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/WizardPreferencesImportPage1.java
service.applyPreferences(prefs, filters);
                } catch (CoreException e) {
                    WorkbenchPlugin.log(e.getMessage(), e);
                    return false;
                }
            }
        } finally {
            if (fis != null)
                try {
                    fis.close();
                } catch (IOException e) {
                    WorkbenchPlugin.log(e.getMessage(), e);
                }
        }
        return true;
    }
    /**
     * Handle events and enablements for widgets in this page
     * 
     * @param e
     *            Event
     */
    public void handleEvent(Event e) {
        if (e.widget == destinationNameField)
            setPreferenceTransfers();
        super.handleEvent(e);
    }
}