How to determine if a .NET assembly was built for x86 or x64?
I've got an arbitrary list of .NET assemblies.
I need to programmatically check if each DLL was built for x86 (as opposed to x64 or Any CPU). Is this possible?
Look at System.Reflection.AssemblyName.GetAssemblyName(string assemblyFile)
You can examine assembly metadata from the returned AssemblyName instance:
Using PowerShell :
[36] C:> [reflection.assemblyname]::GetAssemblyName("${pwd}Microsoft.GLEE.dll") | fl
Name : Microsoft.GLEE
Version : 1.0.0.0
CultureInfo :
CodeBase : file:///C:/projects/powershell/BuildAnalyzer/...
EscapedCodeBase : file:///C:/projects/powershell/BuildAnalyzer/...
ProcessorArchitecture : MSIL
Flags : PublicKey
HashAlgorithm : SHA1
VersionCompatibility : SameMachine
KeyPair :
FullName : Microsoft.GLEE, Version=1.0.0.0, Culture=neut...
Here, ProcessorArchitecture identifies target platform.
I'm using PowerShell in this example to call the method.
You can use the CorFlags CLI tool (for instance, C:Program FilesMicrosoft SDKsWindowsv7.0BinCorFlags.exe) to determine the status of an assembly, based on its output and opening an assembly as a binary asset you should be able to determine where you need to seek to determine if the 32BIT flag is set to 1 (x86) or 0 (Any CPU or x64, depending on PE ):
Option | PE | 32BIT
----------|-------|---------
x86 | PE32 | 1
Any CPU | PE32 | 0
x64 | PE32+ | 0
The blog post x64 Development with .NET has some information about corflags .
Even better, you can use Module.GetPEKind to determine whether an assembly is PortableExecutableKinds value PE32Plus (64-bit), Required32Bit (32-bit and WOW), or ILOnly (any CPU) along with other attributes.
Just for clarification, CorFlags.exe is part of the .NET Framework SDK. I have the development tools on my machine, and the simplest way for me determine whether a DLL is 32-bit only is to:
Open the Visual Studio Command Prompt (In Windows: menu Start/Programs/Microsoft Visual Studio/Visual Studio Tools/Visual Studio 2008 Command Prompt)
CD to the directory containing the DLL in question
Run corflags like this: corflags MyAssembly.dll
You will get output something like this:
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 : 3
ILONLY : 1
32BIT : 1
Signed : 0
As per comments the flags above are to be read as following:
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