C:\Users\YOUR-USER-NAME\AppData\Roaming\FreeFileSync\Logs
are named. Instead of e.g.
SyncSettings 2023-06-13 142359.331.log
SyncSettings 2023-06-13 14_23_59.331.log
SyncSettings 2023-06-13 14.23.59_331.log
SyncSettings 2023-06-13 14.23.59 331.log
SyncSettings 2023-06-13 14_23_59 331.log
And by the way: what is that last 3-digit number? A checksum of some sort?