Favorite Documents extension lets you create links to frequently used code files and then quickly open them as a group or individually in Visual Studio 2010+.
v2.1 now saves and restores the cursor position in a favorite document and adds the ability to create one level of subfolders.
Making Visual Studio perfect 
Any chance of updating to support VS2019?. It would be much appreciated.
I’ve added support for VS 2019 in v2.4.0: https://visualstudioextensions.vlasovstudio.com/2019/02/06/favorite-documents-v2-4-0-adds-support-for-visual-studio-2019/