Administration > Environment Variables > APTGRPATH — Specifying the Path Names for Graphic Files
  
APTGRPATH — Specifying the Path Names for Graphic Files
Specifies the default paths for the set graphicspath option, which is the list of path names to directories used to locate graphic files not specified as absolute path names and not found in the document type directory and document cache directory. The default is Arbortext-path\graphics.
The path can also be set in the File Locations category of the Tools > Preferences dialog box.
There are two symbolic parameters (%H and %D) that may be specified as part of the search path.
If you want to make graphics files automatically accessible, use the Arbortext-path\custom\graphics directory to load them automatically upon startup.