title: WIX: is the Platform attribute of the Package element truly deprecated?
body: <p>If so, what is the appropriate way to specify an x64 build? </p>
  
  <p>In my .wxs file, I have something like this: </p>
  
  <pre><code>&lt;Package Description      ="$(var.pkgDescription)"
           Comments         ='Produced: Sun 17 April 2011'
           Manufacturer     ="Mfr name here"
           InstallerVersion ='200'
           Platform         ='$(var.Platform)'
           Compressed       ='yes' /&gt;
  </code></pre>
  
  <p>...where I use <code>-dPlatform=x64</code> on the candle.exe command line. This seems to work.</p>
  
  <p>But, in the WIX3 documentation, it states that both the <code>Platform</code> attribute and the <code>Platforms</code> attribute are deprecated.  It does not describe what replaces them, or what developers should use in place of these. </p>
  
  <p><img src="https://i.stack.imgur.com/h69ZH.png" alt="enter image description here"></p>
  
  <p>When I remove the Platform attribute from the above element, and run the build, I get an ICE80 error: </p>
  
  <blockquote>
    <p>Product.wxs(285) : error LGHT0204 : ICE80: This package contains 64 bit component 'C.Textfiles' but the Template Summary Property does not contain Intel64 or x64.</p>
  </blockquote>
  
  <p>It builds successfully if I use the <code>Platform</code> attribute, but because of the documentation, I am unsure if this is correct.</p>
  
  <p>What is the proper way to build an x64 MSI??</p>