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CorFlags.exe (CorFlags Conversion Tool)

Updated: April 2011

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 and with the Windows SDK. To run the tool, we recommend that you use the Visual Studio Command Prompt or the Windows SDK Command Prompt (CMD Shell). These utilities enable you to run the tool easily, without navigating to the installation folder. For more information, see Visual Studio and Windows SDK Command Prompts.

  • If you have Visual Studio installed on your computer: On the taskbar, click Start, click All Programs, click Visual Studio, click Visual Studio Tools, and then click Visual Studio Command Prompt.

    -or-

    If you have the Windows SDK installed on your computer: On the taskbar, click Start, click All Programs, click the folder for the Windows SDK, and then click Command Prompt (or CMD Shell).

  • At the command prompt, type the following:

CorFlags.exe assembly [options]

Argument

Description

assembly

The name of the assembly for which to configure the CorFlags.

Option

Description

/32BIT+

Sets the 32BIT flag.

/32BIT-

Clears the 32BIT flag.

/?

Displays command syntax and options for the tool.

/Force

Forces an update even if the assembly is strong-named.

Important noteImportant
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.

NoteNote
Assemblies must have a CLR header version of 2.5 or greater to run natively.

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

Date

History

Reason

April 2011

Added information about using the Visual Studio and Windows SDK Command Prompts.

Information enhancement.

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