TwinCAT - Library categories
This is a template for defining your own library categories for TwinCAT3.
Read more on: http://alltwincat.com/2018/08/16/library-categories/
Without defining a library categories, all your libraries will be shown under the (Miscellaneous)-category in TwinCAT:
However, if you define a category (or possibly sub category) for your library you will instead get: