title_body: Calibre changes font coverting AZW book to EPUB I'm trying to convert an azw book to epub. Calibre completes the conversion with no problem, but the font has changed (to something ugly). I know I can use the look and feel settings to fix this, but I'm curious why this is happening. When I look inside the resulting epub file, I find a number of .ttf files with names like 00001.ttf in the fonts folder, but when I try to open one, I get a message "invalid font file". The CSS refers to the font E B Garamond, which I don't have (though I do have Garamond). 
  
  I can use the look and feel settings to substitute the Garamond font, but why are invalid font files be written? Why does the CSS name a font not present in the file?
upvoted_answer: You are best served to ask this in the Calibre Support forum on MobileRead.com.  Calibre author Kovid Goyal is an active participant.  See https://www.mobileread.com/forums/forumdisplay.php?f=166
  
  MobileRead is a privately funded site with free signup.  It's the single best site I am aware of for all things eBook.
  
  (Disclaimer: I am on staff and a moderator, thus biased. :-) )