This does indeed spawn two Desktop Background processes and I believe I discovered why. I have "Launch folder windows under a separate process" enabled in Folder Options. If I disable that setting...

Yes, this causes two windows to open as well. I did notice that the first time I ran it it did not cause this behavior, but every time after that does. It seems that the first time I open the window...

It happens every single time on two different machines, so I know I'm not double clicking. I successfully removed the mod and then reinstalled it and it still occurs. Very strange...

For some reason the Desktop Background opens two windows. Everything works fine, but it's a bit of an annoyance. Any idea why it would do this?