Here is a small Windows Explorer tip. How many times have you copied or moved files and got the dialog box Confirm File Replace saying "This folder already contains a file named 'whatever.ext'." and asking if you "Would like to replace the existing file" "with this one?"?
Now you want to say No for all the rest of the files for some reason. If you have many files it can take a while and you don't want to wait for the process to be interrupted by this dialog box.
The tip in this case is to hold down the Shift key on the keyboard and press No. That way no existing files will be replaced.