Why Does Loading a DLL with Python\'s CTypes Throw OSError: [WinError 193] %1 is not a valid Win32 application?

Python CTypes - Loading dll throws OSError: [WinError 193] %1 is not a valid Win32 application

This error occurs when Python's CTypes library attempts to load a dynamic link library (DLL) with an invalid format. The underlying Windows error code is ERROR_BAD_EXE_FORMAT (193), indicating that the file is not a valid PE (Portable Executable) image.

Causes:

• The DLL file is incomplete or corrupted.
• The DLL file is not a valid PE image (e.g., it may be a text file).
• The DLL file was compiled for a different CPU architecture (e.g., 64-bit vs. 32-bit).

Resolution:

• Ensure that the DLL file is complete and not corrupted.
• Check if the DLL file is a valid PE image using a tool like Dependency Walker.
• Verify that the DLL file was compiled for the same CPU architecture as the Python process.

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