.FFIL File Extension
What is an FFIL file?
Collection of fonts used by Mac OS X; stored in a "suitcase" format than may contain multiple bitmap or TrueType fonts; should be stored in the System Fonts or user Fonts folder.
NOTE: Mac OS X font suitcase files use "FFIL" as the file type info code. Some FFIL files may have a different file extension such as .DFONT.