Three-dimensional model created with Peak3D, a computer graphics 3d modeling program; supports both 2D and 3D images with support for polygons, cameras, and multiple types of lighting effects.
The P3D file extension is related to Operation Flashpoint computer game, a first person military shooter, developed by Bohemia Interactive and released in 2001. A *.p3d file contains game model used in the game. P3D file extension is also used in Prototype game from Activision, however these formats are most likely not related.