Given the structure of the string—particularly the ios prefix, followed by a sequence of numbers (3864), another alphanumeric segment (v4123), and ending with wad—this could potentially be:
If you possess this file because you are attempting to modify a Wii or restore functionality: ios3864v4123wad top
log show --predicate 'eventMessage contains "ios3864v4123wad"' --last 1h
Look for whether it was launched by a known service (e.g., systemd, cron, bash). Given the structure of the string—particularly the ios