XMP Stamping fails on PNG in photoshop

Hi,
I am using Photoshop CS3 sdk for developing a plugin. I am supposed to add some metadata information in the PNG file. I do it using xmp sdk.
I can add information in the png file using xmp sdk.
But when i open the same PNG file in photoshop and save it with some modifications then photoshop wipes out the xmp information in the PNG file. So i am losing my metadata if user tries to modify the file in photoshop.
Can anybody help me in this regard.
Note : XMP stamping works fine for other image formats like JPEG, PSD.
Thanks in advance.

ohh....
Is ther any workaround to do the same. ??

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