electron/docs/tutorial/represented-file.md

Represented File for macOS Windows

On macOS a window can set its represented file, so the file's icon can show in the title bar and when users Command-Click or Control-Click on the title a path popup will show.

You can also set the edited state of a window so that the file icon can indicate whether the document in this window has been modified.

Represented file popup menu:

To set the represented file of window, you can use the BrowserWindow.setRepresentedFilename and BrowserWindow.setDocumentEdited APIs:

const { BrowserWindow } = require('electron')

const win = new BrowserWindow()
win.setRepresentedFilename('/etc/passwd')
win.setDocumentEdited(true)