.FAC File Extension
File TypeFACE Image File
What is a FAC file?
Usenix FaceServer graphic created on a Unix system; may be viewed in XnView; can also be converted to .SGI or .RGB Silicon Graphic IRIS images using fromface, an SGI utility for the IRIX Unix-based operating system.
FAC files are more commonly seen as .FACE files. However, both formats are rarely used anymore.