Download wow64.dll About wow64.dll errors. When an application requires wow64.dll, Windows will check the application and system folders for this.dll file. Oct 20, 2015 - Luckily, Windows comes with a handler that is specially built to enable compatibility with 32-bit apps, namely the WoW64 compatibility layer.

32-bit and 64-bit versions of Windows seem to throw a lot of people for loops. 64-bit versions of software can only be installed on 64-bit versions of Windows but 32-bit software can be installed on both 32-bit and 64-bit Windows (thanks to the WoW64 extensions that have really improved the experience since Windows XP 64). The “bit-ness” of Windows is actually summarizing a mathematical problem that is addressed by 64-bit Windows.

32 bits means Windows can address about 3.2 gigabytes of RAM (summarized as 4GB). If you have more RAM than 3.2GB and a 32-bit version of Windows installed, that extra RAM is being wasted. A bit is a placeholder and 32 bits means the field is 32 spaces long, like the ones place, tens place, hundreds place, and so on.

64-bit Windows gives the operating system much more RAM to work with (the OS actually controls the bottleneck more than the math now). Microsoft Office is a popular application and when given the option to download, for example with, you are given the since Office 2010.

Many people will look to see if their Windows is 32-bit or 64-bit and choose the matching version. While that is fine for most applications, Office is a rather complex product and Microsoft recommends the 32-bit version of Office in most cases. 32-bit Office is recommended for most users We recommend the 32-bit version of Office for most users, because it’s more compatible with most other applications, especially third-party add-ins. This is why the 32-bit version of Office 2013 is installed by default, even on 64-bit Windows operating systems. On these systems, the 32-bit Office client is supported as a Windows-32-on-Windows-64 (WOW64) installation.

WOW64 is the x86 emulator that enables 32-bit Windows-based applications to run seamlessly on 64-bit Windows systems. This lets users continue to use existing Microsoft ActiveX Controls and COM add-ins with 32-bit Office. If you uses third party add-ins, you may only be able to use the 32-bit Office and switching from 64-bit Office will require an uninstall and reinstall. TechNet lists these reasons to use the 64-bit Office. • Excel experts with complex worksheets • Project files over 2GB • In-house Office solution developers for testing • Security enhancement by default with hardware DEP (Data Execution Prevention). From my experience, that means most people are able to use the 32-bit version of Office and if you are able to use the 32-bit Office enterprise-wide, your developers do not need to test 64-bit Office cases.

Keeping the same solution across the enterprise makes deployment and updating simpler and more efficient.

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• • • • • • Before we start discussing the topic of developing 64-bit program code, let us speak about backward compatibility of 64-bit Windows versions, with 32-bit applications. Backward compatibility is arranged through the mechanisms implemented in. WoW64 (Windows-on-Windows 64-bit) is a subsystem of Windows operating system, which allows you to execute 32-bit applications on all the 64-bit versions of Windows. The WoW64 subsystem does not support the following programs: • programs compiled for 16-bit operating systems; • kernel-mode programs compiled for 32-bit operating systems. Indirect expenses Different processor architectures have a bit different WoW64.

For example, the 64-bit Windows version developed for Intel Itanium 2 processor, employs WoW64 to emulate instructions. This emulation is rather resource-intensive in comparison to WoW64 for architecture, because the system has to switch from the 64-bit mode to compatibility mode when executing 32-bit programs. WoW64 on Intel 64 (AMD64 / x64) does not require instruction emulation. In this case the WoW64 subsystem emulates only the 32-bit environment through an additional layer between a 32-bit application, and the 64-bit Windows API. In some places this layer is thin, in others a bit thicker. For an average program, you may expect 2% performance penalty because of this layer. For some programs, it can be larger.

Two per cent is not very much, but keep in mind that 32-bit applications work a bit slower under the 64-bit Windows than in the 32-bit environment. Compilation of 64-bit code does not only allow you to avoid using WoW64, but also gives you an additional performance gain. This is explained by architectural modifications in the microprocessor, such as an increased number of general-purpose registers. For an average program, you may expect a 5-15% performance gain after recompilation alone. Benefits of the 64-bit environment for 32-bit programs Because of the WoW64 layer, 32-bit programs are less efficient in the 64-bit environment than in their native 32-bit one. However, simple 32-bit applications can still get one benefit of being executed in the 64-bit environment. Maybe you know that a program built with the switch '/LARGEADDRESSAWARE:YES' can allocate up to 3 Gbytes of memory, if a 32-bit Windows is launched with the switch '/3gb'.