Why was this scrapped? Because it was good at the windows rendering(because the windows always chose the back but it's more of an inconvenience , but when I tried to render a smiley in a window it didn't work well so I just scrapped it.. you can use this for "accurate windows" even though it can't handler anything inside ;_;... but still good though..)
But How I'm planning to do teh new ones are just; App adds itself to a list, the app renders then the window gets overlayed on top!(not 100% the best I'll see what i can do!!!) So yeah free Windows Engine(kinda) for you ^^