When I press Ctrl and click on List in VS2010, List’1.cs file is opened, and the file contains the method headers and the summary comments,

The question is, why thy didn’t name that file List(T).cs or List{T}.cs or List[T].cs?
Why the naming convention List’1.cs, is that standard?
In the CLR, that’s the default way to annotate generic types. List`1 means that this class has one generic type parameter. The brackets are just a C# thing, also they are not valid as file names.