Hi,
The product layout is loaded by the view "product / show".
$this->setLayout($this->productlayout);
echo $this->loadTemplate();
The variable $this->productlayout is initialized in the view.html.php from the product settings and the HikaShop configuration.
Because it is possible to override the product layout per product and per category.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.