C# project using Javascript

Type scriptType = Type.GetTypeFromCLSID(Guid.Parse("0E59F1D5-1FBE-11D0-8FF2-00A0D10038BC"));
dynamic obj = Activator.CreateInstance(scriptType, false);
obj.Language = "javascript";

I got this, and don't know what is "0E59F1D5-1FBE-11D0-8FF2-00A0D10038BC" and what is doing all 4 rows.