setAsDefaultProtocolClient on windows 7

[kof]

The problem is reproducible using the ElectronAPIDemos package version 1.2.0, just cloned from master.

• Electron version: 1.4.7
• Operating system: Windows 7 Ultimate Service Pack 1, 32 bit, using Parallels
• Node 6.3.0

Expected behavior

When clicking on the link like demo says, electron app should be opened.

Actual behavior

Internet Explorer shows an error.

Error launching app
Unable to find Electron app at \\psf\Home\Desktop\electron-api-demos:\open
Cannot find module ' \\psf\Home\Desktop\electron-api-demos:\open'

How to reproduce

1. Clone the repo https://github.com/electron/electron-api-demos
2. npm i && npm start
3. go to protocol-link example in the app, it opens a page in the browser (it happens in IE11 and in Chrome with slightly different error description)
4. click on the link

[MarshallOfSound]

The setAsDefaultProtocolClient only works on packaged versions of the application 👍

[kof]

Then this is a documentation bug, right?

[MarshallOfSound]

@kof See #271 and #275