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I would suggest that you test by opening zip files on your computer first, NOT in the browser until this works. If it works on the desktop, but broken in the browser, at least you will have narrowed down the problem. So, here are my suggested step to fix the problem on the desktop. Follow the instructions here to attempt restoring the file associations. ...


If your primary goal is compatibility with all/most OSs and unzipping tools, then Deflate is your best choice. From Wikipedia's Zip->Compression Methods article: The most commonly used compression method is DEFLATE, which is described in IETF RFC 1951.


Appears to be a bug in how Windows handles zip files created on a Mac, as explained by http://blogs.msdn.com/b/asklar/archive/2012/05/03/why-do-zip-files-from-mac-os-show-up-as-green-encrypted.aspx The problem happens when Windows gets confused about how to interpret file/folder attributes. In FAT/NTFS, these values are stored according to this ...

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