title: Build standalone .exe from electron app using electron-builder
body: <p>I'm using electron v6.0.9 with electron-builder v21.2.0. Here is the packaging configuration from my <code>package.json</code> for a production build.</p>
  
  <pre><code>"build": {
      "appId": "com.app.prototype",
      "productName": "Pluto",
      "copyright": "Copyright © 2018 Simon Inc.",
      "mac": {
        "target": [
          "zip"
        ]
      },
      "win": {
        "publisherName": "Simon Inc.",
        "target": [
          "nsis",
          "zip"
        ]
      },
      "linux": {
        "target": [
          "AppImage",
          "tar.gz"
        ]
      },
      "dmg": {
        "icon": "build/icon.icns"
      },
      "publish": {
        "provider": "generic",
        "url": "THE_RELEASE_URL_HERE",
        "channel": "latest",
        "publishAutoUpdate": true
      }
    },
  </code></pre>
  
  <p>I configured the build script as <code>"pack": "electron-builder --dir -mwl",</code> in <code>script</code>. The issue is, when i run the command <code>npm run pack</code>, it packages the application for all the platform, but for windows there is no single installer file either <code>.exe</code> or '.msi'. <code>electron-builder</code> builds bunch of files for windows.</p>
  
  <p>I'm running on macOS High Sierra v10.13.6 (17G8030). I also tried building on windows 10 system but outcome is the same. is anything misconfigured here or there some more steps required to generate single installer file for windows? </p>