Ripping Iphone sprites?

[Name_Changer]

hmm okay so i downloaded and opened the IPA file for the game Hybrid and it has png files in it but none of the names look like theyd be sprites, they sound more like backgrounds and when i open them they vary in size but are all blank whites. I searched for a hex editor and found XVI32 but when i opened Hybrid with it....well i have no clue what im doing. There's also .PZX files in there which i think are the real images but im having a hard time finding out how to open them.
Any suggestions?