An attempt was made to load a program with an incorrect format” even when the platforms are the same

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change "Enable 32-Bit Applications" to "TRUE".
Restart your website and it should work.
enter image description here
OR
In Visual Studio, Right Click your project -> On the left pane click the Build tab,
Project properties, build tab
under Platform Target select x86 (or more generally the architecture to match with the library you are linking to)
Project properties, platform target
I hope this helps someone! :)

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