Multiple Applications

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Thanks. I've changed my .htaccess to:

Code:

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^myfirstapp/(.*)$ myfirstapp.php/$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

and I've changed my config.php. However when I go to www.mysite.com/ci/myfirstapp/controller I get "404 Page Not Found. The page you requested was not found." but www.mysite.com/ci/myfirstapp.php/controller still works.

What am I doing wrong?