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    if (pathinfo($replacement->uri, PATHINFO_EXTENSION) == pathinfo($file->uri, PATHINFO_EXTENSION)) {

      if ($new_file_uri = file_unmanaged_copy($replacement->uri, $file->uri, FILE_EXISTS_REPLACE)) {

        // Remove temporary file.

        file_delete($replacement);

      }

    } else {

      if (!empty($form_state['values']['replace_keep_original_filename'])

      && $form_state['values']['replace_keep_original_filename']) {

        $destination_uri = rtrim($file->uri, drupal_basename($file->uri)) . drupal_basename($file->uri);

      }

      else {

        $destination_uri = rtrim($file->uri, drupal_basename($file->uri)) . drupal_basename($replacement->uri);

      }

      $replace_mode = $destination_uri == $file->uri ? FILE_EXISTS_REPLACE : FILE_EXISTS_RENAME;

      if ($new_file_uri = file_unmanaged_copy($replacement->uri, $destination_uri, $replace_mode)) {

        // @todo Add watchdog() about replaced file here?

        // Remove temporary file.

        file_delete($replacement);

        // Update if the uri target has changed.

        if ($new_file_uri != $file->uri) {

          // Store the original file uri to delete if save is successful.

          $orphaned_uri = $file->uri;

          // Update file entity uri.

          $file->uri = $new_file_uri;

        }