In products permalink (i think this is woocommerce), how do you add .html to the end of every URL? When I try to do it, it keeps adding a foward slash at the end. So it would be mysite.com/product/title.html/ instead of mysite.com/product/title.html

the reason I am doing this is, because I got a CMS, that has URL structures that end in .html. And there is 15000 urls. Coverting to WP, I do not want to redirect all those pages.