clipboardData & PNG & JPG

[sims]

I am using the following to place a JPG onto the clipboard:

set the clipboardData["image"] to url ("binfile:"&tPhotoChoice)

When I paste the clipboard into another app it appears to paste
a PNG file which is much larger in k than the original JPG.

Is there any way to place the original JPG (and not a larger PNG)
onto the clipboard?

TIA

sims
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