Hi eric, I'm glad that the right-click import will work for you!

One of the things I've just finished for v3 is updating the OpenNURBS library that MoI uses to the latest version. That means that MoI v3 should be able to preserve stuff like linestyles when you open and save a Rhino v4 file and it can also now open up Rhino v5 files as well.

- Michael