How open a local file with the associated program from a web page?

Question

I know the user of my app has a local file named c:\\sourcefile.cs, I need to find a way to render a link to that file so that when he clicks the link, it will open the file in

Answer 1

I don't know about opening in visual studio, but this might work:

file:///c:/sourcefile.cs

It depends on browser, browser settings, and of course file associations.