Feature works doesen't care what type of file it's working on. The more important thing is the complexity of the model. If it's a fairly geometric shape (or sheetmetal part) with holes, cuts, bosses, then feature works will be fine. If your getting into free form shapes with lofting, sweeping, and surfacing I'm not sure the results will be what you like. SW will open native Inventor files. It may also translate them automtically like the MDT and Pro-E files. Not sure, I've never opened Inventor files.