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diff --git a/web/core/modules/file/src/Plugin/Field/FieldFormatter/FileExtensionFormatter.php b/web/core/modules/file/src/Plugin/Field/FieldFormatter/FileExtensionFormatter.php
new file mode 100644
index 000000000..afe1b7efc
--- /dev/null
+++ b/web/core/modules/file/src/Plugin/Field/FieldFormatter/FileExtensionFormatter.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\file\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemInterface;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Formatter to render a filename as file extension.
+ *
+ * @FieldFormatter(
+ *   id = "file_extension",
+ *   label = @Translation("File extension"),
+ *   field_types = {
+ *     "string"
+ *   }
+ * )
+ */
+class FileExtensionFormatter extends BaseFieldFileFormatterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    $settings = parent::defaultSettings();
+
+    $settings['extension_detect_tar'] = FALSE;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+    $form = parent::settingsForm($form, $form_state);
+    $form['extension_detect_tar'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Include tar in extension'),
+      '#description' => $this->t("If the part of the filename just before the extension is '.tar', include this in the extension output."),
+      '#default_value' => $this->getSetting('extension_detect_tar'),
+    ];
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function viewValue(FieldItemInterface $item) {
+    $filename = $item->value;
+    if (!$this->getSetting('extension_detect_tar')) {
+      return pathinfo($filename, PATHINFO_EXTENSION);
+    }
+    else {
+      $file_parts = explode('.', basename($filename));
+      if (count($file_parts) > 1) {
+        $extension = array_pop($file_parts);
+        $last_part_in_name = array_pop($file_parts);
+        if ($last_part_in_name === 'tar') {
+          $extension = 'tar.' . $extension;
+        }
+        return $extension;
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function isApplicable(FieldDefinitionInterface $field_definition) {
+    // Just show this file extension formatter on the filename field.
+    return parent::isApplicable($field_definition) && $field_definition->getName() === 'filename';
+  }
+
+}