Thanks, Aristotle. I've long since lost my pointer to a list of valid content types. I posted what I last remembered seeing which was likely a long time ago before PNG files were popular.

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print map { my ($m)=1<<hex($_)&11?' ':'';
$m.=substr('AHJPacehklnorstu',hex($_),1) }
split //,'2fde0abe76c36c914586c';
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