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

Question

I\'m calling functions from a 32-bit unmanaged DLL on a 64-bit system. What I get is:

BadImageFormatException: An attempt was made to load a program w

Answer 1

We were having the same issue in .NET core. The solution was to download 32-bit .netcore runtime, and having your project target x86

In your csproj file add

  
    x86  
  

  
    $(MSBuildProgramFiles32)\dotnet\dotnet    
  

This was used for a Windows machine, you'd have to adjust paths and such for Linux/OSX