In the context of game cracking and warez, a "repack" is a compressed, pre-installed version of a game or mod. However, in the DayZ modding underground, a "repack" has a specific meaning:
To optimize performance, models are "binarized" into a format called ODOL (Organized Data On-the-fly Loading). This format is readable by the game engine but cannot be edited by standard 3D modeling tools like Object Builder . p3d debinarizer dayz repack