I play the game in a 1600x900 window, how the window is supposed to be positioned is exactly centered with no window frame visible on either side of the screen.
In WFTO's case the game window is offset to the right which causes the left side of the window frame to be visible, see pic.
This is a common problem with my steam games but usually it's only a pixel or two, in this case the entire window frame is visible. I'm not 100% sure if this is a game code problem or a windows 7 problem but not all of my games have the issue.
For instance Vermintide 2 and Kingdom Rush HD have properly centered windows with no frame visible on either side of the screen. Poly Bridge and Star Trader: Fronteirs have windows that are a few pixels off and the frame is just barely visible on the left side.
Customer support service by UserEcho