diff --git a/include/class.file.php b/include/class.file.php
index ce662085ae0b62af1163ce451bca4b08bd31e8ca..21c9bff4a0ca45739b21b78a3fdd7482afb0d60c 100644
--- a/include/class.file.php
+++ b/include/class.file.php
@@ -243,7 +243,7 @@ class AttachmentFile {
     }
 
     function download($disposition=false, $expires=false) {
-        $disposition = $disposition ?: 'attachment';
+        $disposition = $disposition ?: 'inline';
         $bk = $this->open();
         if ($bk->sendRedirectUrl($disposition))
             return;