The C RTL provides support for compiling applications to use file
    sizes and offsets that are 2 GB and larger. This is accomplished
    by allowing file offsets of 64-bit integers.

    The fseeko and ftello functions, which have the same behavior
    as fseek and ftell, accept or return values of type off_t, which
    allows for a 64-bit variant of off_t to be used.

    C RTL functions lseek, mmap, ftuncate, truncate, stat, fstat, and
    ftw can also accommodate a 64-bit file offset.

    The new 64-bit interfaces can be selected at compile time by
    defining the _LARGEFILE feature macro.