htaccess on WordPress 2.5.1

Hi,

I have a blog running the latest WordPress 2.5.1. Let's say it,s www.example.com/

Now, under this domain name, I have a subfolder with an application inside:
www.example.com/app/index.php

How can I edit the .htaccess to make the app's URL search engine friendly? For example:

www.example.com/app/run/193/keyword ->
www.example.com/app/index.php?action=run&id=193

(keyword is not needed in the script, I put it in the URL for search engine purposes only).

-----
My current .htaccess is more or less like this:-

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
-----

Thanks.

 

Think adding something like this would do a job...

RewriteRule ^/app/(.*)/([0-9]+)/?$ /app/index.php?action=$1&id=$2 [QSA,L]

 

Thanks. But it doesn't do the job... when I browsed the page using the SEO friendly URL, it displays the 404 page from WordPress.