Hello,I just downloaded Inventor 2010 on my home computer to use for school. However, the computers at school use Inventor 2009. If i save .ipt or .iam files at home(with 2010) they will not open at school(with 2009). I have already tried exporting the files to a different cad format which works, but it does not preserve model features such as threads and also loses constraints. Is there any work-around to this problem?Thanks