In OpenCart 2.3 extension and language folder structures have changed. Backward compatibility with previous versions was added, but some pieces of the code are missing. This can have different unpleasant outcome with many extensions (e.g.: access/modify permission denied). This small VQMod adds missing pieces and allows you to use most extensions that have not been updated specifically for OpenCart 2.3.
As a small bonus it sorts extensions list by name instead of filename and adds back extension menu items like Modules, Payments, Shipping etc.