.htaccess & WordPress: Exclude folder from RewriteRule

Question

I have this .htaccess file in WordPress. It's located at /public_html/ (web root). I need to exclude a folder (csNewsAd) from the rewrite engine. I've tried this, based from another question similar here at SO, but didn't work at all.

AddHandler x-httpd-php5 .php
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^/csNewsAd($|/) - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Any suggestions?

More data

There's another .htaccess inside /csNewsAd for password protection:

AuthName "Clasificados"
AuthType "basic"
AuthUserFile /home/ig000192/public_html/csNewsAd/.passwd
Require valid-user

Answer 1

RewriteCond %{REQUEST_URI} !^/(csNewsAd|csNewsAd/.*)$ 

instead of

RewriteRule ^/csNewsAd($|/) - [L]