The .pln file extension is most commonly associated with the ArchiCAD design software. ArchiCAD is used to create architectural design projects. Files with the .pln extension are project files that contain a 3D model that has been created by the software.
The .pln file extension is also used for CTP scene definition files, Microsoft Flight Simulator flight plan files, Adobe InDesign plugin files and Psion Organizer spreadsheet files.
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If you have additional information about the PLN file format or software that uses files with the PLN suffix, please do get in touch - we would love hearing from you.