Compression method for xlsx with 7z?

For some strange reason, Microsoft is looking at the operating system encoding in the "version needed to extract" in the local file headers and central directory headers. It wants those to be zero, but 7z is setting them to 3 for Unix. If you are intent on using 7z, then you will need to patch the resulting file.

You could use system zip and unzip instead. I often use something like the following.

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