WinHTTrack 3.43-7

I've tried lots of combinations of options in Build options but I can't seem
to get rid of the added strings found on filenames. For example if

folder/file.html is mirrored it becomes something like

folder/file0df0.html

I am using %h%p/%n.%t in the options and selecting Hide Query Strings, but I
continue to get the funny filenames.

Can someone give me the setting so that original filenames are maintained?
Thanks