Persona Q contains various DLC packs.
1-4 are unimportant. When extracted, they create a "contentdata.txt" created with the DLC's name. Each one is exactly 20 KB.
DLCs 5-9 have their own CPKs. When extracted, each consists of a "battle", "dungeon", and "sound" directory. "battle" contains a "support" folder, and a BVP file containing English transcriptions for the battle voiceovers. "dungeon" contains a "pack" folder and an ARC file with English captions for the overworld dialogue. "sound" contains a majority of the content, with separate files for both overworld (dcommon) and battle dialogue (btlhlp), in AWB format and suffixed with an abbreviation of the navigator's name. For example, Elizabeth's battle dialogue is located in btlhlp_e.awb.