64-bit Edition was for computers that ran on Intel's 64-bit Itanium platform. This should not be confused with "Windows XP x64 Edition", as x64 and Itanium are completely different architectures. Unlike Windows XP x64 Edition, 64-bit Edition has fewer features than Windows XP Professional. Some of these features included NTVDM and Windows on Windows, which means that 16-bit MS-DOS applications will not be able to run. It also was missing Windows Media Player features, but Windows XP 64-bit Edition Version 2003, released on March 2003, added back these media features.