I have a file .htaccess with these RewriteRules:
RewriteEngine On
RewriteRule ^login$ login.php [L]
RewriteRule ^index$ index.php [L]
RewriteRule ^page/([^/]+)/?$ page.php?id=$1 [L,QSA]
It's possible to prevent direct access to all these files, but allow access only with RewriteRule
For example if someone call: "domain.com/login" should see the page.
But if someone call "domain.com/login.php" should not (in this case should see a 403 or 404 error)