I've come across this ISO image file (3.4GB), which is detected as MIME type text/plain instead of application/x-cd-image: http://distfiles.gentoo.org/releases/x86/12.0/livedvd-x86-amd64-32ul-2012.iso $ kmimetypefinder5 livedvd-x86-amd64-32ul-2012.iso text/plain
*** This bug has been marked as a duplicate of bug 80877 ***
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