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Editorial Team
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Asked: 2026-06-15T22:29:10+00:00

I am referencing to an assembly built on .net 2.0 in .net 3.5 project.

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I am referencing to an assembly built on .net 2.0 in .net 3.5 project. Its working fine on Windows xp machine, but when deploying on Win2003 64 bit

I am getting error below 

System.BadImageFormatException: Could not load file or assembly 'Wrapper, Version=5.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.

WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

Project is built on Win xp 32 bit machine and then deployed using wix installer, Tried manually replacing assembly but didn’t work.

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1 Answer

  1. Editorial Team

    You should check the build properties of the Wrapper assembly. I suspect it’s set to 32-bit (x86). You’ll need it to either be AnyCpu or x64 in order to be loaded into a 64-bit CLR.

    Now if it’s actually a wrapper for unmanaged code, you probably want two different versions of the assembly – one for 32-bit and one for 64-bit.

    Another alternative is to change your application to be 32-bit. It’s not clear what kind of application you’re running, or whether that would be suitable – but it’s worth considering.

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