User blog comment:Cookiewukk/Tsumamigui 3 font file structure/@comment-44256294-20200407170931

Awesome, good work.

I'm currently in the process of updating xsystem4 to work with the MangaGamer version of Senguku Rance, which uses a .fnl file, so this info will help a lot.

It also opens up the possibility of using condensed fonts, or adding normally unrepresentable glyphs such as accented characters which don't exist in shift-jis.