MSB3270: There was a mismatch between the processor architecture...

I had this annoying warning that appeared whenever I would build my Wix setup project. I know, Wix sucks, but what can you do? The warning was warning MSB3270: There was a mismatch between the processor architecture of the project being built "MSIL" and the processor architecture of the reference "SomeProject\Some.dll", "AMD64". This mismatch may cause runtime failures. Please consider changing the targeted processor architecture of your project through the Configuration Manager so as to align the processor architectures between your project and references, or take a dependency on references with a processor architecture that matches the targeted processor architecture of your project.

What is worse, the warning would come in the VS Errors window with no warning code, so I couldn't even supress it. And yes, the text above does show a warning code, but it just wouldn't be intrepreted by Visual Studio.

In order to fix it, apparently I had to set ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch to None, as according to this StackOverflow answer. But where should I add this wonderful property? It didn't work in the .wixproj file, it wouldn't make a difference in the projects mentioned in the warning.

In the end, I decided to customize my build! Final solution:

• add a file called Directory.Build.props to your solution folder
• paste in it

<Project>
 <PropertyGroup>
   <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
 </PropertyGroup>
</Project>