The best way to protect the content of a folder is to hide it. For this Hide my files has been specifically created. It is a utility that lets you hide the files and folders you indicate. Thus no-one can access them because they are invisible to all other users.
Not even by using the general Windows searcher will they access these hidden files, as they don`t enter in the results list.
To view them again, and edit them, just write the corresponding password into Hide my files, and they will reappear to be used.