Open PIN File
PIN is a file extension related to specialized CAD software called ArchiCAD.
About ArchiCAD
ArchiCAD is a BIM CAD-type architectural design software compiled for both Macintosh and Windows developed by the Hungarian-based company, Graphisoft.
Archicad is a complete design suite for both 2D and 3D, with visualization and other building information modeling functions for architects, designers, engineers and planners.
With a wide range of software applications, which are integrated into Archicad, they serve to cover most of the design needs of an architecture office.
In this case, the program uses the PIN files to save three-dimensional graphics.