You can hide your important file into an image file. To do this you need any zip software. To hide follow those steps:
1. Zipped your important file and put it in an empty folder.
2. Copy an image file and put it in same folder.
3. Open command prompt and go to the folder.
4. Type following code
“Copy /b Image_name+zipfile_name newfilename” (Ex:copy /b image3.jpg+work.zip new.jpg)
5. Press enter.
A new image will create with name new at the same folder. Now delete the original file. If you open this file, you see only the image. To open your important file opens the image with zip software.