The only fixing part is to fix incorrect or outdated font mimetypes but that can be done in other ways since that plugin is now using old mimetypes that have since been deprecated.
Perhaps a plugin that can audit or correct the opf mimetype (or even updates them to current values) might prove useful.
We can map all file extensions except for .xml to a specific mimetype and we could try to verify each mimetype matches roughly the file contents but that depends in large part on magic byte strings being identifiable in each binary type file.
Is that what you are looking for?
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