Issue importing ipt files from Inventor with the CAD module

Hi,
I can't seem to import a simple IPT cad file (that has a helix built in) from inventor, the import module gives me an error back saying:
Not a valid ENTITY type for this operation

- Detail: Internal_error_translating_CAD_model
- Detail: File version is not supported
- Filename:...

Is there any version limitation on inventor files or would that be something else?
Thanks in advance,
Matthieu