I've run into a couple of cases where the file was a .CBR (RAR) or .CB7 (7Zip) archive not a .ZIP archive. And one case where the creator of the file wanted to save every byte they could so they used 7Zip to generate the .cbz file using a 3840MB dictionary with LZMA Ultra compression ZIP format archive. They saved 8MB on a 381MB file but since the file needed 3842MB of memory for the dictionary, it wouldn't open on any eInk device I had access to.
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