Administration > Environment Variables > APTTEXFMTS — Specifying Path Names to Directories Containing Format Files
  
APTTEXFMTS — Specifying Path Names to Directories Containing Format Files
Prerequisite: Print Composer option
Specifies the search path for directories that contain the format files used by the Pubtex formatter. The directories in the APTTEXFMTS path list are searched for a .fmt file with a base name equal to the document type name. If APTTEXFMTS is not set, the format file in the document type directory is used.
If you want to make format files automatically available, use the Arbortext-path\custom\formats directory to load them automatically upon startup (avoiding the need to set an environment variable).