Issue #1815886 by bojanz: Fixed Drupal core cannot manage files larger than 4 GB.

core/modules/file/file.install

@@ -65,6 +65,7 @@ function file_schema() {
       'filesize' => array(
         'description' => 'The size of the file in bytes.',
         'type' => 'int',
+        'size' => 'big',
         'unsigned' => TRUE,
         'not null' => TRUE,
         'default' => 0,