copy /B [image.jpg] + [file] [new.jpg]
/B” is for binary. By adding this mark, you append [file] binary mode to the end of the new JPG.
a jpg viewer will only read the length indicated in the file header and ignore the rest, displaying the file as normal. By appending the extra data, the jpg's new file size will be the sum of the original jpg and the new file appended to it.
from:webfreebies4u.boggspot.com
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