WAMP：在虚拟主机中设置/ home / ... / public_html /

OK, so I've set up a virtual host in WAMP and it's working absolutely fine - I go to the hostname and it indeed goes to the right place, but the PHP script is trying to include a file from /home/*hostname*/public_html/(etc...) and failing, as it should be trying to include (etc...) directly, from the working directory.

My question is simple, yet I couldn't find anything online where someone else had the same problem, but how do I replace /home/*hostname*/public_html/ with / or otherwise ensure that /home/*hostname/public_html will always load from a directory I specify? I tried a RewriteRule but it didn't seem to have any effect...

Here's the httpd-vhosts.conf file which I'm sure is where the fix needs to be applied...

<VirtualHost *:80>
ServerAlias mysite
ServerName mysite
DocumentRoot "c:/wamp/www/mysite/"
<Directory  "c:/wamp/www/mysite">
    AllowOverride all
    Order Allow,Deny
    Allow from all
    Require local

    #RewriteEngine On
    #RewriteRule ^/home/mysite/public_html/(.*)/$  /$1
</Directory>
</VirtualHost>

EDIT: Ok, this is new to me as it's a clients website that I've just started trying to work on, and I've figured out it is using 'OpenCart' and that there is a config.php file I can edit to fix this. Still, I would appreciate knowing why my attempt to bypass this wouldn't work (it will be more convenient to leave the config.php file un-edited).