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The PWP files (possibly standing for PlayStation WAD Package) contain nearly all of the Playstation game's data. The NTCS version only has one pwp file, with all folders inside of it. The PAL game contains an individual pwp file for each of the folders that were found in the NTCS pwp file. The pwp files are located on the Playstation game's disk.
These are compressed files and can be extracted using the PWP Extractor; however, because of the fact that the game is completaly writen to CD, and the files are in different formats, the game is currently unmoddable. Extractions are only used to discover what data it contains.