NET Framework applications that run on Itanium-based systems. These factors reduce the performance and scalability of 32-bit. (Because Visual Studio is a 32-bit application, when it is installed on a 64-bit system, it runs under WOW64.)īecause of the design of x86 emulation and the WOW64 subsystem for the Itanium processor family, applications are restricted to execution on one processor. Visual Studio installs the 32-bit version of the CLR on an x86 computer, and both the 32-bit version and the appropriate 64-bit version of the CLR on a 64-bit Windows computer. NET Framework 4 or later versions also run under WOW64 on 64-bit systems. 32-bit applications that are built on the. NET Framework 1.0 or 1.1 are treated as 32-bit applications on a 64-bit operating system and are always executed under WOW64 and the 32-bit common language runtime (CLR). 64-bit Applications on WindowsĪll applications that are built on the. WOW64 is included in all 64-bit versions of the Windows operating system. WOW64 is a compatibility environment that enables a 32-bit application to run on a 64-bit system. When you compile an application, you can specify that it should run on a Windows 64-bit operating system either as a native application or under WOW64 (Windows 32-bit on Windows 64-bit).
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