@ meera +1
I didn't even think to look at file properties
The panic is off.

REWFY.exe file has gone but now (after a cold boot) there is now a NEB.exe
- a "plant" by Microsoft "Sysinternals"
My problem now and not out of Kobo or ADE
- curious why in "temp" folder
Thanks for steering me in the right direction.

A cold sweat when I first found it.