Adobe Illustrator Exchange

ArcGIS from ESRI has an Adobe Creative Cloud add-on which adds support for a ArcGIS map exchange. Added in 2020 with ArcGIS 2.5, the format adds some additional features beyond using PDF for exchange. Once add-on is installed Adobe Illustrator and Photoshop can open the AIX format directly.

File Information
AIX have a similar structure to PDF and begin with the ascsii