dotnet-installer/packaging/windows/host/variables.wxi

<?xml version="1.0"?>
<Include xmlns="http://schemas.microsoft.com/wix/2006/wi">

  <?define Servicing_Key_SP   =   "0" ?>
  <?define Servicing_Key_SPIndex   =   "0" ?>
  <?define Servicing_Key_SPName   =   "Beta" ?>
  <?define Dotnet_ProductVersion   =   "$(var.BuildVersion)" ?>
  <?define Dotnet_DisplayVersion   =   "$(var.DisplayVersion)" ?>
  <?define Dotnet_BuildVersion   =   "$(var.BuildVersion)" ?>
  <?define Manufacturer     =   "Microsoft Corporation" ?>
  <?define ProductName      =   "$(var.ProductMoniker) ($(var.NugetVersion) $(sys.BUILDARCH))" ?>
  <?define ProductLanguage  =   "1033" ?>
  <?define ProductVersion   =   "$(var.Dotnet_ProductVersion)" ?>
  <?define LCID  = "$(var.ProductLanguage)"?>
  <?define DowngradeErrorMessage  = "A newer version is already installed; please uninstall it and re-run setup."?>

  <?define Platform   =   "$(sys.BUILDARCH)" ?>
  <?if $(var.Platform)=x86?>
  <?define Program_Files="ProgramFilesFolder"?>
  <?define Win64AttributeValue=no?>
  <?define UpgradeCode="66EBF603-F032-4595-B914-10CC99BBED86"?>
  <?elseif $(var.Platform)=x64?>
  <?define Program_Files="ProgramFiles64Folder"?>
  <?define Win64AttributeValue=yes?>
  <?define UpgradeCode="4553594B-D821-40E0-9A54-9697B13E344C"?>
  <?else?>
  <?error Invalid Platform ($(var.Platform))?>
  <?endif?>
</Include>