Bug 85506 [Import/Export] [Preferences] import preference wizard uses a "save" dialog.
I20050215-2300 The import preferences wizard provides a browse button to select the file you wish to import from. However, it creates a Save As dialog. When you select the file you wish to import you are greeted with a warning that the file will be overwritten. No such thing occurrs, and otherwise the import succeeds.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/preferences/WizardPreferencesPage.java
if (!getOverwriteExisting()) {
                String msg = NLS.bind(PreferencesMessages.WizardPreferencesExportPage1_overwrite, file.getAbsolutePath());
                if (!queryYesNoQuestion(msg))
                    return false;
            }
            file.delete();
        } else if (!file.isDirectory()) {
            File parent = file.getParentFile();
            if (parent != null)
                file.getParentFile().mkdirs();
        }
        return true;
    }
    
    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.dialogs.WizardDataTransferPage#saveWidgetValues()
     */
    protected void saveWidgetValues() {
        
        internalSaveWidgetValues();
    }
    /**
     * The Finish button was pressed. Try to do the required work now and answer
     * a boolean indicating success. If false is returned then the wizard will
     * not close.
     * 
     * @return boolean
     */