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I have also noticed this when downloading epubs from the MobileRead Library with IE11. Typically when IE cannot securely identify an epub's file type from the server end doc-type and file sniffing it will give the file the safe extension of .zip (epubs being zips, of course) and I don't recall coming across it giving them a .php extention before.
As you say, it also changes the file name to "attachment" so all epub files from MR Library become attachment.php which seems to be extracted from the webpage link; however, if mobileread.com is added to IE11's compatability view list then epubs from there are named and downloaded correctly.
I don't know if this is some issue at the server end that IE11 is tougher on than earlier versions for security reasons, in which case I would have expected it to name epub files as .zips, or is just a glitch in IE11 or a matter at the server of a type that IE11 is designed to be intolerant of. (Chrome, for example, seems to not be affected)
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