Configure .NET Core to use x86 SDK

Found the solution.

When I installed the x64 version, it created an entry in my PATH environment variable called C:\Program Files\dotnet. I uninstalled the x64 version and installed the x86 version. However, the un-installation of the x64 version did not remove the C:\Program Files\dotnet from my PATH. So, I removed it manually, and made sure that the entry that the x86 version added, C:\Program Files (x86)\dotnet, existed.