I found a EPUB file where the font is not displayed.
I get the impression that this problem occurs when the font is obfuscated in such a way (subsets?) that Windows stops treating the file as a font. That's why the system fontview says "this is not a valid font file".
Last edited by BeckyEbook; 03-03-2020 at 07:14 AM.
Reason: Added information about subsets fonts.
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