*UPDATE 6/29/2020* The mod is working as far as I know, tested some changed variables that worked. If there are further issues, let me know.

So, this isn't anything new here, just an updated version of what others have posted. There are four files, one with 2x the normal durability rate, one with 10x the normal durability rate, one with 100x the normal durability rate, and one with 1000x the normal durability rate. Take your pick. I didn't include the unlimited option because I wasn't sure if it was smart leaving a 0 in the durability line so I replaced it with 1000x, which is practically infinite.

INSTALLATION
1. Navigate to the game's file directory (right-click in the Steam library, then select properties, then Local Files, then Browse Local Files).
2. Enter the 'DW' Folder and copy the Data3.pak file and save it somewhere else. (It isn't very big, and this makes sure your original file is good to go)
3. Drag and drop/Copy and paste my file (named 'Data3.pak) into that 'DW' folder and overwrite when it asks.
4. Play the game, hitting as many zombies as you like.

If there are any questions, feel free to ask. I didn't use anyone else's work, I just made this myself. Hope your guys enjoy it, have fun!