Windows app 26.616.10790.0: codex-windows-sandbox-setup.exe fails with "The specified module could not be found"

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

26.616.10790.0

Installed AppX package from PowerShell:

Name            : OpenAI.Codex
Version         : 26.616.10790.0
Architecture    : X64
InstallLocation : C:\Program Files\WindowsApps\OpenAI.Codex_26.616.10790.0_x64__2p2nqsd0c76g0
PackageFullName : OpenAI.Codex_26.616.10790.0_x64__2p2nqsd0c76g0

What subscription do you have?

No response

What platform is your computer?

Windows 10 Pro x64

PowerShell Get-ComputerInfo output:

WindowsProductName         : Windows 10 Pro
WindowsVersion             : 2009
OsHardwareAbstractionLayer : 10.0.26100.1
OsArchitecture             : 64-bit

What issue are you seeing?

Codex Desktop on Windows shows a native Windows error dialog for:

C:\Program Files\WindowsApps\OpenAI.Codex_26.616.10790.0_x64__2p2nqsd0c76g0\app\resources\codex-windows-sandbox-setup.exe

The dialog message is shown in Chinese as:

找不到指定的模块。

English translation:

The specified module could not be found.

This appears to be the same Windows sandbox helper failure reported in earlier issues, but it is still reproducing on the newer Windows app package 26.616.10790.0.

Related issues I found:

• #28982
• #29200
• #29418

What steps can reproduce the bug?

1. Open the Codex Windows app.
2. Start a Codex session in a local workspace.
3. Let Codex run commands / use the Windows sandbox helper path.
4. A Windows error dialog appears for codex-windows-sandbox-setup.exe.
5. The dialog says 找不到指定的模块。 / The specified module could not be found.

What is the expected behavior?

The Windows sandbox helper should launch successfully and complete setup without showing a modal Windows error dialog.

Additional information

A screenshot is available showing the exact Windows dialog. The visible executable path in the dialog is the packaged Codex app path under:

C:\Program Files\WindowsApps\OpenAI.Codex_26.616.10790.0_x64__2p2nqsd0c76g0\app\resources\codex-windows-sandbox-setup.exe

The dialog is localized in Chinese and only reports that the specified module could not be found; it does not identify which dependent module is missing.