TeraCopy Pro will give you a list of files that are over 255 characters. Bear in mind that this overload can be caused by the amount of folders the files may be nested in so it is not always the actual filename. Teracopy Pro, unlike the system copy/move function, will not stop this function but will carry on and at the end of the process will list the problem files with a red x to enable you to track and manually process them.