My bad …
After many waste of time to find the culprit, i finally found it … : me !
Why ?
Because i realized many many MANY tests (upload task, download task) to create my best-dream-universal-win7x64-image …
So … i simply forgot to disable FOG service BEFORE ran sysprep on the Golden Image … (did it in the small test image)
Now, the Sysprep works fine …
But now, i know all sysprep logs … :
cbs.log
setup.etl
session.xml
setupact.log in Windows folder
setupact.log in Windows\Panther folder
setupact.log in Windows\Panther\unattendGC folder
setupapt.dev in Windows\inf
setupapt.offline in Windows\inf
setuperr in Windows\Panther …
Shame on me !