I have the following dual-screen set up on my Windows 7 PC: [2][1], that means my secondary monitor is on the right side of my primary monitor.

Now I have a dual-screen wallpaper that should stretch across the monitors. I have set it to "Tile" mode.

Problem: The wallpaper invariably starts at [1] (left edge of the image being on the left edge of [1]), and then continues on [2]. It basically splits the wrong way, producing a rather awkward look.

How can I make the wallpaper appear correctly (i.e. left edge of the image being on the left edge of [2])?