using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
var s = "\"C:\\My Program\\Sample Folder\\SubFolder2\\MyApp1.exe\" -parameter13XY1 -parameter101XZ2";
var r = Regex.Replace(s, "^\"([^\"]*)\".*$", "$1");
Console.WriteLine(r);
	}
}