same file copying-no to all

Imagine you have two folders, with say MP3 files, and you want to copy all MP3 files from one of the folders to the other, but you do not want to copy those you already have (files with the same name.extension). So what you do is select all files, copy them and paste them in the other folder. But then a window pops up saying you already have xxxxxx.mp3 file and asks you for permission to overwrite the file. You have only 4 options - Yes, Yes to all, No and Cancel. If you click No (that's what you want), you'll get the same message for the next conflict... and for the next and so on. If only you had 5th button with title No to all... well you have, you just don't know it exists - hold down Shift while clicking No on that dialog window and it'll never ask you again for this file transfer Works perfect in XP. Never tested on previous versions of Windows. Vista and up has such an option.