diff --git a/conf/config.php b/conf/config.php
index 048718d..6562bde 100644
--- a/conf/config.php
+++ b/conf/config.php
@@ -108,7 +108,7 @@
 
 // THE FOLLOWING SETTINGS CANNOT BE OVERRIDED WITH SESSION SETTINGS
 
-    '_normalizeFilenames' => false,
+    '_normalizeFilenames' => true,
     '_check4htaccess' => true,
     //'_tinyMCEPath' => "/tiny_mce",
 
@@ -122,5 +122,3 @@
     //'_jsMinCmd' => "java -jar /path/to/yuicompressor.jar --type js {file}",
 
 );
-
-?>
\ No newline at end of file
diff --git a/core/class/uploader.php b/core/class/uploader.php
index 9a39335..f4a3d6f 100644
--- a/core/class/uploader.php
+++ b/core/class/uploader.php
@@ -411,17 +411,7 @@ protected function checkFilePath($file) {
     }
 
     protected function checkFilename($file) {
-
-        if ((basename($file) !== $file) ||
-            (
-                isset($this->config['_normalizeFilenames']) &&
-                $this->config['_normalizeFilenames'] &&
-                preg_match('/[^0-9a-z\.\- _]/si', $file)
-            )
-        )
-            return false;
-
-        return true;
+        return (basename($file) === $file);
     }
 
     protected function checkUploadedFile(array $aFile=null) {
diff --git a/lib/helper_file.php b/lib/helper_file.php
index 4119ec9..41bb1de 100644
--- a/lib/helper_file.php
+++ b/lib/helper_file.php
@@ -198,19 +198,70 @@ static function getInexistantFilename($filename, $dir=null, $tpl=null) {
                 : basename($file));
     }
 
-/** Normalize given filename. Accented characters becomes non-accented and
-  * removes any other special characters. Usable for non-unicode filesystems
-  * @param $filename
-  * @return string */
+    /**
+     * Normalize given filename. Accented characters becomes non-accented and
+     * removes any other special characters. Usable for non-unicode filesystems
+     *
+     * @param $filename
+     * @return string
+     */
+    public static function normalizeFilename($filename)
+    {
+        return self::webalize($filename, '.');
+    }
 
-    static function normalizeFilename($filename) {
-        $string = htmlentities($filename, ENT_QUOTES, 'UTF-8');
-        if (strpos($string, '&') !== false)
-            $filename = html_entity_decode(preg_replace('~&([a-z]{1,2})(?:acute|cedil|circ|grave|lig|orn|ring|slash|tilde|uml);~i', '$1', $string), ENT_QUOTES, 'UTF-8');
-        $filename = trim(preg_replace('~[^0-9a-z\.\- ]~i', "_", $filename));
-        return $filename;
+    /**
+     * Converts to web safe characters [a-z0-9-] text.
+     *
+     * This function is derived from code of the Nette Framework (2014-07-31) (http://nette.org),
+     * which is subject to the new BSD license (http://nette.org/en/license).
+     * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
+     *
+     * @param string $s UTF-8 encoding
+     * @param string $charlist allowed characters
+     * @param bool $lower
+     * @return string
+     */
+    public static function webalize($s, $charlist = NULL, $lower = TRUE)
+    {
+        $s = self::toAscii($s);
+        if ($lower) {
+            $s = strtolower($s);
+        }
+        $s = preg_replace('#[^a-z0-9' . preg_quote($charlist, '#') . ']+#i', '-', $s);
+        $s = trim($s, '-');
+        return $s;
     }
 
-}
+    /**
+     * Converts to ASCII.
+     *
+     * This function is derived from code of the Nette Framework (2014-07-31) (http://nette.org),
+     * which is subject to the new BSD license (http://nette.org/en/license).
+     * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
+     *
+     * @param string $s UTF-8 encoding
+     * @return string ASCII
+     */
+    public static function toAscii($s)
+    {
+        $s = preg_replace('#[^\x09\x0A\x0D\x20-\x7E\xA0-\x{2FF}\x{370}-\x{10FFFF}]#u', '', $s);
+        $s = strtr($s, '`\'"^~', "\x01\x02\x03\x04\x05");
+        $s = str_replace(array("\xE2\x80\x9E", "\xE2\x80\x9C", "\xE2\x80\x9D", "\xE2\x80\x9A",
+                "\xE2\x80\x98", "\xE2\x80\x99", "\xC2\xBB", "\xC2\xAB"),
+            array("\x03", "\x03", "\x03", "\x02", "\x02", "\x02", ">>", "<<"), $s);
+        if (ICONV_IMPL === 'glibc') {
+            $s = @iconv('UTF-8', 'WINDOWS-1250//TRANSLIT', $s); // intentionally @
+            $s = strtr($s, "\xa5\xa3\xbc\x8c\xa7\x8a\xaa\x8d\x8f\x8e\xaf\xb9\xb3\xbe\x9c\x9a\xba\x9d\x9f\x9e"
+                . "\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3"
+                . "\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8"
+                . "\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf8\xf9\xfa\xfb\xfc\xfd\xfe\x96",
+                "ALLSSSSTZZZallssstzzzRAAAALCCCEEEEIIDDNNOOOOxRUUUUYTsraaaalccceeeeiiddnnooooruuuuyt-");
+        } else {
+            $s = @iconv('UTF-8', 'ASCII//TRANSLIT', $s); // intentionally @
+        }
+        $s = str_replace(array('`', "'", '"', '^', '~'), '', $s);
+        return strtr($s, "\x01\x02\x03\x04\x05", '`\'"^~');
+    }
 
-?>
\ No newline at end of file
+}