When uploading a file (jpeg) via a form in IE7 I am seeing a mime-type of ‘image/pjpeg’ instead of ‘image/jpeg’ (as I see in Firefox or similar). It’s easy enough to work around this problem, but I’m just wondering why IE7 is behaving differently in this case?
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I believe it’s because the JPEG you’re working with is a progressive JPEG, which has a different mime-type.