Show The Inside Of A Vigina How Do You Add An Explorer Thumbnail To A File, To Show The Contents Inside The File?

How do you add an explorer thumbnail to a file, to show the contents inside the file? - show the inside of a vigina

I would like to preview in browser to display the contents of a file in the file. It's like, do what the PDF, BMP, PNG, GIF, and all other formats too. The thumbnail is displayed in Windows Explorer, if the files are in thumbnail view.

Not that I am to change the icon for my file, but the small images. If I change the icon, all file types is the image itself. I want to dynamically change the image that is about the content of the file. I think this can be done programmatically, but I do not know how.