Hi skipper, please try the updated version of the script from here:
http://moi3d.com/forum/messages.php?webtag=MOI&msg=5124.2

Use the one that says it was updated to run on OSX, that one will work on both Windows and Mac v4 because it was updated to use MoI's built in functions for working with text files rather than using an ActiveX control.

- Michael