File extension is used by Corel WordPerfect. Spreadsheet file.
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.
Plug-in file used by older versions of InDesign professional page layout software; adds extra features to the software, such as new styling and editing capabilities; used for third-party plugins.
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.
The PLN file extension is associated with Microsoft Flight Simulator computer game. A .pln file contains flight plan data, some sort of configuration file used in the game for plot fly routes.