It converts .dat files into editable text format ( .txt ) and back into encrypted binary files.
The creator of the "L2 File Edit Freya High Five By Zelan.rar" file, Zelan, appears to be an individual with an interest in Lineage II game development or modification. Unfortunately, there is limited information available about Zelan's identity or their motivations for creating and sharing this file. L2 File Edit Freya High Five By Zelan.rar