The suffix _aNUMBER indicates the attack type (https://github.com/hashcat/hashcat/blob/0885c0ec6bcd4f2a3d1219acfd8525a9a23e466d/src/opencl.c#L36) 0: straight 1: combi 3: bf
if attack_exec != INSIDE_KERNEL: use suffixless file
The suffix _aNUMBER indicates the attack type (https://github.com/hashcat/hashcat/blob/0885c0ec6bcd4f2a3d1219acfd8525a9a23e466d/src/opencl.c#L36) 0: straight 1: combi 3: bf
if attack_exec != INSIDE_KERNEL: use suffixless file