User Defined
This allows you to fully control how UTCC will handle known and unknown file types.
Here's what the User Defined tab looks like:
Define a file definition
Prefix - anything entered here will be used to look at cache names
beginning from the left
Extension - anything entered here will be used to look at the end of
cache names
Directory for Files - tells UTCC where to put these file types
Notes - anything you'd like to save about this file definition