Hhmm, I'm not sure what you mean -- the icon is missing, or the menu item is missing, or the dialog is missing? But all of those appear to me, when I look at the file you attached.
In version 0.91, all the dialogs are docked, by default. So it might be that the dialog is opening in the docked position (on the right side of the canvas).
Or do you mean that your default.svg file is missing?