XnView Software

am i the only one with this problem?
i tried png converted by xnview (in case of 3DS implementation of PNG were non standard), i see the mask (Preview/ShowMask) but i cant extract it!
i have a grayscale image, ok, but this is not the mask, it's the source image...without colors...

yes, i know, but my image come from 3DS and the Alpha cannel is the outline of this object (a mask). and my result image is like a RGB to grayscale transformation in photoshop.

en français, c'est bien aussi, si je ne me fait pas remonter les bretelles par l'e modérateur :
je sais bien ce qu'est un ...

For me, this script produce a gray version of my image, not the mask.
i use the latest vesion.
désolé