Did you ever wonder if Inventor 2009 can natively open STEP files? Did you ever consider whether Inventor 2011 can import SAT files? of course you did!
Mark Flayler of IMAGINiT Technologies has put together this handy Autodesk Inventor file translator chart.
Stick it up on your office wall. You need never feel lost and confused again.
[Update] Cadline have posted the updated version for Autodesk Inventor 2015 here: