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I think they had a big bump in the strength of their passworded files a few years ago. I remember a variety of the password cracking tools I had stopped working.
The zipping and unzipping is good for a variety of stuff. You can remove corrupt pivot tables or you can change the settings so that double clicking on a number from a pivot created by power pivot returns more than 1000 rows.
Is that a response to me, and does it actually work?
I'm not going to use it though, because I never want to be asked to look at this XLSX again.