Hi Tom, just to clarify, re:

> I tried the script, selected two edges and run the shortcut key, but nothing happens !?

The problem is your file does not contain any edges - it's all curves. The edge loop script only works with edge objects, which make up the boundaries of surfaces.

It sounds like you have got this figured out, but just in case - MoI is not designed to work with a polygon mesh type object like you're trying to use here, you probably need to use a polygon mesh editing program to work with that type of data, not MoI.

If you export your original polygon mesh object to .obj format, you could then use Max's importObj script which is here: http://moi.maxsm.net/media/files/ - find the one labeled ImportObj and there are instructions for how to install a script here: http://moi3d.com/FAQ#Q:_How_do_I_install_a_plug-in_script.3F

But basically MoI is not designed to work with that kind of polygonal 3D data, MoI is oriented around using NURBS surfaces for modeling.

- Michael