I was working on this all the day and finally I got it

, here is the solution:
You must create a descendant class from EditControl supporting upload operation.
Because of user profile control is AJAX compatible, you have to create an alternative control to upload file to server. Standard FileUpload WebControl will not work.
In dnn database you have to create a row in table: "dnn_Lists" in order to create the new data type.
My solution was here:
http://www.nearsolutions.net/Servicios/Descargas.aspx
You can freely download
FileUploadEditControl and GMailUpload webcontrol
GMailUpload webcontrol is for supporting upload over ajax enviroment.
Hope this work
Israel Garcia
http://www.nearsolutions.net