Difference between JPEG and JPG

What is the difference ebetween these two file formats and why does Aperture differentiate between them?

These file formats are essentially the same. Just the way the filename extension is written differs; a relic from the time when it was necessary to export to DOS systems (DOS only allowed three letter file name extensions and determined the MIME type from the extension).
MacOS X does not need the file name extension to determine the type of an image, so the way it is written does not matter. For example: Three different extensions, but the kind of the file is the same:
Regards
Léonie

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