Hi ludo974
This is due to your server configuration , you can manage it via .htaccess file
Take a look HERE for .htaccess examples
You should add in your/NOUVEAUSITE/.htaccess file the instructions to not redirect the urls to your public_html
#Redirect to www location with subdirectory
RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_HOST} domain.com [NC]
RewriteRule ^(.*)$ http://www.domain.com/directory/index.html [R=301,NC]
Regards