Separate PHP files show up as a 404

Hi there,

I’ve installed WordPress and recently used MU to enable me to make a few more sites without having to do fresh installs all the time.

However,
I’ve now I am trying to build a separate folder on my server, called scripts, so I can test a few php scripts I have made.
However, when I try and open those scripts, the wordpress 404 page takes over and says it can’t find this.
I know it has something to do with permalinks and my .htaccess file… but I’ve no idea how to fix it.
Any help?
Below is my .htaccess file…

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]
</IfModule>
# END WordPress