# EPUBCheck OPF-029: The file … does not appear to match the…

Source: https://epublab.com/epubcheck/opf-029/ (updated 2026-11-03)

EPUBCheck OPF-029 is an error message: “The file "…" does not appear to match the media type …, as specified in the OPF file.” A file's content does not match the media type declared for it in the manifest.

- Official message (EPUBCheck 5.4.0): The file "%1$s" does not appear to match the media type %2$s, as specified in the OPF file.
- Default severity: Error

## Typical causes

- A PNG declared as image/jpeg (or the reverse), or a file that was converted without updating the manifest.

## How to fix it

- Change the media-type in the manifest to the file's real format, or convert the file.

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.