Often I need to determine what version of Inventor created a particular file. This is a very easy task if you remember how to open the file in Design Assistant. Inventor users that use the Vault in daily work have probably forgotten that Design Assistant still exist since the Vault does most everything that much better. There are a few reasons to visit Design Assistant from time to time and this is one of them.
Design Assistant can be called from two locations. One is from the Windows Start panel, under Autodesk, Autodesk Inventor 2012.
The second and best way is to right click on the file you are interested in from the Open dialog in Inventor and select Desigh Assistant. This will automatically open the file you have highlighted in the application.