up to date. Restarting Windows and repairing the app through Windows Settings did not resolve the issue. The same app works on my notebook.

The report names the Windows desktop app, local tool startup, and the handshake errors but no repository file or test. Start by reproducing Get-Date or workspace-file access on Windows and trace the failing sandbox setup; done means permitted local commands and file operations complete reliably without the reported exit code.