Windows XP Professional x64 Edition

Microsoft Windows XP Professional x64 Edition, release on April 25, 2005, is an edition of Windows XP for x86-64 personal computers. It is designed to use the expanded 64-bit memory provided by the x86-64 architecture.
Windows XP Professional x64 Edition is not be confused name "Windows XP 64-Bit Edition". There another name was pubilshed in Windows XP Professional x64 Edition included with "Windows XP 64-Bit Edition for 64-Bit Extended System".