Filename Extention

I just wanted to rename one of my instruments but I forgot to write the filename-extention behind it.
Instead of writing ‘instrument.rni’ I wrote ‘instrument’ and suddenly I couldn’t find it anymore.
Since it’s clear that you are renaming an instrument, it would be nice if Renoise could attach the *.rni (and .wav for sample and .rns for song) behind the new filename.
It’s not one of those important ideas, but it’s nice if Renoise also cares about the lazy composers :)