XnView Software

so is there anyway to convert them in 32bits in batch processing tool? i can only find an "add alpha channel" method but it only replace alpha channel

when resizing a 8 bit png image file with alpha channel with most arithmetic (except nearest neighbour and bilinear), the image is converted to an 24 bit true colour picture and the alpha channel is lost

btw, is there any way to convert a 8 bit png image to 32 bit(keeping alpha channel) in batch ...