Technically, a .pk4 file is simply a that has been renamed with a different file extension.

If two mods change the same texture, the one in the PK4 file with the "alphabetically later" name or higher "pak" number will be the one that appears in-game. Troubleshooting Common Issues 1. "Pure Server" Errors

: Doom 3/d3xp/

They package together all the essential assets the game needs to run, including: