I have a vs2015 solution containing an asp.net core project and have configured its project.json as follow :

```
{
  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true,
    "platform": "x86"
  },
  "runtimes": {
    "win10-x86": {}
  },
  "frameworks": {
    "net461": {}
  },
  "commands": {
    "web": "Microsoft.AspNet.Hosting --ASPNET_ENV production --server Microsoft.AspNet.Server.Kestrel --server.urls http://+:12345",
  }
  [...]
}

```

I am expecting the application to build and run with the platform specified in project.json *( FYI, I am running the app via vs2015 debugger on a win10/x64 box )*. However, **win7-x64** runtime is used instead. I can see a **win7-x64** output directory and the prompt title launched indicates it too.

If I build and run directly via command line specifying the runtime, it works.

So my question is, what else do I need to configure to start the asp.net core app in x86 from vs2015 ?