I ve got the solution !
There is a problem with the .zip file on github it’s not compatible with windows extract …
First i use 7zip to unzip the downloaded file poppy-torso-xu4-2016-05-25.img.zip
Then you can use etcher to programm the SDcard or eMMC.with the unzipped file poppy-torso-xu4-2016-05-25.img
Damien I send you all the explanation in french …I suggest to update the .zip file on github with a new one made on windows !
You can download it for a while the file
"poppy-torso-xu4-2016-05-25_win.img.zip" on adress http://dl.free.fr/iao3JWODx
This file will be delete after 30 days without download