PLA

PLA (ARCHICAD Archive) is a specialized archive format used by the ARCHICAD software to store a project (a PLN file) and its other associated data files, with optional compression.

Identification
It appears the files start with the ASCII characters.

Sample files

 * ARCHICAD Sample Projects are downloadable in PLA files for versions 22 and 23.

Links

 * Official site
 * ARCHICAD file types
 * Archive Files