Admin > Categories/Products: File name missing from URL

[MarkTJ]

I have successfully transferred osCommerce customers, orders, products, etc. to my Zen Cart installation's database (v.1.3.8a). But when I'm in Admin > Categories/Products pages (...admin/categories.php...), in the Actions column for each product listed, each of these buttons - Edit, Delete, Move, Copy, and Meta Tags - is missing the name of the file but not the .php file extension.

Example: ...zencart/admin/.php?page=1&product_type=1&cPath=22&pID=...

I'm guessing the file needed is products.php? Why would that be missing? Interestingly, the Attribute Features URL is complete.

[MarkTJ]

I'm trying to figure out where the code is that generates these links... \admin\includes\modules\category_product_listing.php?