Multiple Applications

[eluser]pickupman[/eluser]
@Greffer

Is you application folder actually applications or is that a typo? It should be application unless you have changed this in your index.php. Do the URL's work when you use .php?

Two other things to check.
1. Is mod_rewrite/.htaccess enabled or allowed for your server? Can you rewrite other urls? Try writing something explicit.
2. Try changing the last line of the RewriteRule to include a question mark as some server environments need it.

Code:

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