I have a case of one machine out of several incorrectly reporting the MIME type of any image uploaded via a web form in Internet Explorer 11 only as 'application/....' rather than 'image/....' as on every other machine, or indeed either Chrome or Firefox on the same machine. This is breaking a web application which only allows uploading of 'image/...' MIME types.
My first guess was maybe the application associated with the files could be the culprit, but changing this did not make a difference. Other things tried have been restarting the machine, and also resetting the browsers settings.
This machine is using Windows 7, but perhaps this happens on other releases too.
Does anyone have any ideas on both how to change this to the standard MIME type, and also what may have caused this in the first place?