I found two ".htaccess" files, one is located in '/httpdocs/.htaccess', another one is located in '/httpdocs/wordpress/.htaccess', the content is different, is it normal?
The Wordpress was installed on '/wordpress/' dir, then never changed, but when users go to my site, the URL shows "http://www.mydomain.com", no 'wordpress' shown on the URL.
Also, from Settings > General:
WordPress Address (URL): http://www.mydomain.com/wordpress
Site Address (URL): http://www.mydomain.com