https://bz.apache.org/bugzilla/show_bug.cgi?id=66029

--- Comment #16 from Axel Howind <[email protected]> ---
The result of analysis is that this is not a bug in POI. The files you attached
are both valid Excel files and can both be opened without problems using
original MS Excel.

You have yourself hinted at the apparent cause of the incompatibility with your
software: apparently your detection algorithm relies on an undocumented
implementation detail, that is the order of zip file entries. That order has
been changed to *increase* compatibility with third party software
(https://bz.apache.org/bugzilla/show_bug.cgi?id=59747). We will not revert that
change as that would mean introducing an incompatibility with a widely used
tool for file detection.

As has been stated before, the correct approach is to fix the detection
algorithm that you are using. As you cannot share the code with us, there is
nothing more we can do for you. If you rely on some external library for the
detection, please open an issue with that library. If the detection algorithm
is developed by your company, you have to fix it yourself. You should be able
to get help on stack overflow, but people there will probably request to see
your current code as well.

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