part_write_flags |= WIMLIB_WRITE_FLAG_USE_EXISTING_TOTALBYTES;
if (part_number != 1)
part_write_flags |= WIMLIB_WRITE_FLAG_NO_METADATA;
part_write_flags |= WIMLIB_WRITE_FLAG_USE_EXISTING_TOTALBYTES;
if (part_number != 1)
part_write_flags |= WIMLIB_WRITE_FLAG_NO_METADATA;