Joomla extension

I need a Joomla 1.7 extension to create users from a csv file. I use the profile plugin (Joomla 1.7) to extend the user information stored in joomla. This extension must be available from the backend. I need something similar to the "userport 3.0" extension but with the ability to store the extra information on the #_user_profiles table used by the profile plugin.