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Check the target of a .NET assembly


So you have a .NET dll and you want to know the platform it is built for. That is, you want to check whether the .NET dll was targeted for either

  • x86 (32 Bit only)
  • x64 (64 Bit only)
  • Any CPU (both 32 and 64 bit)

The easiest way to do this is to use corflags.exe which is supplied with the Microsoft Windows SDK. You can get the Windows 7 SDK from here
http://www.microsoft.com/en-us/download/details.aspx?id=8279#overview

Command Line to determine platform

1. Locate where CorFlags.exe is. Generally this would be under <ProgramFiles>\Microsoft SDKs\Windows\<version>\Bin\CorFlags.exe
2. Run CorFlags.exe <Full_Path_To_Assembly>. E.g. CorFlags.exe c:\test\test.dll
3. You will see an output like the following

S:\r862\sp1\work\pcdm\std\cms>corflags c:\test\test.dll
Microsoft (R) .NET Framework CorFlags Conversion Tool.  Version  3.5.21022.8
Copyright (c) Microsoft Corporation.  All rights reserved.

 Version   : v2.0.50727
CLR Header: 2.5
PE        : PE32
CorFlags  : 11
ILONLY    : 1
32BIT     : 1
Signed    : 1

To determine the platform of the dll, use the following cheat sheet

x86 : PE=PE32 and 32BIT=1

x64: PE=PE32+ and 32BIT=0

Any CPU: PE=PE32 and 32BIT=0

The signed flag indicates whether the assembly is signed or not.

If this article has helped you in some way, please feel free to leave a reply.


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