There is a trick in windows which gives you the opportunity to hide any type of files in a JPG file.
This simple trick can be achieved in few steps:
Select the files you want to hide and compress them using winrar,winzip etc...
Drag the compressed file and a random picture in the same directory(eg. C:\)
Go to Start-->Run and type cmd in order to open the command promt window
Go to directory where you have placed the files (type cd.. twice to go to C:\)
Type:
COPY /B "name".jpg + "name".zip "new name".jpg


After that process a new jpg file will be crated in C:\ with the name: new name.
If you double click you will see just the image,but if you right click to the file and select extract,your fidden files will be extracted.