Look inside pc\characters\vaas\ . You will find every single voice line he ever recorded—including unused takes and alt versions of famous speeches.
For reverse engineering, modding, or audio extraction, the .fat is the key to understanding the contents of the .dat . No public documentation exists from Ubisoft, but the community tools have fully reverse-engineered the structure. The format is stable across Dunia Engine games ( Far Cry 3 , Far Cry 3: Blood Dragon , Far Cry 4 with minor variations).
audio/vo/missions/mission_01/jason_01.wav audio/ui/confirm.ogg audio/ambient/jungle_birds_loop.ogg audio/weapons/ak47_fire.ogg