underscore

i need to replace undescore in a filename to whitespace. how can ido?
example:
david_guetta to david guetta
thanks dry.gif

see /t/967/1
instead of xyz enter the underscore.
the target field is _FILENAME

This question seems to be a double post....odd. I thought I'd answered it, and turns out it was previously asked (and answered) over in the General Discussion area.

thanks for your suport i resolve this dude