A family of Microsoft word processing software products for creating web, email, and print documents.
Go to Word and Excel Preferences... and then click the Save option. One of the save choices is to "Always create a backup" and if this setting is marked, that is what is creating the extra folders.
I am surprised though that you say these are empty because that is where a previous version of your file should be every time you click save. This feature is really an overwrite protection feature, versus a backup of exactly what your current saved file looks like. It's there incase you click save and then realize that you overwrote some stuff you didn't want to destroy... so you can go back to this last version.
If you do want this kind of file overwrite protection, only better and with no "permission" problems... download my free Got-Ur-Back add-in. You can then turn off the embedded default setting for "Always create a backup" and use the Got-Ur_Back approach.
Hope this helps