Some of my customers used the old QR Report dialog successfully. Here are some suggestions for the new one that would reduce confusion and work for the users.
Allow the language to set the dialog’s Reports folder so that the “Open” and “Save” buttons use that folder. Different sets of reports could be exposed for different db areas.
Display the name of the opened report in the dialog.
Let the “Save” button immediately save the current report’s changes.
Have a separate “Duplicate” or “Save as” option to create copies of a report.