Can you have him export the Model file to a Universal file and or Archive File? Are you on TDM or Teamcenter? If you are in Teamcenter get the part into teamcenter go to file new dataset then select I-Deas part. Have not tried it myself but could be a good option. Once the part is in teamcenter send the ideas file to I-Deas Through the TCII. I think you can some how do this in TDM but my memory has faded since we went to Teamcenter.
1.-You create a part (a cube, cilinder, whatever you want) and you place it into the library.
2.-Once it is created, you go to the folder where it is stored the *.prt file of this new part. (usually ...in team/shared...) and you delete de prt file or you move it to a different folder
3.-You go to the manage library, click on this part and do a recconnect file, chosing the *.prt that the costumer sent you.
Another alternative would have been to use "adopt" within manage libraries. All part numbering/naming and versioning is lost but at least you would see the data.