on modern hardware or VR headsets, you generally need the original game assets (the files) from a legitimate copy of the game. Where to Get Doom 3 PK4 Files
PK4 files serve as a unified distribution method for high-volume game assets. For the original release of Doom 3, uncompressed assets totaling were packed down to 1.44GB using this format. Standard Files :
on modern hardware or VR headsets, you generally need the original game assets (the files) from a legitimate copy of the game. Where to Get Doom 3 PK4 Files
PK4 files serve as a unified distribution method for high-volume game assets. For the original release of Doom 3, uncompressed assets totaling were packed down to 1.44GB using this format. Standard Files : Doom 3 Pk4 Files Download