Are you sure about that?
yes.

Whatever you do in Office Applications can be hacked by some who knows how
to. We try to hide and protect anything from "normal" users as good as
possible knowing that there's always a way to crack the file, if you have
access to the folder, access to the PC, access to the server, access to the
building.

Office applications are not secure, so do not use them ;)

arno