How Can I Determine the Architecture (x86 or x64) of a Native DLL from Managed Code?

How to Identify the Architecture of a Native DLL from Managed Code

In managed code applications, determining the architecture (x64 or x86) of a native assembly can be crucial for ensuring compatibility. While the PE header contains this information, it can be difficult to parse directly.

Using the DUMPBIN Utility

The DUMPBIN utility provides an efficient way to retrieve the architecture of a native DLL. By passing the /headers or /all flag, you can display the PE headers, including the machine type.

• 64-bit DLL:

  dumpbin /headers cv210.dll |find "machine"
        8664 machine (x64)

• 32-bit DLL:

  dumpbin /headers acrdlg.dll |find "machine"
             14C machine (x86)

Alternative Methods

For advanced scenarios, you can parse the PE header manually using native C . However, the DUMPBIN utility simplifies the process for most cases.

Note: The machine type field in the PE header indicates the intended architecture of the DLL, which may not necessarily align with the actual bitness of the system it is running on.

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