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diff --git a/web/modules/contrib/filefield_sources/src/File/MimeType/ExtensionMimeTypeGuesser.php b/web/modules/contrib/filefield_sources/src/File/MimeType/ExtensionMimeTypeGuesser.php
new file mode 100644
index 000000000..2c44e97ff
--- /dev/null
+++ b/web/modules/contrib/filefield_sources/src/File/MimeType/ExtensionMimeTypeGuesser.php
@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\filefield_sources\File\MimeType\ExtensionMimeTypeGuesser.
+ */
+
+namespace Drupal\filefield_sources\File\MimeType;
+
+use Drupal\Core\File\MimeType\ExtensionMimeTypeGuesser as CoreExtensionMimeTypeGuesser;
+
+/**
+ * Add methods to core guesser.
+ */
+class ExtensionMimeTypeGuesser extends CoreExtensionMimeTypeGuesser {
+
+  /**
+   * Convert mime type to extension.
+   *
+   * @param string $mimetype
+   *   Mime type.
+   *
+   * @return string|bool
+   *   Return extension if found, FALSE otherwise.
+   */
+  public function convertMimeTypeToExtension($mimetype) {
+    $this->checkDefaultMapping();
+
+    $mime_key = array_search($mimetype, $this->mapping['mimetypes']);
+    $extension = array_search($mime_key, $this->mapping['extensions']);
+
+    return $extension;
+  }
+
+  /**
+   * Convert mime type to most common extension.
+   *
+   * @param string $mimetype
+   *   Mime type.
+   *
+   * @return string|bool
+   *   Return extension if found, FALSE otherwise.
+   */
+  public function convertMimeTypeToMostCommonExtension($mimetype) {
+    $this->checkDefaultMapping();
+
+    $extension = FALSE;
+    if (isset($mimetype)) {
+      // See if this matches a known MIME type.
+      $mime_key = array_search($mimetype, $this->mapping['mimetypes']);
+      if ($mime_key !== FALSE) {
+        // If we have a match, get this list of likely extensions. For some
+        // reason Drupal lists the "most common" extension last for most file
+        // types including php, jpg, and doc.
+        if ($extensions = array_keys($this->mapping['extensions'], $mime_key)) {
+          $extension = end($extensions);
+        }
+      }
+    }
+    return $extension;
+  }
+
+  /**
+   * Check for default mapping.
+   */
+  private function checkDefaultMapping() {
+    if ($this->mapping === NULL) {
+      $mapping = $this->defaultMapping;
+      // Allow modules to alter the default mapping.
+      $this->moduleHandler->alter('file_mimetype_mapping', $mapping);
+      $this->mapping = $mapping;
+    }
+  }
+
+}