The Amiga uses two diferent styles of Fonts Bitmap and Outline. Bitmap Fonts are defined as a pattern of dots that compose a character. Bitmap font files are stored on disk for each size. Outline font character shapes are defined mathematically and are generated to whatever size or resolution needed.
Font information is stored differently for bitmap and outline fonts.
For each bitmap font you will find a subdirectory and a .font file. The font sub-directory contains files for the different point sizes that are available. For example, for the Emerald font, there is a Emerald sub-directory and an Emerald.font file. After these have been added run FIXfonts to create the .font file for the new additions. The Compugraphic Intellifont outline font system used on the Amiga stores font data differently.