I'm not sure when this error started happening, because generally, I run Check Book before I embed fonts.
I first noticed in mid-June that after embedding fonts, if I run Check Book, I get this error message. It has happened consistently since I noticed. As the embedding and generation of the content.opf is performed by Calibre (to my knowledge) I'm not sure where, or if, I can fix this. It also happens for ALL fonts I try to embed (I have about 4 that I have used for years)
Quote:
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The file fonts/Dion.otf has its MIME type specified as font/otf in the OPF file. The recommended MIME type for files with the extension "otf" is application/vnd.ms-opentype. You should change either the file extension or the MIME type in the OPF.
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It’s a quick fix, I just hit the "Try to correct all...” link and it's fine, but I'd like to know if there's something I need to do to not have this step.
I'm running Calibre 5.44 on Windows 11 and all my plugins are up to date.