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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.
aggi
As the Excel security model is so crap this is also a great way to read data from files protected by a password. I've heard.