itch.io

Well, I don't know either - this isn't even in my code.

You could try using the mini-plugin I made for copying paths into clipboard as a workaround,

https://bitbucket.org/yal_cc/copy-path/src/master/

but I would highly suggest to test with Electron Fiddle and file a bug with them so that it's fixed at some point.

Here's a snippet to put in Render Process in Electron Fiddle to check:

const electron = require('electron')
let path = electron.remote.app.getPath("userData");
console.log(path);
electron.shell.openExternal(path);