Set wp-content folder to Dropbox folder

You will need to create an alias to your Dropbox folder so those files can be accessed on your server. This can be done in httpd.conf:

Alias /dropbox /Users/seth/Dropbox

Or you could make a direct alias to the real wp-content folder:

Alias /wp-content /Users/seth/Dropbox/Xammp-Content/wordpress/wp-content/

Then set WP_CONTENT_URL in wp-config.php appropriately:

define( 'WP_CONTENT_URL', 'http://localhost/dropbox/Xammp-content/wordpress/wp-content' );