I used XP64 for a while. What killed it for me was that when XP service pack 3 came out, many programs started to require the new facilities it included, and so checked for SP3 being installed. XP64 had the same service pack, but because the 64bit XP had come out later than the 32bit version, it was called SP2, and so the programs requiring and checking for "SP3" would refuse to run even though the capability to run them was present!
Paul From: Aaron Hill <lilyp...@hillvisions.com> Microsoft did not "hold systems down". In the era of XP, Windows came in a 64-bit version, colloquially known as XP64. The main issue was that most consumers at that time only had access to 32-bit hardware, so it was not a priority to market 64-bit support.
