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codex - 💡(How to fix) Fix [Windows] Codex Desktop crashes on launch in chrome.dll with 0xC0000005

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

148.00.7778.179

What subscription do you have?

Pro x20

What platform is your computer?

Windows 10

What issue are you seeing?

What issue are you seeing?

Codex Desktop on Windows starts and immediately exits. No visible UI appears.

Launching through Start menu / shell:AppsFolder starts a process briefly, then the AppX container is destroyed. Launching Codex.exe manually from the package copy also exits immediately.

ProcDump captures an unhandled access violation:

C0000005.ACCESS_VIOLATION

Visual Studio dump inspection shows the crash in chrome.dll.

Call stack:

chrome.dll!00007ff94bb9963b() chrome.dll!00007ff94a235ad3() chrome.dll!00007ff94a20b3f6() chrome.dll!00007ff94a16b761() chrome.dll!00007ff947745994() chrome.dll!00007ff9476f566a() chrome.dll!00007ff9476f4d21() chrome.dll!00007ff9476f3184() Codex.exe!00007ff7eed18011() Codex.exe!00007ff7eed15f66() Codex.exe!00007ff7eeebfed2() kernel32.dll!00007ffaa25d7374() ntdll.dll!RtlUserThreadStart()

Version / environment

Codex Windows Store app: 26.527.3686.0 Package: OpenAI.Codex_26.527.3686.0_x64__2p2nqsd0c76g0 AppID: OpenAI.Codex_2p2nqsd0c76g0!App

Codex.exe version: 148.00.7778.179 chrome.dll version: 148.00.7778.179

OS Windows 10.0.19041.*

What have you tried?

  • Reinstall attempted.
  • Start menu / shell launch tested.
  • Direct Codex.exe launch tested from copied package folder.
  • ProcDump captured crash.
  • Visual Studio dump inspection points to chrome.dll.
  • No useful Codex logs found.
  • Application event log did not show a normal crash event.
  • AppModel-Runtime/Admin shows process creation followed by AppX container destruction.

Tested Chromium flags; all crash the same:

--disable-gpu --disable-gpu-compositing --disable-direct-composition --disable-features=Vulkan,UseSkiaRenderer,CanvasOopRasterization --no-sandbox

Loaded modules / injection check

No obvious third-party injected DLLs were present in the module list. The module list appears to contain only Codex/Chromium DLLs and Windows system DLLs.

What steps can reproduce the bug?

Starting the app via icon does nothing (app crashes immediately).

What is the expected behavior?

No response

Additional information

No response

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codex - 💡(How to fix) Fix [Windows] Codex Desktop crashes on launch in chrome.dll with 0xC0000005