Little help from my friends with htaccess for AS3 file

Here is my htaccess file:

Code:

---

RewriteEngine On
RewriteCond %{HTTP_HOST} ^(.*\.)*mydomain.com$ [NC]
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^(.*)$ https://www.mydomain.com$1 [R]

---

I would like to make ONLY a folder https protected, not the entire site.
How would i do it? Which changes do i need?
Making my entire site https makes, looks like, my flash file too big!

Thanks,
Regards,
Leo.

Moved to Scripting & Backend forum.