插件面板中没有显示WMP插件？

我刚下载了WMD Editor plugin.
由于某种原因，没有显示在Plugins 菜单

文件夹被调用wmd-editor/

wmd-editor.php:

<?php
/*
Plugin Name: WMD Editor
Plugin URI: http://c.hadcoleman.com/wordpress/wmd-editor
Description: Adds the <a href="http://wmd-editor.com/">WMD Editor</a> to the comment field, to make life easier for your commenters.
Version: 1.0
Author: Chad Coleman
Author URI: http://c.hadcoleman.com
 */

/*
This is a simple plugin that just adds the javascript call to the header of your template. You can gather more info on this project at http://code.google.com/p/wmd/
*/ 

    // function for head output sytles
    function wmd_header() {
        global $cb_path;
        $cb_path = get_bloginfo(\'wpurl\')."/wp-content/plugins/wmd-editor";  //URL to the plugin directory
        $hHead = "\\n"."<!-- Start WMD Editor -->"."\\n";
        $hHead .= " <script language=\\"javascript\\" type=\\"text/javascript\\" src=\\"{$cb_path}/wmd.js\\" ></script>\\n";
        $hHead .= "<!-- End WMD Editor -->"."\\n";
        print($hHead);
    }

    add_action(\'wp_head\', \'wmd_header\'); ?>

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