Fix download see BT#10254

main/document/downloadfolder.inc.php

@@ -104,6 +104,9 @@ function fixDocumentNameCallback($p_event, &$p_header)
 
     if ($remove_dir != '/') {
         $documentNameFixed = str_replace($remove_dir, '/', $documentNameFixed);
+        if (substr($documentNameFixed, 0, 1) == '/') {
+            $documentNameFixed = substr($documentNameFixed, 1, api_strlen($documentNameFixed));
+        }
     } else {
         $documentNameFixed = ltrim($documentNameFixed, '/');
     }