electron/docs/fiddles/features/represented-file/main.js

const { app, BrowserWindow } = require('electron')
const os = require('os');

function createWindow () {
  const win = new BrowserWindow({
    width: 800,
    height: 600
  })

  win.loadFile('index.html')
}

app.whenReady().then(() => {
  const win = new BrowserWindow()

  win.setRepresentedFilename(os.homedir())
  win.setDocumentEdited(true)
})

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', () => {
  if (BrowserWindow.getAllWindows().length === 0) {
    createWindow()
  }
})