diff --git a/blocks/html/lib.php b/blocks/html/lib.php
index 17d98cecb28..a2555c3f88e 100644
--- a/blocks/html/lib.php
+++ b/blocks/html/lib.php
@@ -28,9 +28,10 @@
  * @param string $filearea file area
  * @param array $args extra arguments
  * @param bool $forcedownload whether or not force download
+ * @param array $options additional options affecting the file serving
  * @return bool
  */
-function block_html_pluginfile($course, $birecord_or_cm, $context, $filearea, $args, $forcedownload) {
+function block_html_pluginfile($course, $birecord_or_cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
     global $SCRIPT;
 
     if ($context->contextlevel != CONTEXT_BLOCK) {
@@ -64,7 +65,7 @@ function block_html_pluginfile($course, $birecord_or_cm, $context, $filearea, $a
     }
 
     session_get_instance()->write_close();
-    send_stored_file($file, 60*60, 0, $forcedownload);
+    send_stored_file($file, 60*60, 0, $forcedownload, $options);
 }
 
 /**
diff --git a/blocks/upgrade.txt b/blocks/upgrade.txt
index a87cbf8d1ff..b7e288e9c9b 100644
--- a/blocks/upgrade.txt
+++ b/blocks/upgrade.txt
@@ -1,6 +1,12 @@
 This files describes API changes in /blocks/* - activity modules,
 information provided here is intended especially for developers.
 
+=== 2.3 ===
+
+required changes in code:
+* block_xxx_pluginfile() is now given the 7th parameter (hopefully the last one) that
+  contains additional options for the file serving. The array should be re-passed
+  to send_stored_file().
 
 === 2.0 ===
 
diff --git a/lib/filelib.php b/lib/filelib.php
index 1d4a019cb36..31093981ad6 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -3976,7 +3976,7 @@ function file_pluginfile($relativepath, $forcedownload, $preview = null) {
         $filefunction = $component.'_pluginfile';
         if (function_exists($filefunction)) {
             // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
-            $filefunction($course, $birecord, $context, $filearea, $args, $forcedownload);
+            $filefunction($course, $birecord, $context, $filearea, $args, $forcedownload, array('preview' => $preview));
         }
 
         send_file_not_found();