Hi Ilias,
Thanks for your post and feedback. The xx_1.fxt and xx_2.fxt data files are created when back-testing with the “crude” and “open price” models. These modes are significantly inferior to tick-based back-testing and are not supported by Tickstory. If you wish to get a rudimentary idea of how your strategy is working, you could use the standard Metatrader data history to do this (I would advise setting up a separate Metatrader installation for this purpose).
Hope this helps!