title: Change page layout of a magento page without editing core files
body: <p>I have read <a href="https://stackoverflow.com/questions/12190678/how-to-change-product-view-page-to-one-column-layout">how to change product view page to one column layout</a>, but is there any other way than this so that we do not have to edit the core files as on update these files will be overwritten.</p>