I checked and there are 32x bios files in there. However, I'm not sure if I have the proper names or not. Looking at Retroarch's Picodrive info page I don't see anything about bios files for 32x, just the Megadrive and CD, both of those of which I have and are named properly. Bios files I have in there for 32x are [BIOS] 32X M68000 (USA), [BIOS] 32X SH-2 Master (USA), [BIOS] 32X SH-2 Slave (USA), 32X_G_BIOS, 32X_M_BIOS, and 32X_S_BIOS.