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
* Answer the string to display in self as the destination type
     * 
     * @return java.lang.String
     */
    protected abstract String getDestinationLabel();
    /**
     * Answer the contents of self's destination specification widget
     * 
     * @return java.lang.String
     */
    protected String getDestinationValue() {
        return destinationNameField.getText().trim();
    }
    /**
     * Set the current input focus to self's destination entry field
     */
    protected void giveFocusToDestination() {
        destinationNameField.setFocus();
    }
    /**
     * Open an appropriate destination browser so that the user can specify a
     * source to import from
     */
    protected void handleDestinationBrowseButtonPressed() {
        FileDialog dialog = new FileDialog(getContainer().getShell(), SWT.SAVE);
        dialog.setText(PreferencesMessages.WizardPreferencesExportPage1_saveAs);
        dialog.setFilterPath(getDestinationValue());
        dialog.setFilterExtensions(new String[] { "*.epf" }); 
        String selectedFileName = dialog.open();
        if (selectedFileName != null)