Qt3 menu in Centos 5.4

I installed the Qt3 in my Centos box:

sudo yum install qt-designer

The Qt3 designer is automatically added to my Application->Programming menu. When I click it, there is no respond. Maybe the path is wrong? So I modified the desktop file:

sudo vi /usr/share/applications/qt-designer3.desktop
sudo vi /usr/share/applications/qt-assistant3.desktop
sudo vi /usr/share/applications/qt-linguist3.desktop

by adding the path to the Exec. Now it worked like a charm.