php - Friendly URL within a directory

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I have a Wordpress
installation in a domain and within a directory, I have a site developed in PHP+MySQL
completely independent of the wordpress. It works alone. This site is a backoffice, so
it's installed under the /backoffice/
directory.

One of the directories of the
backoffice I have another directory I want it works with friendly
URL's.

In my .htaccess I have the following
rules:

            mod_rewrite.c>
RewriteEngine On
RewriteBase
            /


RewriteRule ^backoffice/edit_user/([^/\.]+)/?$
            /backoffice/edit_user/index.php?o=$1
            [L,NC,QSA]


RewriteRule ^index\.php$ -
            [L]
RewriteCond %{REQUEST_URI} !=/server-status
RewriteCond
            %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME}
            !-d
RewriteRule . /index.php [L]
RewriteRule ^login/?$ wp-login.php
            [QSA,L]

RewriteRule ^postpass/?$ wp-login.php?action=postpass
            [QSA,L]
RewriteRule ^logout/?$ wp-login.php?action=logout
            [QSA,L]
RewriteRule ^lostpassword/?$ wp-login.php?action=lostpassword
            [QSA,L]
RewriteRule ^retrievepassword/?$ wp-login.php?action=retrievepassword
            [QSA,L]
RewriteRule ^resetpass/?$ wp-login.php?action=resetpass
            [QSA,L]
RewriteRule ^rp/?$ wp-login.php?action=rp
            [QSA,L]
RewriteRule ^register/?$ wp-login.php?action=register
            [QSA,L]

When
invoked a url like this one: mydomain.com/backoffice/edit_user/joseantonio the 404 page
come up.

What's
wrong?

Thanks in advance.

Answer

Finally, I could find the
solution:

Here is the code used in conjuntion
with the wordpress:

            
RewriteEngine On
RewriteBase
            /

RewriteRule ^index\.php$ - [L]

**RewriteRule
            ^backoffice/edit_user/([^/\.]+)/?$ /backoffice/edit_user/index.php?o=$1
            [L,NC,QSA]**

 RewriteCond %{REQUEST_URI}
            !=/server-status

 RewriteCond %{REQUEST_FILENAME} !-f

            RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule . /index.php [L]

            RewriteRule ^login/?$ wp-login.php [QSA,L]
 RewriteRule ^postpass/?$
            wp-login.php?action=postpass [QSA,L]
 RewriteRule ^logout/?$
            wp-login.php?action=logout [QSA,L]
 RewriteRule ^lostpassword/?$
            wp-login.php?action=lostpassword [QSA,L]
 RewriteRule ^retrievepassword/?$
            wp-login.php?action=retrievepassword [QSA,L]
 RewriteRule ^resetpass/?$
            wp-login.php?action=resetpass [QSA,L]
 RewriteRule ^rp/?$
            wp-login.php?action=rp [QSA,L]

 RewriteRule ^register/?$
            wp-login.php?action=register
            [QSA,L]

As you can
see, I changed the position of my rule after the index.php rule, works fine, in any
other position, it will not work.