try IIS rewrite

platform/Normal.php

@@ -5,6 +5,7 @@ function getpath()
     $_SERVER['firstacceptlanguage'] = strtolower(splitfirst(splitfirst($_SERVER['HTTP_ACCEPT_LANGUAGE'],';')[0],',')[0]);
     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
     $_SERVER['base_path'] = path_format(substr($_SERVER['SCRIPT_NAME'], 0, -10) . '/');
+    if (isset($_SERVER['UNENCODED_URL'])) $_SERVER['REQUEST_URI'] = $_SERVER['UNENCODED_URL'];
     $p = strpos($_SERVER['REQUEST_URI'],'?');
     if ($p>0) $path = substr($_SERVER['REQUEST_URI'], 0, $p);
     else $path = $_SERVER['REQUEST_URI'];
@@ -16,6 +17,7 @@ function getpath()
 
 function getGET()
 {
+    if (isset($_SERVER['UNENCODED_URL'])) $_SERVER['REQUEST_URI'] = $_SERVER['UNENCODED_URL'];
     $p = strpos($_SERVER['REQUEST_URI'],'?');
     if ($p>0) {
         $getstr = substr($_SERVER['REQUEST_URI'], $p+1);