os specific paths in strings?

I've got this for my path

 private string outputLocation = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
 private string macOut = @"/ArtifactExampleXML.xml";
 private string winOut = @"\ArtifactExampleXML.xml";

 

and this in my constructor

    public XMLParser(){
        if (SystemInfo.operatingSystem.Contains("Mac"))
            outputLocation = outputLocation + macOut;
        else
            outputLocation = outputLocation + winOut;
    }

There's got to be a way around this and just have it know which way the string should be formatted.. Can someone shed some light on my situation?