<IfModule mod_rewrite.c>
Options +FollowSymLinks -MultiViews

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^windows/([^/]+)/?$ /windows/ct.php?ct=$1 [L]
</IfModule>