Help with RT database model

Hi all!

Following the instructions of RT Wiki, I´ve downloaded the ‘’. Now I want to visualize this file (.dot) in
the dbdesigner4 but I have not success because this program needs a xml file
to load the database model.

Other thing I´ve tried is to connect from dbdesigner4 to RT database (in
Postgre) but it doesn´t recognize dbuser and password

Can anyone help me?
Thanks in advance
Best Regards