This script depends on AutoHotkey v1.1.
Replace NAME on line 3 of lrpg_fix.ahk with the exact name of the application you want to force to work in borderless fullscreen, then run the application first, and only after that — run the script.
If your monitor's resolution is not 1920x1080, you need to change the values of width and height on line 13 of lrpg_fix.ahk — type your width and height and add 14 pixels to both.