model format

Hi, I have a model created in Inventor. Which format should I use when importing the geometry: ipt, sat, step. I tried step, but the curves & surfaces did not come in nicely, what should I do now?

Prefer STEP

STEP (.stp) is the preferred exchange format. It's most likely just the visual representation (facets) are poor, the underlying curves and surface geometry will be fine for meshing.