How to Preview Image or PDF file without using mouse using Short cut keys?

To preview any picture or any PDF file you’ve to go for option ‘Photo preview’ or ‘File preview’. To get rid of this and by using simple commands on your desktop or Laptop makes you easy. If you’re using Windows 7 OS on your Laptop or Desktop then it’s very easy to implement this trick to preview photos, pdf files. Just select that item and press ‘Alt + P’ shot cut key to preview any image or pdf file easily.