electron-packager associate with file type (support drag)

extra.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>CFBundleDocumentTypes</key>
  <array>
    <dict>
      <key>CFBundleTypeExtensions</key>
      <array>
        <string>txt</string>
      </array>
      <key>CFBundleTypeIconFile</key>
      <string>electron.icns</string>
      <key>CFBundleTypeMIMETypes</key>
      <array>
        <string>text/plain</string>
      </array>
      <key>CFBundleTypeName</key>
      <string>Text document</string>
      <key>CFBundleTypeOSTypes</key>
      <array>
        <string>TXT</string>
      </array>
      <key>CFBundleTypeRole</key>
      <string>Editor</string>
    </dict>
  </array>
</dict>
</plist>

package.json

{
  "name": ".",
  "author": ".",
  "description": ".",
  "version": "0.1.0",
  "dependencies": {
  },
  "devDependencies": {
    "electron": "^2.0.3"
  },
  "main": "index.js",
  "private": true,
  "scripts": {
    "start": "electron .",
    "package": "electron-packager . --extend-info extra.plist"
  }
}