AJAX call not working in WP8 project

Link to .capx file (required! If link is blocked remove the http and www parts):

rachwal.com.pl/ajax_wp8.capx

Steps to reproduce:

1. Add sample text file to Files directory

2. Add AJAX and Browser objects

3. Add "System - On start of layout" event and "AJAX - Request project file" action.

4. In "AJAX - On completed" event add "BROWSER - Alert"

Observed result:

Alert box not showing

Expected result:

Alert box should show after AJAX project file is loaded.

Browsers affected:

Windows Phone 8.0 emulator & device

Operating system & service pack:

Developing computer: Windows 8.0, Visual Studio 2012 Ultimate

Construct 2 version:

Release 158.2 (64-bit)

Is this an emulator issue?

I haven't had the chance to investigate this yet, but given that as far as I'm aware it works on every other platform, this may be a limitation in WP8 rather than a C2 bug.

AJAX works on my game. It's in the store already.

And it worked in emulator too.