This is quite rare and hard to reproduce bug, but I think I got a way to reproduce it.
To reproduce:
As for preparation, you need to create new folder with three files in it, one image file and two empty files with .dat extension. Rename the files so that the image file is first in the folder. E.g. 1.jpg, 2.dat, 3.dat
Or use this ready to use zip file with all the files you need.
- Make sure you have 'Display all image file types' enabled in XnView options.
- Open the image file in the folder you created before.
- While viewing the image delete the file in XnView with 'Delete' key.
