AutoCAD tiles saved in versions later than AutoCAD 2007 cannot be opened in Adobe Illustrator CC (2017). Adobe Illustrator CC (2017) supports only the .DWG AutoCAD file format. While importing an AutoCAD file in Adobe Illustrator CC (2017). you can scale the file and select the layout to import, Adobe Illustrator CC (2017) supports 2d AutoCAD objects, including paths, lines, texts but not 3D objects.