Auto create a .htaccess file when user created ???

[mrcancel]

I want to enable hotlink protect for all my user on server ! I try create a .htaccess file on default folder be low :

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://|DOMAIN|/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^http://|DOMAIN|$      [NC]
RewriteCond %{HTTP_REFERER} !^http://www.|DOMAIN|/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^http://www.|DOMAIN|$      [NC]
RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ - [F,NC]

But when i created a user, it will not work for passing |DOMAIN|...
How to do it ???