how can i send win Explorers selected file/folder list to myprogram using commandline

i want to sent the list of selected file/folder from windows explorer to my program

i've tried it by sending it through command line but every time it opens a new instance of my program. and when i prevented it from openning no more than one instance than its getting only one item from explorer through command line.

[to send command line argumnt i first did some manupulation into registry to appear my programs name into windows explorer right click menu than. right click on any file and click "send it's name to program"]