DR> I'm guessing that Mystic is keeping the files locked, so it can keep
 DR> writing to them. I just don't have any issues with this under Linux...

I believe it is locked while Mystic has it open.  I had this problem when I
wrote an interface to monitor the message queue of a delivery system over HF
radio, the program used to deliver the MAPI messages locked all the files so
I had to copy them to a temp location in order to parse their headers.

 DR> What I will probably have to do, is make a copy of the log files, read
 DR> them, then delete the copies, if Windows is the OS. Is there a better
 DR> way of doing this?

--- Mystic BBS v1.12 A39 2018/04/21 (Linux/64)
 * Origin: The Vista BBS - Vallejo, CA  USA (1:218/640)