What I wrote *is* easy to misinterpret, and you don't know me enough to be able to guess how I meant it.
...And emoticons help little in cases like that, regretably.
Now, the subject is really involved. You've ventured into one of the long-standing open problems about Vista and successors.
Dietmar has proven it's doable to boot Vista sp0 x86 from FAT-32. No one knows how good it's long-time stability is.
And nothing more is know about all other Vista+ OSes, except for the experiments Tripredacus has just performed.
I hope to be able to join the experimentation after Dec 20 or so. Before that I'll have to be content to provide suggestions and discuss results, but I won't be able to contribute any original experiments myself, although I'd much like to.
For now I have to say I keep betting the best way to copy the proble directories and files is XXCOPY, which is very powerful and up to date. IIRR it does have a x64 version