Yes, and actually the Calibre reader render those fonts correctly. There must be something wrong with my PC at home...
BTW, they are actually very small (they must be small also in the original AZW3, obviously) and Windows XP cannot open them as TTF fonts. Maybe they're coded in some strange way, stripping away most of the unused characters? They could be very useful to produce downsized eBooks.
Thank you very much.