jpeg - What is the difference between: image/x-citrix-pjpeg and image/pjpeg -

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some files uploaded reported mime type:

image/x-citrix-pjpeg

they valid jpeg files , accept them such.

i wondering however: why mime type different?
there difference in format? or mimetype invented light bulb @ citrix no apparent reason?

update:
ok, did more searching , testing on question, , turns out they're lying mime-type (never trust any info send client, know).
i've checked bunch of files different encodings (created libjpeg)

official mime type jpeg files: image/jpeg

but applications (most notably ms internet explores yahoo! mail) send jpeg files image/pjpeg

i thought knew pjpeg stood 'progressive' jpeg. turns out progressive/standard encoding has nothing it.

ms internet explorer send out all jpeg files pjpeg regardless of contents of file.

the same goes citrix: all jpeg files send citrix client reported image/x-citrix-pjpeg mime type.

the files untouched (identical before , after upload). turns out difference in mime type indication software used send file?

why people invent new mime type if there no differences file contents?


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