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
* system. Answers a boolean indicating success.
     * 
     * @return boolean
     * @param directory
     *            java.io.File
     */
    protected boolean ensureDirectoryExists(File directory) {
        if (!directory.exists()) {
            if (!queryYesNoQuestion(PreferencesMessages.PreferencesExport_createTargetDirectory))
                return false;
            if (!directory.mkdirs()) {
                MessageDialog
                        .openError(
                                getContainer().getShell(),
                                PreferencesMessages.PreferencesExport_error,
                                PreferencesMessages.PreferencesExport_directoryCreationError);
                return false;
            }
        }
        return true;
    }
    /**
     * If the target for export does not exist then attempt to create it. Answer
     * a boolean indicating whether the target exists (ie.- if it either
     * pre-existed or this method was able to create it)
     * 
     * @return boolean
     */
    protected boolean ensureTargetIsValid(File file) {
        if (file.exists()) {