AAF File Format was used in Fallout 1&2. It stores fonts which are displayed in some parts of the game (e.g. dialog window).
I recently had some ideas related to modding this game, so based on specification provided on Fallout Wiki, I wrote a C library for reading these AAF files.
Currently it only allows saving them as PGM images, which is enough for my needs now.
Of course, there are probably ready programs which do the same (looking at you TeamX), but what would be a fun with always using foreign, ready-made applications?