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Home/ Questions/Q 5979195
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T21:37:31+00:00 2026-05-22T21:37:31+00:00

I have created an application (compiled any cpu) that use a lib also compiled

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I have created an application (compiled any cpu) that use a lib also compiled as any cpu (the library reference interop.CDO), and i have this error message:

Could not load file or assembly ‘Interop.CDO, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’ or one of its dependencies.Attempt was made to load the program with an incorrect format.

The problem is related with 64/32 compatibility. any solution for this problem ?

Thanks for help.

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  1. Editorial Team
    Editorial Team
    2026-05-22T21:37:31+00:00Added an answer on May 22, 2026 at 9:37 pm

    I think that CDO was deprecated in the previous century. There certainly will never be a 64-bit version of it. There’s little point, .NET has good SMTP support.

    Use Project + Properties, Build tab, Platform target = x86 on your EXE project if you have to. If this is ASP then you’ll have to run your web app in a 32-bit application pool.

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