What is a FAN file? A FAN file is a font annotation file created by MakeMusic Finale, a scorewriter for Windows and macOS. It contains kerning data Finale uses to align font characters. Each Finale font uses its own FAN file.

More Information FAN file open in MakeMusic Finale MakeMusic Finale is a professional music composition program used by composers. As part of creating musical scores, composers can add text that uses different fonts. Each Finale font is accompanied by a FAN file, which contains annotations that define the height and width of each font character. Composers can also install third-party fonts and use them with Finale. When they do so, they must create a FAN file to accompany those fonts. Composers create new FAN files from Finale's Preferences → Edit menu, by selecting the Font Annotation... button. NOTE: By default, Finale stores FAN files in the ~/​MakeMusic/​Finale ##/​Font Annotation directory.