Directories inside Windows Libraries have their own registry "folder" for it's context menues.

This patch also adds a context menu option when right clicking the folder itself in explorer, but selecting it gives a not implemented error. You can add the following keys similar to the others:

HKEY_CLASSES_ROOT\LibraryFolder\Background\shell\Open Folder in Sublime Text 2
HKEY_CLASSES_ROOT\LibraryFolder\Background\shell\Open Folder in Sublime Text 2\command

However the variable is different. It's not: %1, %V, %L, %D.