Well, the filenames say nothing about the font encoding or about the actual font name. The only font format that one should expect being supported is OpenType, and probably TrueType, I wouldn't be surprised if PostScript fonts are not supported by ePUB readers...
If you need more comments, you should provide a complete ePUB. You can trim the contents to something minimal, replace copyrighted material with some dummy text, and use free fonts instead of commercial ones, if that's a concern.
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