1203 Adobe Illustrator Japan Image (Vector) The documents (files) created by Adobe Illustrator are PostScript language documents. A PostScript language document description that minimally conforms to the Document Structuring Conventions has two main parts: a prolog and a script. The prolog encapsulates information needed by other programs to interpret the file. The script describes the graphic elements on the page. 180 The National Archives and Records Administration / The National Archives and Records Administration 11 Jun 2012 Specifications link: http://mercator.elte.hu/~saman/hu/okt/AI7FileFormat.pdf 11 Jun 2012 application/postscript MIME com.adobe.illustrator-image Apple Uniform Type Identifier fmt/421 PUID ai File extension