al_set_standard_file_interface - Allegro 5 API

       Set  the  ALLEGRO_FILE_INTERFACE(3alleg5) table to the default, for the calling thread.  This will change
       the handler for later calls to al_fopen(3alleg5).

       al_set_standard_file_interface - Allegro 5 API

al_set_new_file_interface(3alleg5)

Allegro reference manual                                                 al_set_standard_file_interface(3alleg5)

              #include <allegro5/allegro.h>

              void al_set_standard_file_interface(void)