The following topics describe the changes necessary to upgrade
    the level of support for ODS-5. Note that you must first ensure
    that the application meets the default support level before you
    can upgrade it to the full support level.

                                   NOTE

       If you are not using the RMS or QIO interfaces to perform
       disk I/O, the Extended File Specifications support level of
       your application depends on whether the interface you are
       using (such as a language run-time library) provides full
       support.