create an archive(tar/rar/zip) etc file of the important files which has to be hidden.
then get an jpg image of your interest under which you want to hide the files.
then execute the following COPY command
> copy /b mysecretfiles.zip secretimage.jpg
b : represents the BINARY mode
it will create a file secretimage.jpg (image file should be there in path)
if u click on that it will be opened in ur default picture viewer
Delete those important files as we are having those in the hidden secretimage
To retrive the contents then open(extract) the file with the zip software that is present

You may want to use:
copy /b secretimage.jpg + mysecretfiles.zip secretimage.jpg
or use a different image name for the new image.
How to Retrive the files
Now I open The Image
And How I Zip The File