I tried to set this up last night before bed (I'm at work now) and here's what happened.
I play on 1920x1080 resolution and I followed the instructions on the first page here -> "You want static size 1280x960, and then in borderless tool set to 1440x1080 (to maintain 4:3 aspect ratio)."
However, there is a problem. The game window does not appear. I can see the icon on my windows bar and when I select it, I can hear the game music, but it still shows the desktop and other windows I have open. When I hold down ALT+TAB I can see the windows that I have running, and I can see the D2 Window and such, but can't seem to get it to come to the front. I've minimized all other windows with no luck. Is it related to my Windows bar? I have that set to vanish when I'm not actively mousing over it.
EDIT: Wait wait, I'm an idiot. I had the OFFSET set to 1440x1080. So I've got the game up and it's resizing the window, but I have the black border thing now. I'm gonna go back in the thread and read all about how to fix that.
EDIT EDIT: So I just disabled the static size to no. it's not true borderless but it's nice enough for me to play.
And it's 4.3