RewriteBase works incorrect

RewriteBase works incorrect, don't know why.

I have web-site in www/folder/ directory.
But document_root is www here.

I added this code to www/.htaccess:

Options +FollowSymLinks +ExecCGI

RewriteEngine On
RewriteBase /folder/

Code (markup):

In this case website works like with RewriteBase /. That is strange.

Here is my httpd.conf

<Directory />
    Options Indexes FollowSymLinks
    AllowOverride All
    Order allow,deny
    Allow from all
</Directory>

Code (markup):

httpd-vhosts.conf

 <VirtualHost 127.0.0.1:80>
        DocumentRoot D:/localhost/www
        ServerName site.ru
        ServerAlias www.site.ru
        ErrorLog D:/localhost/www/error.log
        CustomLog D:/localhost/www/access.log common
        
        <Directory "D:/localhost/www">
            Options Indexes FollowSymLinks
            AllowOverride All
            Order allow,deny
            Allow from all
        </Directory>
</VirtualHost>

Code (markup):

Also I've tried to restart apache without directory in virtualhost. - got the same.

What is going on here? Why it doesn't work?

Plz, help