It should be quite possible to export Autodesk Invertor CAD files (.part) files as DXF drawings (.dxf), which are commonly used as exchange format between various CAD programs. Except for the obvious choice for ipt to dxf conversion, Autodesk Inventor, some other CAD software or dedicated converters might be of help as well. You can also find online converters that can do this through web browser.
Open IPT file Open DXF fileA CAD converter with huge format support
A 3D CAD translation software