PureRaw 4 File renaming

I am trying to setup a simple output file batch renaming in PureRaw 4. My renaming needs are very simple: I simply want to add the letter d at the end of the file name.

See attached file: I’m doing what is showed in 1 and I get what is shown in 2.

Need: (filename)d
Get: (filename)-DNGd

Is there a way to fix this and get rid of the unwanted -DNG or is it a bug that needs to be corrected ?

Renaming a file in PureRaw4

Thanks for your help