Computer Use cannot enumerate Windows apps: EnumWindows fails with 0x80070003

Summary

In Codex Desktop on Windows, the bundled Computer Use plugin cannot inspect or control tagged desktop applications because window enumeration fails.

Reproduction

1. Tag Microsoft Calculator in a Codex task.
2. Ask Codex to inspect Calculator and perform a calculation strictly using the Computer Use plugin.
3. Initialize @oai/sky as documented by the bundled computer-use skill.
4. Call sky.list_windows().

Actual result

EnumWindows failed: The system cannot find the path specified. (0x80070003)

Additional observations:

• sky.list_apps() fails with the same EnumWindows error.
• sky.launch_app({ app: "C:\\Windows\\System32\\calc.exe" }) returns:

  Error: node_repl exec context not found
  

• The bundled skill instructs callers to use sky.documentation("guidance"), sky.documentation("confirmations"), and sky.documentation("api"), but the loaded sky object has no documentation method.
• Calculator itself can run; the failure appears confined to the Computer Use control/runtime path.

Environment

• Codex Desktop on Windows
• Computer Use plugin skill bundle: 26.803.41515
• Date observed: 2026-08-10
• Target app: Microsoft Windows Calculator (Microsoft.WindowsCalculator_8wekyb3d8bbwe!App)

Expected result

Computer Use should enumerate the tagged Calculator window, inspect its state, send calculator input, and read the displayed result.

No personal paths, account identifiers, or user content are included in this report.

Start by reproducing the Windows Computer Use flow with the bundled computer-use skill: initialize @oai/sky, then run sky.list_windows(), sky.list_apps(), and sky.launch_app() for Calculator. Compare the loaded sky object with the skill's documented guidance, confirmations, and api calls. Done means tagged Calculator windows can be enumerated and controlled without the reported errors, and the documented interface matches the runtime object.