Really nice looking! The buttons are a little too big. Maybe it's for touch screen.
Yes, it is touch-screen app.
And are those custom window borders or are they just simulated with a control with high Z-order?
Actually, everything is painted by U++, all "windows" are borderless popups. I guess that the window frame you see on screenshots are just because screenshots, normally it occupies the whole screen (OTOH, I have not seen the app for more than 1.5 years
Don't suppose you have access to the skin and can make it publically available?