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Editorial Team
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Asked: 2026-05-12T18:20:32+00:00

What’s the easiest way to discover (without access to the source project) whether a

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What’s the easiest way to discover (without access to the source project) whether a .NET assembly DLL was compiled as ‘x86’, ‘x64’ or ‘Any CPU’?

Update: A command-line utility was sufficient to meet my immediate needs, but just for the sake of completeness, if someone wants to tell me how to do it programmatically then that would be of interest too, I’m sure.

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  1. Editorial Team

    If you just want to find this out on a given dll, then you can use the CorFlags tool that is part of the Windows SDK:

    CorFlags.exe assembly.dll

    If you want to do it using code, take a look at the GetPEKind method of the Module class:

    Assembly assembly = Assembly.LoadFrom("path to dll");
PortableExecutableKinds peKind;
ImageFileMachine imageFileMachine;
assembly.ManifestModule.GetPEKind(out peKind, out imageFileMachine)

    You then need to examine the peKind to check its value. See the MSDN docs for PortableExecutableKinds for more info.

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