If you dig around in the platform documentation for Rich Edit controls, you will realize that there are three different versions of Rich Edit controls. The MFC implementation of CRichEditCtrl wraps the rich edit 1.0 control.
The Justify alignment is only implemented in Rich Edit 3.0. RE3 is only available in Windows 2000, ME and XP however, Sorry.
The different versions many times have very different implementations. Even the name of the window class has changed. When you make a rich edit in the dialog editor, it becomes a Rich Edit 1.0. You will have to insert a Custom Control with the correct Window Class of the version of Rich Edit you want to use.
Look at Rich Edit 3.0 and the PARAFORMAT2 structure.
I REALLY hope that helps.
Will
Look at Rich Edit 3.0 and