The most popular use case for average players is client modification.

Modding a PK2 file to make walls transparent (wall-hacking), removing skill animations to cast spells faster, or altering collision data to map-hack is strictly considered cheating. Modern anti-cheat engines (like X-Trap or Easy Anti-Cheat) will detect these modifications instantly, resulting in permanent hardware or account bans.

Many files inside are in proprietary formats. For example, Silkroad uses .ddj for images. You may need a DDJ to DDS converter to actually view the images you’ve extracted. Is Using a PK2 Extractor Safe?

Contains user interface (UI) assets, text strings, item descriptions, font layouts, and game scripts.

Changing repetitive grinding music to your own custom MP3 playlists.

While every tool is slightly different, the general workflow remains the same: