/* Demos */
$field = new SortableUploadField('Download');
$field->setTitle('Download');
$field->setFolderName('repository/prodotti/download');
// Aggiungo .exe alle possibili estensioni
$allowed = $field->getAllowedExtensions();
$allowed[] = 'exe';
$field = $field->setAllowedExtensions($allowed);
$fields->addFieldToTab('Root.Files', $field);