[Inkscape-user] a couple of questions about opening files on Windows

Currently, if there is an instance of inkscape running, and I double click an SVG file from the window manager, it opens a new instance of inkscape. Is it possible, somehow, to instruct Windows, or Inkscape, to only allow one instance of inkscape to run and open the file in it?

Second question: can the GTK file open dialog be made to remember the last location a file was opened in, or at least be set to a default location other than the application folder?

thanks,

Michael