> Generally yes, but you broke the dialog. I cannot open the UI file with Qt > 4.2.3's designer.
You need to update to a more recent Qt designer because the UI format of Qt 4.2 is outdated. (Qt 4.2 was released 3 years ago.)
You can use the Qt designer of Qt 4.4.x or 4.5.x or the Qt creator since version 1.0. regards Uwe