I succeeded at the end! The image has to be of the whole disk, (to include MBR, stupid of me!).
I tried with a virtual disk and with a very small disk and is OK.
(I'm not and expert with WinImage, I downloaded it only to try this functionality with ImageBurn #39;( : there is a comand 'create Virtual Hard Disk from phisical drive ...' that does, I failed using 'ReadDisk' with a letter driver selected that copy only the partition )
but
this would be great, and much appreciated! (in next release?)
Thank you.