Item description:

In the save, only the Supernatural mode was completed, and all levels, except for secret locations, were completed to a maximum of 5 stars. This means you can quickly access Xfiles without having to play through the game from scratch.

If after loading the save the Xfiles section is still closed, no problem! You can easily solve this problem:

Open the console by pressing the ~ (tilde) key
Enter the cheat code pkxfiles and press Enter
The console can be closed, and the previously unavailable Xfiles option will now be unlocked in the main menu