Erweiterung III » Icons for Win Vista

Hi,
My programs creates the icon file and my question is: Which icons must write as PNG file format?

all 32-bit images or only icons size greater than 256?

because icons can be 32bit even in Bitmap format!

Please help.
Thanks!
I didn't find the right solution from the Internet.
References:https://social.msdn.microsoft.com/Forums...ista?forum=vsga

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