Programmatically add snk file to Solution Items using DTE object

Hi Folks,

How can I programmatically add snk file to solution items(at solution level) using DTE object.

var solution = this.dteObject.Solution as EnvDTE100.Solution4;
solution.AddFromFile(snkFilePath, false);

It throws an error "specified template could not be found.Check the full path".

Does Solution.AddFromFile expects only project items.How do I add snk file at solution level programmatically