https://bugs.documentfoundation.org/show_bug.cgi?id=163384
--- Comment #7 from Martin Leiblinger <[email protected]> --- I also investigated the problem, and I am pretty sure there are no loopholes in the mentioned Excel file, but there is an issue that the data descriptor in the ZIP file should look like this: 4.3.9 Data descriptor (https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT) compressed size 4 bytes uncompressed size 4 bytes However, in the corrupted file, they are actually stored in 8 bytes, as is typical in the ZIP64 format. When I modified this line https://github.com/LibreOffice/core/blob/master/package/source/zipapi/ZipFile.cxx#L1077 to always true, I was able to open the mentioned Excel file in LibreOffice without errors. I also tried to create a standard ZIP64 package using the commons-compress library, but that fails as corrupted in MS Excel :( So It seems that Excel uses a non-standard implementation of ZIP64, according to this article https://rzymek.github.io/post/excel-zip64/ -- You are receiving this mail because: You are the assignee for the bug.
