I gave the wrong directory name, sorry. It should be "c:\log" with no 's'. What I see is a single file called dbg.csv which contains data, just saying that no mount has been detected in my case.
The code checks for this directory name and if it isn't present won't write anything.
I had to disassemble the driver dll to find this.
It isn't the way I'd do logging and doesn't use the ASCOM provided log functionality.
Chris