diff --git a/core/class/browser.php b/core/class/browser.php
index 0f648e4..e96634e 100644
--- a/core/class/browser.php
+++ b/core/class/browser.php
@@ -694,7 +694,7 @@ protected function sendDefaultThumb($file=null) {
             $thumb = "themes/{$this->config['theme']}/img/files/big/$ext.png";
         }
         if (!isset($thumb) || !file_exists($thumb))
-            $thumb = "themes/{$this->config['theme']}/img/files/big/..png";
+            $thumb = "themes/{$this->config['theme']}/img/files/big/period.png";
         header("Content-Type: image/png");
         readfile($thumb);
         die;
diff --git a/themes/dark/img/files/big/..png b/themes/dark/img/files/big/period.png
similarity index 100%
rename from themes/dark/img/files/big/..png
rename to themes/dark/img/files/big/period.png
diff --git a/themes/dark/img/files/small/..png b/themes/dark/img/files/small/period.png
similarity index 100%
rename from themes/dark/img/files/small/..png
rename to themes/dark/img/files/small/period.png
diff --git a/themes/default/img/files/big/..png b/themes/default/img/files/big/period.png
similarity index 100%
rename from themes/default/img/files/big/..png
rename to themes/default/img/files/big/period.png
diff --git a/themes/default/img/files/small/..png b/themes/default/img/files/small/period.png
similarity index 100%
rename from themes/default/img/files/small/..png
rename to themes/default/img/files/small/period.png