Codex Windows app silently exits on Korean Windows user profile path, works on English local account

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

26.609.3341.0 from Microsoft Store

What subscription do you have?

pro

What platform is your computer?

window

What issue are you seeing?

Environment:

• Windows 11 Pro, ko-KR
• Codex app: 26.609.3341.0 from Microsoft Store
• Codex CLI: 0.139.0
• Original Windows user profile: C:\Users\국수약국
• English test account: C:\Users\codextest

Symptoms:

• Codex Windows app launches then immediately exits with no UI.
• Start-Process shell:AppsFolder\OpenAI.Codex_2p2nqsd0c76g0!App returns no visible error.
• AppModel-Runtime shows process created and container deleted shortly after.
• Application log does not show a useful Codex crash entry.
• Reinstall, Reset-AppxPackage, wsreset, CODEX_HOME=C:\codex-home did not fix the app.
• Codex CLI works and codex doctor reports 17 ok, 0 warn, 0 fail.
• Same Codex Windows app works correctly on a new English local admin account.

Important observation:

• Previous config contained mojibake paths such as C:\Users\援?닔?쎄뎅\..., derived from the Korean username.
• This broke MCP/node_repl paths until config was reset.
• After config reset, CLI works, but the Windows app still silently exits under the Korean user profile.

Expected:

• Codex Windows app should support non-ASCII Windows user profile paths, including Korean usernames.
• If unsupported, app should show a clear error and recommend a workaround instead of silently exiting.

Actual:

• App silently exits under Korean user profile path.

What steps can reproduce the bug?

install

What is the expected behavior?

_No response_

Additional information

_No response_