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title CorFlags.exe (CorFlags Conversion Tool)
ms.custom
ms.date 03/30/2017
ms.prod .net-framework
ms.reviewer
ms.suite
ms.technology
dotnet-clr
ms.tgt_pltfrm
ms.topic article
helpviewer_keywords
CorFlags conversion tool
CorFlags.exe
portable executable files, CorFlags section
ms.assetid ef900f8f-71ca-4dde-9b8c-95ddb0d7d89c
caps.latest.revision 17
author rpetrusha
ms.author ronpet
manager wpickett
ms.workload
dotnet

CorFlags.exe (CorFlags Conversion Tool)

The CorFlags Conversion tool allows you to configure the CorFlags section of the header of a portable executable image.

This tool is automatically installed with Visual Studio. To run the tool, use the Developer Command Prompt (or the Visual Studio Command Prompt in Windows 7). For more information, see Command Prompts.

At the command prompt, type the following:

Syntax

CorFlags.exe assembly [options]

Parameters

Required parameter Description
assembly The name of the assembly for which to configure the CorFlags.
Option Description
/32BIT[REQ]+ Sets the 32BITREQUIRED flag.
/32BIT[REQ]- Clears the 32BITREQUIRED flag.
/32BITPREF+ Sets the 32BITPREFERRED flag. The app runs as a 32-bit process even on 64-bit platforms. Set this flag only on EXE files. If the flag is set on a DLL, the DLL fails to load in 64-bit processes, and a xref:System.BadImageFormatException exception is thrown. An EXE file with this flag can be loaded into a 64-bit process.

New in the [!INCLUDEnet_v45].
/32BITPREF- Clears the 32BITPREFERRED flag.

New in the [!INCLUDEnet_v45].
/? Displays command syntax and options for the tool.
/Force Forces an update even if the assembly is strong-named. Important: If you update a strong-named assembly, you must sign it again before executing its code.
/help Displays command syntax and options for the tool.
/ILONLY+ Sets the ILONLY flag.
/ILONLY- Clears the ILONLY flag.
/nologo Suppresses the Microsoft startup banner display.
/RevertCLRHeader Reverts the CLR header version to 2.0.
/UpgradeCLRHeader Upgrades the CLR header version to 2.5. Note: Assemblies must have a CLR header version of 2.5 or greater to run natively.

Remarks

If no options are specified, the CorFlags Conversion tool displays the flags for the specified assembly.

See Also

Tools
64-bit Applications
Command Prompts