There is only one file type that uses the .PC6 extension:
PowerCADD 6 Drawing File
Drawing file created with PowerCADD 6, a Macintosh CAD program; may contain architectural designs, floor plans, machinery assemblies, or 2D drawings.
NOTE: PowerCADD may not add the ".pc6" file extension by default, but it may be added by the user.
|Engineered Software PowerCADD 6|
Updated: March 13, 2008