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Information about AI file format

Name AI
Full name AI - Adobe Illustrator Artwork
File extension .ai
MIME type application/post-script
Developed by Adobe Systems
Type of format Vector image format
Description Adobe Illustrator Artwork (AI) is a proprietary file format developed by Adobe Systems for representing single-page vector-based drawings in either the EPS or PDF formats. The .ai filename extension is used by Adobe Illustrator. The AI file format was originally a native format called PGF. PDF compatibility is achieved by embedding a complete copy of the PGF data within the saved PDF format file.
Technical details The same "dual path" approach as for PGF is used when saving EPS-compatible files in recent versions of Illustrator. Early versions of the AI file format are true EPS files with a restricted, compact syntax, with additional semantics represented by Illustrator-specific DSC comments that conform to DSC's Open Structuring Conventions.
Associated programs Adobe After Effects, Cinema 4D, CorelDRAW, Corel Paint Shop Pro, Ghostscript, Inkscape.
Wiki https://en.wikipedia.org/wiki/Adobe_Illustrator_Artwork