Enable autenthication only in IE

[James]

Hi,

I want to enable authentication only in IE. So I've tryed to put this in http.conf or htacces :

       RewriteEngine On
       Options +FollowSymLinks
       RewriteCond %{HTTP_USER_AGENT} ^.*MSIE.*$
       XXXXXXX

Where XXXXXXX should be :

       AuthName "A Protected Place"
       AuthType SSPI
       SSPIAuth On
       SSPIAuthoritative On
       SSPIPerRequestAuth Off
       require valid-user

I don't know the exact sintax of Apache conf files…. How can I do this?

Thanks!