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POHow to invoke a 32bit COM interop dll from VS 2010 Solution which is targetting 64 bit machines
 

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  1. POHow to invoke a 32bit COM interop dll from VS 2010 Solution which is targetting 64 bit machines
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    <p>I am working on Windows client application using c#, have two projects in my VS 2010 solution, the start-up project and a class library which uses third party COM interop DLL.My desktop is 64 bit and all the client machines are 64 bit as well. </p> <p>If I keep the start-up project as any cpu in (build settings) and x86 for the second project which invokes the COM DLL, I am getting the following error:</p> <pre><code>Could not load file or assembly ... or one of its dependencies. An attempt was made load a program with an incorrect format. </code></pre> <p>If I keep both the projects as Any cpu, I am getting the following error:</p> <p><code>Retrieving the COM class factory for component with CLSID .. failed due to the following error:</code> </p> <p>Any idea how to resolve the issue without converting the solution (all projects) to x86. </p>
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    1. COYou are going to have to talk to the COM component vendor and see what they can do to provide you with a 64-bit version of their product. Or just set the Platform target setting of your main EXE project to x86.
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      1. POHow to invoke a 32bit COM interop dll from VS 2010 Solution which is targetting 64 bit machines
      1. USHans Passant
    2. COnot possible in general, see related question [here](http://stackoverflow.com/questions/611651/64-bit-c-sharp-with-a-32-bit-vb6-com-object)
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    3. COIs there a good reason why you don't just target x86?
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      1. POHow to invoke a 32bit COM interop dll from VS 2010 Solution which is targetting 64 bit machines
      1. USDavid Heffernan
 

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