The image above shows Windows Explorer (left-side) and EZdrummer (right-side), and helps you to see the naming scheme that Toontrack has used to create the different MIDI Library Category Titles and the folders for the Individual Styles. As you can see, I've added in my own additional catagories for GROOVE MONKEE, BEATBOY, and SONAR.

 
 

 

 

EZdrummer allows you to go 3 folders deep if needed. The image above shows that each style folder typically contains additional sub-folders that further categorize the different MIDI drum grooves.