Adobe Illustrator Artwork

Adobe Illustrator Artwork (AI) is a proprietary vector graphics format used by the Adobe Illustrator program.

The original format of these files was known as "PGF", but it was later embedded in a PDF wrapper for compatibility with that format. The format is also related to EPS (Extended PostScript), and some versions of the file format are made to be compatible with that. Some forms of the file have multiple versions of the data embedded in it for multi-format compatibility.

Specs

 * 1998 Adobe Illustrator file format specification

Other links

 * Wikipedia: Adobe Illustrator Artwork
 * Wikipedia: Adobe Illustrator