ARCHICAD File Types Opened by ARCHICAD
Solo Projects (.pln) are the main native document type of ARCHICAD.
Opening a Backup Project file (.bpn) allows you to recover the last saved version of a damaged project file, provided that the Make Backup Copy checkbox is active in Options > Work Environment > Data Safety & Integrity.
Note: To open a Teamwork file saved in earlier ARCHICAD versions (12 and earlier), use the Open Project command (not the Open Teamwork Project command).
Important note: In the 3D Window, this option is only available with the Vectorial 3D Engine - not available in OpenGL mode.