Hide a compressed archive in a jpg (Stenography without tools)

Here is how:

here is the command text: copy /b image.jpg + rarfile.rar endresultpicture.jpg

1. copy and paste that into cmd, and replace the "image.jpg", and the "rarfile.rar" with the path of each. make sure to put quotes around the path if it has spaces!

2. Then, the "endresultpicture.jpg"'s extension can be changed to .rar, and then opened with winrar!

Then the picture can be opened normally without any indication that there is something else inside the file (except the abnormally increased filesize) try it!

Tip: it can be a method to pass around pirated content

Some proof of this method:
here is a link to the file that I did it on. Change the extension of the jpg file to .rar. Then open it with winrar. Cool huh? The file inside is a text file with the cmd text that does this.

Link to the file: http://www.megaupload.com/?d=ZNZLM2I1

Thanks to hhbhagat1417 for writing this.