File preview supports Markdown but not JavaScript or CSS on Windows
Open 💬 0 comments Opened May 23, 2026 by ltz6
What happened?
In the Windows Codex app/CLI environment, file preview works for Markdown files (.md), but JavaScript (.js) and CSS (.css) files do not preview.
Expected behavior
JavaScript and CSS files should open in the preview pane similarly to Markdown files, or the UI should explain that these file types are unsupported.
Actual behavior
Markdown files can be previewed, but attempting to preview .js or .css files does not show a preview.
Environment
- OS: Microsoft Windows NT 10.0.19045.0
- Codex: codex-cli 0.130.0-alpha.5
- GitHub CLI: gh 2.89.0
Additional context
This was observed while using Codex on Windows. Please let me know if logs or a more specific reproduction trace would help.