How to copy Primavera projects from new version to old version

Primavera P6 users always face such a situation: they want to copy their projects from old version to new version, vice versa. Oracle Primavera does offer import/export feature to do such jobs. But it's not so efficient, in particuar, when you need mass copy of projects, or large number of projects to transfer. In my case, I need to help my client to copy a lot of projects from the production database to the acceptance database. What I did is to use a tool called Primavera Database Utility I found on http://www.eppmsoft.com. With such a tool, and within minutes, I finished copying Primavera projects from production to acceptance. All project codes, activity codes, resource codes, cost accounts, and UDFs are copied to the acceptance too. Nice tool!