Apply this to system.module

system.module.patch

diff --git a/modules/system/system.module b/modules/system/system.module
index 383dc8a..0625e48 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -1850,6 +1850,14 @@ function system_filetransfer_info() {
     );
   }
 
+  $backends['file'] = array(
+      'title' => t('Local file'),
+      'class' => 'FileTransferLocal',
+      'file' => 'local.inc',
+      'file path' => 'includes/filetransfer',
+      'weight' => 0,
+  );
+
   // SSH2 lib connection is only available if the proper PHP extension is
   // installed.
   if (function_exists('ssh2_connect')) {

To apply:

wget https://gist.github.com/raw/917736/de5e55c22a759bd4b37299c6c0cc38bbfce845ee/system.module.patch
patch -p1 < system.module.patch