File targeting 'AMD64' is not compatible with project's target platform 'x86'

Question

I'm trying to create an installation from scratch using Visual Studio 2019 for a old project (it builds) Every time I try to build, I get the

Error: WARNING: File ' something.dll' targeting 'x64' is not compatible with the project's target platform 'x86'.

I am able to use VS2019 to build the old project though. how can I take to resolve this problem?

Answer 1

Resolution:

• When building your setup package you need to target a specific target platform: x86, x64, or Itanium.
• Select your setup project in the Solution Explorer, then open the Properties Window (View > Properties Window)
• Change the TargetPlatform to match the Platform target you set for your WinForm application (see screenshot below).

Source https://userapps.support.sap.com/sap/support/knowledge/en/1548930

Answer 2

You need to be targeting 64-bit (x64 / AMD64) platform for your project build, as one of your components - something.dll - is 64-bit.

To configure a project to target a 64-bit platform

On the menu bar, choose Build > Configuration Manager.

In the Active solution platform list, choose a 64-bit platform for the solution to target, and then choose the Close button.

More details https://learn.microsoft.com/en-us/visualstudio/ide/how-to-configure-projects-to-target-platforms?view=vs-2022