Adding a custom action

[Scott(0)]

Hi Rbdflyboy

This probably isn't exactly what you're asking but it could be a possible solution.

trying  to put a single picture on the desktop

I can put a link to a single picture on my desktop by right-clicking on a png file in my pictures folder > send to > desktop (create link)

which program will allow me to open the file directly on the desktop and leave it there?

In the above png example I can open the file directly from the desktop and I can leave the link there.