在VS.NET2005中可以这样用

        string strzipPath = "g:\\freezip\\test.TAR";
        string strtxtPath = "";
        System.Diagnostics.Process Process1 = new System.Diagnostics.Process();
        Process1.StartInfo.FileName = "Winrar.exe";
        Process1.StartInfo.CreateNoWindow = true;
        strtxtPath = "g:\\freezip\\";
        Process1.StartInfo.Arguments = " x " + strzipPath + " " + strtxtPath;
        Process1.Start();
        Process1.Dispose();