Everything points to the par to ipt conversion being searched as export or data exchange between Siemens Solid Edge and Autodesk Inventor.
Latest versions (2023) of Inventor still do not support direct import of Solid Edge part files and the official support suggest using exchange formats to facilitate the import.
You can find dedicated converters that can help you convert par to ipt, but otherwise you have to rely on exchange formats or alternative 3D modeling tools.
Updated: January 4, 2024