4C$ file extension is for 4Cast/2 Datafile
Similar to 4C$
0 - Compressed harddisk data DoubleSpace000 - Common filename extension GEOS
000 - Compressed harddisk data DoubleSpace
001 - Fax Hayes JT FAX many
075 - 75x75 dpi display font Ventura Publisher
085 - 85x85 dpi display font Ventura Publisher
091 - 91x91 dpi display font Ventura Publisher
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