THis was asked and answered a few weeks ago, but I've discovered that there is no "wp_shopping_cart.php" file in the plugin folder I gave. A subsequent answer related to carts, not bur now buttons.
I found a form element in the "eStore_misc_functions.php" file that seemed to related to a Paypal Buy Now button. I added the "target" tag to that form element, but when tested, it did not open a new window.
In which file can I add the "target="_blank" tag?