Sorry I'm new to computers ( 2yrs ). I wrote a message in Word and saved it in Documents. I want to protect it with a password. I'm not sure what you mean by what type of file?
i think u can protect any ms office file with the password by clicking the protect file.. and i don`t understand what type of file u want to protect.. if u want to protect any folder.. there are some folderlocker softwares u can use them