diff --git modules/field/field.info.inc modules/field/field.info.inc
index b7d85f3..698eace 100644
--- modules/field/field.info.inc
+++ modules/field/field.info.inc
@@ -95,6 +95,8 @@ function _field_info_collate_types($reset = FALSE) {
           $field_info += array(
             'settings' => array(),
             'instance_settings' => array(),
+            // Allow adding fields via UI.
+            'add via ui' => TRUE,
           );
           $info['field types'][$name] = $field_info;
           $info['field types'][$name]['module'] = $module;
diff --git modules/field_ui/field_ui.admin.inc modules/field_ui/field_ui.admin.inc
index 2e74cb6..e24d95e 100644
--- modules/field_ui/field_ui.admin.inc
+++ modules/field_ui/field_ui.admin.inc
@@ -700,8 +700,9 @@ function field_ui_field_type_options() {
     $field_types = field_info_field_types();
     $field_type_options = array();
     foreach ($field_types as $name => $field_type) {
-      // Skip field types which have no widget types.
-      if (field_ui_widget_type_options($name)) {
+      // Skip field types which have no widget types, or should not be add via
+      // uesr interface.
+      if (field_ui_widget_type_options($name) && !empty($field_type['add via ui'])) {
         $options[$name] = $field_type['label'];
       }
     }
@@ -787,8 +788,9 @@ function field_ui_existing_field_options($obj_type, $bundle) {
       if (!($existing_bundle == $bundle && $existing_obj_type == $obj_type)) {
         foreach ($instances as $instance) {
           $field = field_info_field($instance['field_name']);
-          // Don't show locked fields or fields already in the current bundle.
-          if (empty($field['locked']) && !field_info_instance($obj_type, $field['field_name'], $bundle)) {
+          // Don't show locked fields or fields already in the current bundle,
+          // or files that shoud not be added via user interface.
+          if (empty($field['locked']) && !field_info_instance($obj_type, $field['field_name'], $bundle) && !empty($field_types[$field['type']]['add via ui'])) {
             $text = t('@type: @field (@label)', array(
               '@type' => $field_types[$field['type']]['label'],
               '@label' => t($instance['label']), '@field' => $instance['field_name'],