The Markdown files use the *.md extension. You can open these files in Microsoft Word, Notepad++, and some other text editing software. But such tools do not show you the real-time preview of the Markdown file. This may lead to errors. There are many Markdown editor software available on the internet. These software show you the real-time preview of the Markdown document and provides many other features. We have mentioned such tools in this post that you can try.