Win Explorer: how to have html or txt thumbnails preview, as with img?

Hi,

I find convenient to have the first page of a text or html file in a thumbnail preview, just as with images.
How I can get this under win10?

Some config parameters or addon???

Thanks

Thanks this I knew.

What I wish is displaying at once all html or txt files as thumbnails.

I know this thread is old, but it is still on the second page of Google Search with the keywords I used... so it is still relevant. I hope this helps!

.NET Shell Extensions - Shell Thumbnail Handlers
.NET Shell Extensions - Shell Thumbnail Handlers - CodeProject

Introduction

Shell Thumbnail Handlers (or as they're sometimes known, Shell Thumbnail Providers) are COM servers that you can write to customize the appearance of the thumbnail icons in the Windows Shell. We're familiar with many of these - for example, we expect to see a thumbnail of a jpeg file, but it turns out that making your own is quite straightforward, especially with a little help from the library SharpShell.

In this article, I'll show you how to write a Shell Thumbnail Handler for a Text File. This is a great starting point if you want to create your own shell thumbnail providers.