I am trying to create a extension in visual studio 2017 involving a custom options page as per the documentation mentioned at https://docs.microsoft.com/en-us/visualstudio/extensibility/creating-an-options-page?view=vs-2017
But I am not able to resolve the 'GuidList' being used in attribute [Guid(GuidList.guidMyToolsOptionsPkgString)] It is mentioned that GuidList resides in the assembly Microsoft.VisualStudio.Data.Schema.Project.dll.
But where do I find his assembly? Its not present in visual studio 2017 installation it seems!