The String File is typically a .pac file in the WWE 2k series of games and it's predecessors where strings of text of the game are stored. In WWE 2k15 and WWE 2k16 the file is named string.pac while in WWE 2k17 it's named string_win.pac .
A String File is a file where Strings of Text are stored. Each string in the file is stored at it's own address offset. With this offset one can tell the game to display the String at that location in the String File, for example for Wrestler Names, Attire Names, Arena Names and more.
Custom String Files
File Breakdown and Analysis
This file type is different for various games. This section breaks down this file type per game.