Thanks a lot!
But this does solve the problem only partially though I think.
How can I know that there is no malware inside my USB which copy itself automatically as a hidden file to my offline,
getting all the data and bringing it back to the online PC in a different hidden file or something when I think I am only coping the watch-only wallet?
Maybe I am paranoid but Armory has been here for quite a while, isn't it possible that this sort of malware exist?