Found a very cool way to hide important files on your computer without using encryption or anything.
1. You put your file (i.e. online banking passwords or something) into a Rar archive (i.e. secret.rar).
2. Put a jpg image into the same directory (i.e. picture.jpg).
3. Open a command prompt and go to that directrory.
4. Now type 'copy /B picture.jpg + secret.rar picture.jpg'.
What you end up with is a file that looks and acts just like a jpg but the file size will be the sum of both files. To access to the Rar portion of this concatenated file you simply right click it and use the 'open with' option then choose WinRar and voila you can access your secret data. The only catch is, if you were to try to edit the jpg with a graphics application, you risk corrupting the Rar file it is attached to.