hmm. it's humorous, but not true.
A lot of people seem to think that XP somehow traces its lineage back to 1985 and to DOS in 1981. it doesn't. It only goes back to like 1987. Windows XP is built on NT, which, in turn, grew from OS/2 which was a completely new codebase. XP's family tree is 32-bit, always has been, and for the forseeable future, will be (I don't see x86 making the 64-bit leap, even with Hammer)