Image conversion - thumbnails

I have been using image conversion to create thumbnails. Not done one for a short while but now notice it is adding ' - copy' to the end of the image created. How can I stop it doing this as the file created is renamed from the original file name.

How are you performing the conversion?

Which version of Opus are you using?

sorry, I noticed there was a hidden file named folder - problem resolved, sorry to have bothered you