There is only one file type that uses the .OLL extension:
TrialDirector Object Load List
Load file used by TrialDirector, a program used to create, organize, and present trial information; contains ASCII text used to establish relationship for multi-page TrialDirector documents and determine which tab is associated with each item.
NOTE: The OLL file contains nine fields, which include Record Type, Document ID, Item ID, Page Number, Description, Volume Label, Path, Filename, and Special Field.
Updated: January 22, 2016