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Article ID: 949625 - Last Review: February 23, 2008 - Revision: 1.2
BadImage Format Exception
Source: Microsoft Support
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A .NET 2.0 C# application refers to a 32-bit unmanaged dll. The application is built using C# on Visual Studio 2005 with the “AnyCpuâ€Â platform setting.Â
The application runs fine on 32-bit machine but when it is launched on a 64-bit machine, it throws a BadImageFormatException.
"Unknown exception error hresult:0x8007000B,†which maps to BadImageFormatException.
In this case, the managed C# application is not a pure managed application because it refers to a 32-bit unmanaged or native dll.Â
The 'AnyCpu' switch has the following results:
- A 32-bit process on a 32 bit machine
- A 64-bit process on a 64 bit machineÂ
A 32-bit dll cannot be loaded in a 64-bit process or vice-versa. Hence, when an application running in a 64-bit process tries to load a 32 bit dll, it fails with BadImageFormatException. Simillarly, when an application running in a 32-bit process tries to load a 64-bit dll, it fails with a BadImageFormatException.
When a managed application refers to a native cpu or platform specific dll, it should not be build using the ‘AnyCpu’ switch.Â
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APPLIES TO
- Microsoft .NET Framework 1.0
- Microsoft .NET Framework 1.0 Service Pack 3
- Microsoft .NET Framework 1.1
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- Microsoft .NET Framework 2.0 IA64 Edition
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- Microsoft .NET Framework 2.0 x64 Edition
- Microsoft .NET Framework 3.0
- Microsoft .NET Framework 3.5
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