Font file
From Stunts Wiki
Stunts (BB 1.1) includes three font files, which have a ".FNT" extension and a very unique format. The files in question are FONTDEF.FNT, FONTN.FNT and FONTLED.FNT. FONTDEF (probably standing for "Default Font") is the thick font used for the text in menus, dialog boxes and buttons. FONTN is used for longer text, for example, car descriptions in the showroom, scoreboard rows and the high score information when viewing the complete track in 3D in the Track menu. FONTLED only contains digits and a couple of punctuation characters and is used for the lap times in the replay menu panel.