редирект .htaccess (bitrix)

Подскажите, как настроить редирект всех страниц index.php с помощью htaccess, т.е., к примеру:

http://www.site.ru/about/index.php на http://www.site.ru/about/

Или другие варианты, сайт на Битриксе

Options -Indexes 

ErrorDocument 404 /404.php



<IfModule mod_php5.c>

  php_flag allow_call_time_pass_reference 1

  php_flag session.use_trans_sid off



  #php_value display_errors 1



  #php_value mbstring.func_overload 2

  #php_value mbstring.internal_encoding UTF-8

</IfModule>



<IfModule mod_rewrite.c>

  Options +FollowSymLinks

  RewriteEngine On

  RewriteBase /



  RewriteCond %{HTTP_HOST} ^site.ru

  RewriteRule (.*) http://www.site.ru/$1 [R=301,L]



  #RewriteRule ^/about/news2/$ http://www.site.ru/about/ [R=301,L]

  

  RewriteCond %{REQUEST_URI} ^(.*)/$ 

  RewriteRule .* - [L] 



  RewriteCond %{ENV:REDIRECT_STATUS} 200 

  RewriteRule .* - [L] 



  RewriteCond %{REQUEST_METHOD} =GET

  RewriteCond %{REQUEST_URI} ^(.*)/index.php$ 

  RewriteRule ^(.*)$ %1/ [R=301,L] 



  RewriteCond %{REQUEST_FILENAME} !-f

  RewriteCond %{REQUEST_FILENAME} !-l

  RewriteCond %{REQUEST_FILENAME} !-d

  RewriteCond %{REQUEST_FILENAME} !/bitrix/urlrewrite.php$

  RewriteRule ^(.*)$ /bitrix/urlrewrite.php [L]

  RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]

</IfModule>



<IfModule mod_dir.c>

  DirectoryIndex index.php index.html

</IfModule>



<IfModule mod_expires.c>

  ExpiresActive on

  ExpiresByType image/jpg "access 3 day"

  ExpiresByType image/jpeg "access 3 day"

  ExpiresByType image/gif "access 3 day"

  ExpiresByType image/png "access 3 day"

  ExpiresByType audio/mp3 "access 3 day"

  ExpiresByType audio/wav "access 3 day"

  ExpiresByType text/css "access 3 day"

  ExpiresByType application/pdf "access 3 day"

  ExpiresByType text/x-javascript "access 3 day"

  ExpiresByType application/x-shockwave-flash "access 3 day"

  ExpiresByType image/x-icon "access 3 day"

  ExpiresDefault "access 3 day"

</IfModule>