2820 Graphisoft Archicad Project 6-9 Aggregate Archicad is a proprietary architectural and Building Information Modelling (BIM) software application produced by Graphisoft. Files with the .pln extension are the standard working format, whereas files with the .pla extension are the Archicad archive file type, that bundles together all components, linked images and textures into a single package. This signature does not currently distinguish between specific Archicad format types. This signature might identify Graphisoft Archicad Project files from versions other than 6-9; we hope to broaden this entry with further research. 1 Digital Preservation Department / The National Archives 11 Apr 2024 11 Apr 2024 fmt/1955 PUID pla File extension pln File extension 2306 Graphisoft Archicad Project versions 6-9 (Intel Mac, little-endian) Absolute from beginning of file, magic bytes: mm*ArchiCAD 1 Absolute from BOF 0 0 6D6D*4172636869434144 2307 Graphisoft Archicad Project versions 6-9 (big-endian) Absolute from beginning of file, magic bytes: MM*ArchiCAD 1 Absolute from BOF 0 0 4D4D*4172636869434144 2308 Graphisoft Archicad Project versions 6-9 (Intel Windows, little-endian) Absolute from beginning of file, magic bytes: WW*ArchiCAD 1 Absolute from BOF 0 0 5757*4172636869434144