FileInfo.com - The File Extensions Resource

.AIP File Extension

File Type	Illustrator Plug-in
File Format	File
Common?	No
File Description	Adds extra features and capabilities to Adobe Illustrator; must be placed Plug-ins Folder within the Illustrator folder to be active
Program(s) that open aip files	Mac / Windows: Adobe Illustrator

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/aip