add the following line for each of your additional vhost:
127.0.0.1 myvhost.local
NameVirtualHost *
<VirtualHost *>
DocumentRoot "C:\xampp\htdocs"
ServerName localhost
</VirtualHost>
<VirtualHost *>
DocumentRoot "C:/Users/xxx/any/path/to/your/www/"
ServerName myvhost.local
<Directory "C:/Users/xxx/any/path/to/your/www/">
AllowOverride All # Allows to read local .htaccess
Options FollowSymLinks
Order allow,deny
Allow from all
Require all granted
</Directory>
</VirtualHost>