The Illustrator file is compatible to Illustrator CS and higher. It is fully editable. All text is retained as editable Text Objects for maximum editability. The EPS file is compatible to Illustrator 8. It is fully editable. Layer names are retained. All text has been converted to outlines. The PDF file should be compatible to most programs which are able to read PDF files. It is fully editable in Illustrator. Layer names are retained. All text has been converted to outlines. If you don’t have them installed on your system, Illustrator will show you an error message when you open the file. Labels and city symbols are separately grouped. The symbols can be changed by editing them in the symbols palette. All symbols can be edited by double-clicking them in the symbols panel. All occurrences of the symbol on the map will then be changed simultaneously. Source.