This is a piece of software that takes a target file and an input file, it will then combine the input file into the target file. This is usefull because if you combine a .zip file into a .jpg file you will be able to upload the .jpg file to an image hosting service such as imageshack and then some one else can download the .jpg and then open it using winrar and the .jpg file will open like a normal .zip revealing all of your hidden files.

There are endless possibilities, that was just one.

The program also allows your to specify an optional password so that no one can access the file you have combined unless they know your password.