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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Visual Studio 64-bit Components

Visual Studio provides 64-bit versions of some components, and also provides tools that are specific to 64-bit development.

The runtime setup for 64-bit operating systems includes both the 32-bit and 64-bit common language runtime (CLR). You do not have to install a separate 64-bit-specific framework after you install Visual Studio.

Visual C++ gives the option of installing the x64 compiler and tools on Windows 64-bit computers, and also the option of installing 64-bit runtime .dlls, such as msvcr80.dll, msvcm80.dll, and msvcp80.dll. To install these components, perform a full installation or, during a Custom installation, select the x64 Compilers and Tools check boxes. For more information about the compilers, see How to: Enable a 64-Bit Visual C++ Toolset at the Command Line.

Visual Studio uses the 32-bit cross compiler even on a Windows 64-bit computer. However, you can use devenv commands to create a command-line environment to call 64-bit-hosted tools.

The Visual Studio 2008 debugger lets you debug 64-bit applications on a local or a remote computer. When you are debugging on a local computer, Visual Studio is running under Windows-32-bit-On-Windows-64-bit (WOW64) and the application is running on Windows 64-bit.

Before you can debug a 64-bit application that is running on a remote computer, you must install the 64-bit remote debugger on the remote computer. The 64-bit remote debugger can be found in the \Remote Debugger\ folder on installation disk 3 for English releases, installation disk 4 for non-English releases, or on the DVD.

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