There are 4 .IAM files and 14 .IPT files. They were created in AUTODESK INVENTOR 2009. The only way to change these files to .DWG or to open in AutoCAD is to have the AUTODESK INVENTOR software. Please do not bid on this project unless you have this- trust me, it will no work with a conversion software and will not work with only AutoCAD. Need this done quickly