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Remove outdated info #45629

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20 changes: 8 additions & 12 deletions docs/framework/64-bit-apps.md
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Expand Up @@ -6,7 +6,6 @@ helpviewer_keywords:
- "applications [C++], 64-bit"
- "64-bit applications [C++]"
- "64-bit programming [C++]"
ms.assetid: fd4026bc-2c3d-4b27-86dc-ec5e96018181
---
# 64-bit applications

Expand All @@ -16,12 +15,10 @@ When you compile an application, you can specify that it should run on a Windows

32-bit applications that are built on .NET Framework 4 or later versions run under WOW64 on 64-bit systems.

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. (Because Visual Studio is a 32-bit application, when it is installed on a 64-bit system, it runs under WOW64.)

> [!NOTE]
> Because of the design of x86 emulation and the WOW64 subsystem for the Itanium processor family, applications are restricted to execution on one processor. These factors reduce the performance and scalability of 32-bit .NET Framework applications that run on Itanium-based systems. We recommend that you use the .NET Framework 4, which includes native 64-bit support for Itanium-based systems, for increased performance and scalability.
> Because of the design of x86 emulation and the WOW64 subsystem for the Itanium processor family, applications are restricted to execution on one processor. These factors reduce the performance and scalability of 32-bit .NET applications that run on Itanium-based systems. We recommend that you use .NET Framework 4 or later, which includes native 64-bit support for Itanium-based systems, for increased performance and scalability.

By default, when you run a 64-bit managed application on a 64-bit Windows operating system, you can create an object of no more than 2 gigabytes (GB). However, in .NET Framework 4.5, you can increase this limit. For more information, see the [\<gcAllowVeryLargeObjects> element](./configure-apps/file-schema/runtime/gcallowverylargeobjects-element.md).
By default, when you run a 64-bit managed application on a 64-bit Windows operating system, you can create an object of no more than 2 gigabytes (GB). However, in .NET Framework 4.5 and later, you can increase this limit. For more information, see the [\<gcAllowVeryLargeObjects> element](./configure-apps/file-schema/runtime/gcallowverylargeobjects-element.md).

Many assemblies run identically on both the 32-bit CLR and the 64-bit CLR. However, some programs may behave differently, depending on the CLR, if they contain one or more of the following:

Expand All @@ -37,18 +34,17 @@ When you compile an application, you can specify that it should run on a Windows
For general information about 64-bit programming, see the following documents:

- In the Windows SDK documentation, see [Programming Guide for 64-bit Windows](/windows/win32/winprog64/programming-guide-for-64-bit-windows).

- For information about Visual Studio support for creating 64-bit applications, see [Visual Studio IDE 64-Bit Support](/visualstudio/ide/visual-studio-ide-64-bit-support).

## Compiler Support for Creating 64-Bit Applications

By default, when you use the .NET Framework to build an application on either a 32-bit or a 64-bit computer, the application will run on a 64-bit computer as a native application (that is, not under WOW64). The following table lists documents that explain how to use Visual Studio compilers to create 64-bit applications that will run as native, under WOW64, or both.
By default, when you use .NET to build an application on either a 32-bit or a 64-bit computer, the application will run on a 64-bit computer as a native application (that is, not under WOW64). The following table lists documents that explain how to use Visual Studio compilers to create 64-bit applications that will run as native, under WOW64, or both.

|Compiler|Compiler option|
|--------------|---------------------|
|Visual Basic|[-platform (Visual Basic)](../visual-basic/reference/command-line-compiler/platform.md)|
|Visual C#|[-platform (C# Compiler Options)](../csharp/language-reference/compiler-options/output.md#platformtarget)|
|Visual C++|You can create platform-agnostic, common intermediate language (CIL) applications by using **/clr:safe**. For more information, see [-clr (Common Language Runtime Compilation)](/cpp/build/reference/clr-common-language-runtime-compilation).<br /><br /> Visual C++ includes a separate compiler for each 64-bit operating system. For more information about how to use Visual C++ to create native applications that run on a 64-bit Windows operating system, see [64-bit Programming](/cpp/build/configuring-programs-for-64-bit-visual-cpp).|
| Compiler | Compiler option |
|--------------|-----------------------------------------------------------------------------------------|
| Visual Basic | [-platform (Visual Basic)](../visual-basic/reference/command-line-compiler/platform.md) |
| Visual C# | [-platform (C# Compiler Options)](../csharp/language-reference/compiler-options/output.md#platformtarget) |
| Visual C++ | You can create platform-agnostic, common intermediate language (CIL) applications by using **/clr:safe**. For more information, see [-clr (Common Language Runtime Compilation)](/cpp/build/reference/clr-common-language-runtime-compilation).<br /><br /> Visual C++ includes a separate compiler for each 64-bit operating system. For more information about how to use Visual C++ to create native applications that run on a 64-bit Windows operating system, see [64-bit Programming](/cpp/build/configuring-programs-for-64-bit-visual-cpp). |

## Determining the Status of an .exe File or .dll File

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