Include don't Loading have Variables Path

[Nginx fans]

    server {
        listen       80;
        server_name  localhost;

        charset utf-8;

        location / {
        set $web_root d:/website/wordpress;
            root   $web_root;
            index  index.html index.htm index.php;
        }

        error_page  404              /404.html;

         redirect server error pages to the static page /50x.html

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   $web_root;
        }

        location ~ \.php$ {
            root           $web_root;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME
$web_root$fastcgi_script_name;
            include        fastcgi_params;
        }

     include    $web_root/.htaccess;

    }


###
 include    $web_root/.htaccess; This is load Rewrite Rule for nginx
But Nginx don't load why?

[emerg]: CreateFile() "D:\nginx/conf/$web_root\.htaccess" failed (3: The
system cannot find the path specified) in D:\nginx/conf/nginx.conf:42


How should I do? How do NGINX make it support.
please thanks.
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