What is an avl file and how do I open an avl file?

GIS applications are classified as graphic information system software, and files affixed with the .avl extension are used as data files by the ArcGIS Desktop software. This program is a GIS mapping application that can be used to create maps and other graphic documents with geographical details. These AVL files are also called ArcView legend files, because data stored in files with the AVL extension refer to details and pieces of information specific to certain objects integrated by the user into a GIS map created with the software (these GIS maps are files saved with the .avp extension). When a user accesses the content of an ArcGIS Desktop map, the software locates the AVL files corresponding to the map and displays the symbologic text content stored in these associated AVL files. The ArcGIS Desktop application can be installed in computers running on Microsoft Windows systems to implement support for these AVL files and to also start creating GIS maps using the features implemented into this application by ESRI, the developer of this software.