Comment by rusanu

SSMS' backup dialog has to show the server filesystem, exposed over a TDS protocol. This means the implementers cannot use any off-the-shelf OS/Shell file selector dialog (comdlg) and had to design their own. Any 'advancement' in the OS/Shell dialogs would have to be 'matched', manually, in the SSMS code base. I'm not trying to defend the visual appearance of the said dialog, I'm just trying to give context why that particular file selection dialog has nothing to do with the OS/Shell file selection dialogs. Think at it more like a query result browsing dialog.