How can I determine if a .NET assembly was built for x86 or x64?
.net, 64-bit, assemblies, x86, x86-64
Solution
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 the target platform.
- Amd64: A 64-bit processor based on the x64 architecture.
- Arm: An ARM processor.
- IA64: A 64-bit Intel Itanium processor only.
- MSIL: Neutral with respect to processor and bits-per-word.
- X86: A 32-bit Intel processor, either native or in the Windows on Windows environment on a 64-bit platform (WoW64).
- None: An unknown or unspecified combination of processor and bits-per-word.
I'm using PowerShell in this example to call the method.
Problem
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?