This version of Windows is for the IA-64 (Itanium Processor), they are build for High-Performance and Enterprise Servers.
Although this version includes the regular Windows Interface and shares the same codebase as the 32-Bit version, it lacks any support to run MS-DOS and Win16 Applications. 32-Bit Applications are run in real-time, although it runs slower.
Microsoft only released this version in 2 languages (English / Japanese) but you can install others with a MUI Pack onto the English Language version.
This version of Windows is often confused with Windows XP x64 Professional, which runs on AMD64 processors.
MD5 MUI Pack