'named' or 'snapshot' appended to rendered image files?

Sometime around the V-Ray 6.1 or 6.2 release, the text ‘named’ or ‘snapshot’ began to be appended to the names of my rendered image files when using the batch rendering function. I don’t know who wants this or asked for this, but I liked it much better when I had complete control of my own file naming conventions. Is this a setting that I can turn off? I’m not sure if this is a V-Ray thing or a Rhino thing, so apologies if this is the wrong place.