404 step 1

.htaccess

@@ -1,5 +1,7 @@
+ErrorDocument 404 /404.php
 RewriteEngine on
 RewriteBase /
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME}.php -f
 RewriteRule ^(.*)$ $1.php

404.php

@@ -0,0 +1 @@
+404 Page not found!