Solo project file that contains a 3D model created with ArchiCAD architectural design software; used by architects to design building structures, interiors, exteriors, and landscapes; uses the Archicad Virtual Building technology to simulate the way a real building is constructed.

Configuration file formatted in XML that stores a flight plan for Microsoft's Flight Simulator; specifies parameters to the Flight Planner including departure location, destination, route type, waypoints, cruising altitude, and other information.

PLN files are used by Flight Simulator version 2000 and later.

Planogram created with ACNielsen Spaceman software; used for merchandising applications, such as retail store layouts; utilized by both retailers and suppliers to plan and analyze product placement.

PLN files can be created with Spaceman Stock Planner or Spaceman Merchandiser. They are saved in a text-based format that can be viewed with Spaceman Viewer.