I followed the tutorial: http://mel.melaxis.com/devblog/2005/08/06/localizing-php-web-sites-using-gettext/
about gettext extension in php (I unchecked a comment in php.ini)
Gettext is activated, but does not show translation (German).
Here are the files:
C: \ WAMP \ WWW \ PHP Test \ test.php:
<?php
require_once("localization.php");
echo _("Hello World!");
?>
C: \ WAMP \ WWW \ PHP Test \ localization.php:
<?php
$locale = "de_DE";
if (isSet($_GET["locale"])) $locale = $_GET["locale"];
putenv("LC_ALL=$locale");
setlocale(LC_ALL, $locale);
bindtextdomain("messages", "./locale");
textdomain("messages");
?>
C: \ WAMP \ WWW \ PHP test \ locales \ de_DE \ LC_MESSAGES \ messages.po:
msgid ""
msgstr ""
"Project-Id-Version: \n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2010-02-14 00:35+0800\n"
"PO-Revision-Date: 2010-02-14 00:37+0800\n"
"Last-Translator: Jano Chen <weedcl@hotmail.com>\n"
"Language-Team: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Poedit-KeywordsList: _;gettext;gettext_noop\n"
"X-Poedit-Basepath: C:\\wamp\\www\\php-test\n"
"X-Poedit-Language: German\n"
"X-Poedit-Country: GERMANY\n"
"X-Poedit-SourceCharset: iso-8859-1\n"
"X-Poedit-SearchPath-0: .\n"
msgid "Hello World!"
msgstr "Hallo Welt!"
C: \ WAMP \ WWW \ PHP test \ locale \ de_DE \ LC_MESSAGES \ messages.mo
(sorry, for some reason I cannot copy the text of this file)

When I open it should display "Hallo Welt" (Hello World in German), but instead it displays it in English (Hello World).
Any suggestions?
PS: Windows XP SP2