Codex Desktop 26.616 crashes on startup on Windows Insider Canary Build 26200

Version

OpenAI.Codex 26.616.6631.0 (Store package)

Platform

Windows 11 Pro 10.0.26200.8655 x64 (Insider Canary)
GPU: Intel Arc 130T (Driver 32.0.101.6554)

Issue

App crashes silently on startup — no window appears. 6+ crash dumps generated. Previous versions (installed 6/3–6/15) worked fine on the same OS build.

Crash Dump Analysis

Key strings found in minidumps:

• IsSandboxedProcess
• electron/js2c/sandbox_bundle
• ScopedMayLoadLibraryAtBackgroundPriority
• Failed to load Chrome DLL from
• DelayLoadFailureHook
• Loading the shim engine DLL failed
• LdrpPreprocessDllName for DLL failed
• Unable to create status tray icon

Appears to be an Electron GPU/sandbox initialization failure.

Notes

• Manifest MaxVersionTested: 10.0.26100.0; actual OS: 10.0.26200
• App data reset (LocalState/Settings/LocalCache/TempState) had no effect
• No proxy/network issues
• No Windows Error Reporting entries (Crashpad handles internally)

Steps

1. Install Codex from Store on Win11 Build 26200
2. Launch → crashes in 1–2s, no window