Ok, I figured out why I got "invalid costume", these are AKOS costumes of course. So here is the data from the AKOS headers: 13: 264 bytes flags=0 num_anims=8 codec=1 14: 295832 bytes flags=3 num_anims=440 codec=1 15: 215342 bytes flags=3 num_anims=360 codec=1 18: 228362 bytes flags=3 num_anims=512 codec=1 // Marcus