Windows XP 64bit was a… oddball operating system, it wasn’t just Windows XP but 64bit, there were notable technical differences between 32bit and 64bit Windows XP that can hinder software compatibility (Plus driver support wasn’t that particularly good for the 64bit version either).
Windows Vista was when the 64bit version was essentially the 32bit version but 64bit. ie: they’re no longer significantly different.
Right,