https://bz.apache.org/bugzilla/show_bug.cgi?id=61275

--- Comment #12 from Stefan Bodewig <[email protected]> ---
I started looking through the archives in a hex-editor and the first local file
headers looked fine, so I skipped to the end.

While Results_good.xlsx ends with the "end of central directory" record one
would expect, the Results_bad.xlsx contains some garbage after it, namely

Error 500: java.lang.IllegalStateException\r\n

so it seems some log output has made it into the stream.

Usually ZIP archivers will read an archive from the back looking for the EOCD
record (or its ZIP64 cousin) and ignore garbage at the end. It is not uncommon
to find code for self-extracting archives there. This is why zip and friends
won't complain about the archive, Excel seems to be more picky.

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