Because it contains hours of high-quality voice acting (Michael Mando’s performance as Vaas alone takes up hundreds of MB), ambient jungle noise, weapon reports, and the licensed soundtrack.
Extracting these files for personal use, modding, or education falls under fair use in most jurisdictions. However, do not upload the entire 1GB .dat file to a public Google Drive link. Do not sell the extracted voice lines. Ubisoft owns these assets. Respect the artists who made them. Because it contains hours of high-quality voice acting
Typical size: 1–4 GB (often split into multiple .dat parts in console versions).
Structure: ambient jungle noise
No. The game will not launch without them. They contain all the game's spoken dialogue and sound effects. Deleting them saves space but renders the game mute and prone to crashing. Because it contains hours of high-quality voice acting
Don't expect friendly dialogue_01.mp3. Inside, you’ll find files named c3156e2d.wem or 3a9f0b12.ogg.
If the game crashes on startup or during dialogue, or if specific characters have no voice lines, the .dat file may have become corrupted during a download or update.