Windows: deleting archived Codex chats fails despite enabled delete button

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

Codex Desktop / Windows package version: 26.901.6511.0 (verified from the installed OpenAI.Codex package on 2026-09-06).

What platform are you using?

Microsoft Windows 11, x64.

What issue are you seeing?

The Settings > Archived chats page shows the trash-can delete button and the “Delete all” button, but deleting an archived Codex chat fails. The UI displays the error:

无法删除已归档聊天

(English equivalent: “Failed to delete archived chat”.)

The archived chat remains visible after the failed operation.

Steps to reproduce

1. Archive a Codex chat from the desktop app.
2. Open Settings > Archived chats.
3. Click the trash-can icon beside an archived chat.
4. Confirm deletion if prompted.
5. Observe the “无法删除已归档聊天” error and that the chat remains.

Expected behavior

After confirmation, the archived chat should be removed from the archived-chat list and permanently deleted according to the documented Codex chat-deletion behavior. If deletion is unsupported for a host or chat type, the UI should explain that clearly instead of presenting an enabled delete button.

Additional information

The official Help Center documents deletion from Settings > Archived chats, so this is not an intentional “archive-only” limitation:
https://help.openai.com/en/articles/20001333-how-to-archive-and-delete-codex-chats-in-the-chatgpt-app

A similar report exists as openai/codex#28095 (“Archived chats show a Delete button, but deletion does not work”), although that report used an older macOS build.

Local desktop logs show the app issued a thread/delete request for an archived conversation, but the UI still reported failure. No account identifiers, conversation contents, or local paths are included here.

Please investigate the Windows archived-chat deletion path, including host capability detection and the handling of the thread/delete response/error.

Start by tracing the Windows Settings > Archived chats delete action and the logged thread/delete request, then inspect host capability detection and response/error handling. Done means an archived chat is removed after confirmed deletion, or the UI clearly explains when deletion is unsupported; compare behavior with the related archived-chat report if useful.