KeyCAD Complete & KeyCAD Pro was inexpensive CAD/Modeling software produced by Softkey for Macintosh and Windows. Earlier DOS version may have had KCF extension. Later versions produced by the Learning Company who bought Softkey.
Macintosh files have similar format to Windows versions.
- KEY are drawing files.
- SYM are symbol files.
KEY & SYM files have the hex values
00000064 for the first 4 bytes.