verdiğiniz kodları flash get geçebiliyor.
en iyi yol budur.
<Files *.php>
  Deny From All
</Files>

<Files *.txt>
  Deny From All
</Files>

<Files *.js>
  Deny From All
</Files>

<Files *.cgi>
  Deny From All
</Files>

<Files *.pl>
  Deny From All
</Files>