Silverlight Out of Browser without installing?

Question

Is there any way that I can have the user run my silverlight application with the use of sllauncher.exe and the emulate option from my server?

This is what I currently have:

sllauncher /emulate:"Prog.xap" /origin:"http://domain.com/Prog.xap"

The only problem with this is that it only works if there is a local file, is there any way that I don't need anything to be downloaded on the user end?

Thanks