FAC file extension is for Bitmap graphics
UNIX Faceserver image file Usenix FACE
Similar to FAC
3T4 - Util3 Binary file converter to ASCII
4C$ - 4Cast/2 Datafile
4GE - Informix 4G Compiled source code file
4GL - Informix 4GL language source code file
4MD - Musical file
4SW - 4DOS Swap file
4TH - Forth language source code file
ForthCMP - LMI Forth
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