Well, I have had enough requests to update my File Translators one page PDF for Inventor. Post this up on your wall if you work with a lot of other people's data so that you can stay on top of what format you can accept for Inventor to translate normally. Remember, unlike some other systems you do not need to have the Native program you are trying to translate from, you just need your Inventor software to perform these operations. Be cautious though, just because Inventor opens it and you get a bad result doesn't mean it was Inventor's fault. Not all CAD jockeys are created equal.