Yes, of course opening a file is not so obvious

' Just remember that importing a file from a modelling software to another is a huger mess. This are the most complicate kind of software around.
Ah, before choosing which one to learn, I recommend you to have a look to the compatibility of DA:O models. IE: NWN2 was only compatible with 3ds Max, not even with Maya, which is a product of the same software house than Max. :-/
Since you are in University, you are a student. This mean you can have a licence of 3ds Max for free. It's completely legal ;-)