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Editorial Team
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Asked: 2026-05-20T10:52:14+00:00

How do I test an existing managed .NET .dll to see if its 32-bit

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How do I test an existing managed .NET .dll to see if its 32-bit or 64-bit?

Known dead ends:

  • “dumpbin /header” doesn’t work, it returns 32-bit for everything (its only looking at the native win32 headers).
  • Dependency Walker doesn’t work, as its for native win32 .dll’s.
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1 Answer

  1. Editorial Team

    Start up Visual Studio 2008 Command Prompt, go to the folder your assembly is in type “corflags.exe assemblyName.dll” and you should get the following info back

    Version   : v4.0.30319
CLR Header: 2.5
PE        : PE32
CorFlags  : 1
ILONLY    : 1
32BIT     : 0
Signed    : 0
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