The specs that are provided by Plant 3D are located at (.pspc & .pspx files)
C:\ProgramData\Autodesk\AutoCAD Plant 3D\Content\Specs
The catalogs that are provided by Plant 3D are located at (.pcat files)
C:\ProgramData\Autodesk\AutoCAD Plant 3D\Content\Catalogs
For default installs
Mike G (Autodesk)
Michael Gulnac
Technical Specialist
Organization
Autodesk, Inc.