creation of nodes - filefield

Try something like this:

/**
 * helper function
 */
function _my_widget_files_directory($field) {
  $widget_file_path = $field['widget']['file_path'];
  if (module_exists('token')) {
    global $user;
    $widget_file_path = token_replace($widget_file_path, 'user', $user);
  }
  return file_directory_path() .'\\'. $widget_file_path;
}

function my_node_import_function() {
  module_load_include('inc', 'filefield', 'field_file');
...

  $file = array();
    $nodetype = (object) content_types('node_type_here');
    if ($nodetype->fields) {
      foreach ($nodetype->fields as $field) {
        if ($field['type'] == 'filefield') {
          $field = content_fields($field['field_name'], 'report');
          $validators = filefield_widget_upload_validators($field);
          $files_path = _my_widget_files_directory($field);
          break;
        }
      }
    }
    $node->title = t('My title');
    $node->type = 'node_type_here';
    $node->$field['field_name'] = array(0 => $file);
    nodes_save($node);
...
}

Obviously this will not work for multiple filefields on the same node type, but w/ a little tweaking it could do that too.

Hope this pushes you in a helpful direction.

Eclipse