codex - 💡(How to fix) Fix Cannot open index.html in Codex app preview [1 comments, 2 participants]

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openai/codex#18375Fetched 2026-04-18 05:55:03
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What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.415.30602 (1773)

What subscription do you have?

Pro

What platform is your computer?

Darwin 25.3.0 arm64 arm

What issue are you seeing?

When I click index.html in Codex Explorer, nothing happens (no open and no preview). Any other file opens and shows its contents normally.

What steps can reproduce the bug?

Uploaded thread: 4b13e1d7-a668-4be6-888b-ec23cf182bca

  1. Open a project containing an index.html file.
  2. In Codex Explorer, click index.html.
  3. No preview opens and no file content panel loads.
  4. Click other files (for example .js, .css, or .md) and they open normally, confirming the issue is specific to index.html.

What is the expected behavior?

Codex should open and render index.html in the preview pane (or launch an actual preview of the page) without errors.

Additional information

This issue report was written with AI assistance.

Issue is reproducible in this thread context (session reference already included in Steps). No console/screenshot attached.

extent analysis

TL;DR

The issue with index.html not opening in Codex Explorer may be related to a specific handling or configuration for HTML files, and checking the file type associations or preview settings in Codex could provide a workaround.

Guidance

  • Verify if there are any specific settings or configurations in Codex for handling HTML files, such as file type associations or preview settings, that could be causing the issue.
  • Try renaming the index.html file to a different name (e.g., test.html) and see if it opens correctly in Codex Explorer to isolate if the issue is specific to the file name or the HTML file type.
  • Check if there are any known issues or updates related to HTML file handling in version 26.415.30602 of the Codex App.
  • Consider testing the same project and file in a different version of the Codex App or on a different platform to see if the issue is version or platform-specific.

Example

No specific code snippet is applicable in this case, as the issue seems related to the Codex App's handling of HTML files rather than code within the files themselves.

Notes

The issue might be specific to the version of the Codex App being used (Version 26.415.30602) or the Darwin platform. Without more detailed logs or error messages, it's challenging to provide a definitive fix.

Recommendation

Apply workaround: Try renaming the index.html file or checking Codex settings for HTML file handling, as this might provide a temporary solution until a potential fix is released for the identified issue.

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codex - 💡(How to fix) Fix Cannot open index.html in Codex app preview [1 comments, 2 participants]