Add the following to your theme's functions.php to make all WooCommerce Product Documents links open in a new window/tab http://www.woothemes.com/products/product-documents/

wc-product-documents-new-window-link.php

<?php

add_filter( 'wc_product_documents_link_target', 'wc_product_documents_open_link_in_new_window', 10, 4 );

/**
 * Opens all product documents links in new window/tabs
 */
function wc_product_documents_open_link_in_new_window( $target, $product, $section, $document ) {
	return '_blank';
}

I have installed the code in the functions.php file. I am not seeing the behavior the code is supposed to provide. Is there a specific location in the file it needs to go. Can you give me a little more detail about this code?

Thanks
Phil

Sorry, we actually don't get alerts for comments left here so we had no idea you had trouble with this. I just tested with the latest version of Product Documents, and simply putting this code at the bottom of the current theme's functions.php file did the trick. Hopefully you've already gotten this working!