How to hide secret files in plain sight.

DOCX files were a thorn in the world's side for a few years, since Office 2007 users saved in that format by default while everyone else ignored their software updates, but they make hiding files super easy. Since DOCX files are just archives, you can easily unzip them, add your secret file, and then rezip with something like Hive Five winning 7-Zip. Office will give you an error if you try to open the document, but if its only purpose is to look inconspicuous, it doesn't really matter. You can just use a blank document with boring title and no one will be the wiser.

Link: http://www.tinkernut.com/archives/2094