In this Instructable, I will show you how to hide files inside a picture file. They are almost undetectable, and can be made very hard to get.
You will need these things:
1) A picture to hide stuff in
2) Files to be hidden
3) A file compression software (I use 7-zip, which you can get here
4) Command PromptUPDATE
You can not only hide files in pictures, but music files, videos, and just about anything else.