Hello . something in and out Topic... I use a soft to rename hundred of files in a sequential process, for pieces of drawing animations for example. Graphic Converter 3.9, on Mac Intosh, I hope it runs under Windows too. It's a graphical soft, very famous and shareware with a little fee to obtain full functions. You can process the renaming functions on any kind of files (datas). Using it , you can rename for example : sound_piano01.wav to sound-piano01.wav and do it for thousand instances in one click. Just try it. And let me know in private mail if it's ok ? Try www.versiontracker.com to download the last version. GraphicConverter is the exact spelling, may be case sensitive. Eric LE GUEN ericleguen@...