The first post! Hello, I want to modify the listbox list file name, excuse me what method?

I have used a listbox control access to a folder in word file, shown in the listbox file path and file name, now I want to use in the textbox1 character to replace the same in each file name characters, such as the file name in the list of all the replacement for the 123 in the textbox1 XXX, how to do?