> It is not really necessary to compute the second checksum. Just set the
>16 bytes to binary zeroes and the save file will be accepted as valid.

The second checksum is necessary, otherwise the write record operation on
the final save file record fails with CPF4525, even when binary zeros.

CPF5175 = invalid 12-byte record checksum
CPF4525 = invalid 16-byte file checksum

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