I sat down and selected the first of the files and then scrolled through them to select all and watched the list fly by.

All the files were created / modified on 3 days. All files were created / modified within minutes of each other on their respective days.

Arthur, I deleted all the files and edited a few photos and used the vignette filter (not a filter that I use much) and no further reports have been written to "c" drive.

Phil, after reading your post, I started thinking and whilst I haven't had any NX "crashes" I did have a usb memory stick that froze the pc a while ago and it it may have been that crash that led to the generation of the files.

It is starting to look like a problem related to the memory stick crash as it did have NX modified images on it at the time.

I will keep an eye on the "c" drive in future for odd .txt files cropping up.