failed to load pepflashplayer.dll in build mode

I’m trying to load pepflashplayer.dll in Windows OS using this code:

app.commandLine.appendSwitch('ppapi-flash-path', path.join(__dirname + '/lib/pepflashplayer.dll'))

The package.json file looks like this:

{
  "name": "electron-quick-start",
  "version": "1.0.0",
  "description": "A minimal Electron application",
  "main": "main.js",
  "scripts": {
    "start": "electron .",
    "build": "build --dir"
  },
  "build": {
    "appId" : "cristest",
    "productName" : "testing package",
    "win": {
      "target": "nsis",
      "extraResources": "./lib/*.dll"
    },
    "directories": {
      "buildResources": "resources",
      "output": "release"
    }
  },
  "devDependencies": {
    "electron": "~1.6.2",
    "electron-builder": "^19.16.0"
  }
}

Running npm start will load the flash game ok:

Running npm build -w will build the app in release folder, and copy the dll file in release\win-unpacked\resources\lib folder, and running the exe file will fail to load the dll and the flash game will not work:

The folder structure looks like this:

How could i make the plugin run also in “package mode”?

Issue related to #664

[develar]

app.commandLine.appendSwitch('ppapi-flash-path', path.join((__dirname.includes(".asar") ? process.resourcesPath : __dirname) + '/lib/pepflashplayer.dll'))

[Swiminsky]

u can see https://github.com/electron/electron/issues/1779