.PLA

.PLA file: the ArchiCAD Archive file type.

.pln

.PLN file is the standard ArchiCAD file format .BPN files (backup ArchiCAD files), .TPL files (template ArchiCAD  files), .GSM files (object ArchiCAD  files), .LCF (library container ArchiCAD files), .PLA file: the ArchiCAD Archive file type.    

.PLN

.PLN file is the standard ArchiCAD file format