Get Command Item for getting file path

[Keristero]

I'm trying to make a editor for .entity files that will open when I double click an entity file, I've associated them with the Power System Object.
this is the CommandLine$ string I get when I double click to open a .entity file.

"C:\Users\KERIST~1\AppData\Local\Temp\mrt2A8B.tmp\ stdrt.exe" "C:\Users\Keristero\Desktop\he ro.entity"

But I only want the second string ("C:\Users\Keristero\Desktop\he ro.entity" )

I know I should be able to use the CommandItem$("") special condition but I don't know what command to give it.

the help documentation says
"Command Line

Get Command Line returns the command line of the application.
Get Command Item returns each individual option of the command line. For example if the command line is "Myapplication.exe /FThisfile /G /Hello", GetCommandItem$("F") will return "ThisFile", GetCommandItem$("G") will return the string "Empty", and GetCommandItem$("Hello") will also return the string "Empty". If GetCommandItem cannot find the specified command, it returns an empty string (""). "

But as you can see my command line does not have "/F" or "/G" so what can I use?
(I've also tried using string parser 2 but it does not like using (") as a delimiter)