Fill the image to the entire window ?

[navmesh]

Hi, i want to "fit window to image" (fill the window with image) ,it 's the opposite of "fit image to window"
i mean when the image size is different from windows size, :

with a 4:3 image and the window size is 16:10 ,xnviewMp will do "fit image to window width"
with a 16:9 image and the window size is 16:10 ,xnviewMp will do "fit image to window height"

(This will fill the image to the entire window ,so we will never see background in this mode)

i 've tried all mode in "auto image size" but i haven't found any like this
is it possible ? Thanks